MA247(MR) Manual Web
User Manual:
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MA247 series
Instruction manual
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Instruction manualMA247 series 1
MA247 series
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2MIXING AMPLIFIERS
Safety First !
• Caution: hot and sharp surfaces! This professional device needs
to be installed by qualified personnel only.
• Please check the packing for any kind of damage upon
reception of the goods. If the packing is damaged, please
contact your dealer before opening it.
• !!!! Danger!!!! Exposure to high sound pressure levels may
cause permanent hearing loss. Hearing loss induced by
exposure to high sound pressure levels will vary from individual
to individual, but nearly everyone will lose some hearing
when exposed for a sufficient amount of time. Therefore it is
recommended that all persons exposed to equipment capable
of producing high sound pressure levels, such as this amplifier,
wear sufficient ear protection while installing or operating this
unit.
• Read all documentation before operating your equipment.
• Keep all documentation for future reference.
• Keep the carton and packing material, even if the equipment
has arrived in good condition.
• Should you ever need to send the unit back, use only the
original factory packing.
• Do not spill water or other liquids on or into the unit.
• Make sure power outlets conform to the power requirements
listed on the back of the unit.
• Do not use the unit if the electrical power cord is damaged.
• Always operate the unit with the AC ground wire connected to
the electrical system ground.
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Instruction manualMA247 series 3
• Turn the level controls on the amplifiers all the way down
during power-up to prevent speaker damage if there are high
signal levels at the inputs.
• Do not connect the inputs / outputs of amplifiers or consoles
to any other Voltage source, such as batteries, mains sources or
power supplies, regardless of whether the amplifier or console
is turned ON or OFF.
• Power down and disconnect units from mains Voltage before
making connections.
• Do not use the unit near stoves, heat registers, radiators, or
other heat producing devices.
• Do not operate equipment on a surface or in an environment
which may distort the normal flow of air around the unit. If the
unit is used in an extremely dusty or smoky environment, the
unit should regularly be “blown free” of dust.
• Do not remove the cover. Removing the cover will expose you
to potentially dangerous Volt-ages.
• Do not drive the inputs with a signal level higher than that
which is required to drive equipment to full output.
• Do not run the output of any amplifier back into another input.
• In case of malfunction, this device should be serviced by
qualified service personnel only.
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4MIXING AMPLIFIERS
Features
The MA247 sets a new standard as a professional 6 zone PA
mixing amplifier/preamplifier for commercial and industrial
applications, either as a standalone unit or as the central device in
an expandable, simple but clever paging system. The amplifier is
equipped with 4 balanced mic/line inputs, each with adjustable gain
and tone controls, up to 4 line level inputs and an emergency input.
The MA247 has a six level priority system. The emergency/
telephone input has the highest priority and is activated by a
switch or vox circuitry. Its signal goes directly to the main amplifier,
bypassing any level control accessible at the front of the unit. An
attenuator next to the input sets its level. Micro¬phone input 1 has
the second priority level, followed by the mic 2, 3 and 4 and finally
the line signals (music).
Zones 2 to 6 can be volume controlled individually. Please note
that zones number 5 and 6 are 70 Volt outputs, these are
compatible with 100 Volt speakers, but by nature, these outputs
will have a slightly reduced output level, meant for the ‘quiet’
zones in a multizone system. For even more flexibility, zone 1 is an
independent zone with a separate line level output, which turns
the MA247 into a true 2 zone mixing amplifier with integrated
preamplifier. During paging, the corresponding integrated volume
control will be automatically bypassed. When priority has been
activated in any zone, the internal 24VDC supply output (max
0.6A) can activate priority relays of loudspeaker attenuators or
other devices. There is a dedicated 24V output per zone! Even an
emergency 24 VDC supply input is present on the unit. The supply
will automatically keep the amplifier powered when mains power is
interrupted. Mic input 1 is optimized to be used with our MICPAT-6,
a selective paging station 6 zone microphone.
This mic is the master mic. Maximum 5 of these mics can
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Instruction manualMA247 series 5
be switched in parallel on this single input! Mic input 2 - 4
are designed to be used with our MICPAT-2 (2 zone groups)
microphone or any other microphone depending on the application.
On the MA247 unit you can preset 2 paging groups to be paged
with mic 2 – 4. Please note that it is not possible to connect
multiple MICPAT-2 mics
to the same input.
That’s not all. If you are a professional installer, you will appreciate
the possibility to use an external amplifier as paging amplifier.
Why? Suppose zones 2 and 3 should not receive paging messages,
meaning there should always be background music. Then you can
use an external amplifier for all paging tasks. MA247 does all the
switching and thinking for you. The internal amplifier will be used
for background music. When a paging message is sent to other
zones than zone 2 and 3, zone 2 and 3 will stay connected to the
internal amplifier and will continue to play the music. All other
zones will hear the paging message: the MA247 will disconnect
these zones from the internal amplifier and will send the paging
signal to the external amplifier. The external amplifier will feed
the signal to the selected zones via the MA247. When paging
is finished, the zones will automatically be switched back to the
internal amplifier. We will show an example of such application in
this manual. We will use a 2 channel PA2240BP amplifier and a
MA247 in an application that would normally use at least twice as
much units to do all the switching and signal routing.
A unique new switching circuit design has been applied to ensure
trouble-free switching for many years.
Removable 19” brackets are delivered as a standard accessory along
with your amplifier.
The MA247 complies with the CE standards.
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6MIXING AMPLIFIERS
Operation
Front panel MA247
1. Zone 1 output level: this level control sets the output level to
the zone 1 preamp output.
2. Zone 1 paging LED: this LED lights up when zone 1 is being
paged.
3. Zone 1 music selector: selects the line level input for zone 1.
4. Zone 2 paging LED: this LED lights up when zone 2 is being
paged.
5. Zone 2 level control: this control is used to preset the zone 2
level relative to the master level.
6. Zone 3 paging LED: this LED lights up when zone 3 is being
paged.
7. Zone 3 level control: this control is used to preset the zone 3
level relative to the master level.
1
2 4 6 8 10
11
12
13 14
2423222120
19
18171615
3 5 7 9
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Instruction manualMA247 series 7
8. Zone 4 paging LED: this LED lights up when zone 4 is being
paged.
9. Zone 4 level control: this control is used to preset the zone 4
level relative to the master level.
10. Zone 5 paging LED: this LED lights up when zone 5 is being
paged.
11. Zone 5 level control: this control is used to preset the zone 5
level relative to the master level.
12. Zone 6 paging LED: this LED lights up when zone 6 is being
paged.
13. Zone 6 level control: this control is used to preset the zone 6
level relative to the master level.
14. Level indicators/clip-limit: The protect LED lights up for a few
seconds during start-up, or when an error occurs, such as
overheating or overload. The lower green on LED will light up
to indicate that power is present. The signal LED indicates that
a strong signal is sent to the power amplifier. To work within
normal conditions, the vol¬ume indicator should be kept under
0dB (100%). At -2,5dB a
limiter will be activated. This red LED indicates that the “auto
gain circuit” keeps the level below clipping. This is NOT a clip
indicator, but an indication of the “automatic gain control”. Set
your max levels so that the limiter LED never lights up!
15. Zone 2 – 6 music selector: selects the line level input for zones
2 - 6.
16. Music bass tone control.
17. Music treble tone control.
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8MIXING AMPLIFIERS
18. Music level control: turn this level knob to adjust the music level
relative to the microphone signals.
19. Music muted by priority LED: this red LED lights up when the
music is muted by any priority signal or priority contact. When
this LED lights up, there are 24 VDC outputs available on the
rear connector. 1 output for every zone, capable of supplying
0.3A per zone with a maximum of 0.6A for all zones together.
20. Mic/Line 2 level control: turn this knob to adjust the mic/line 2
level relative to other signals.
21. Mic/Line 3 level control: turn this knob to adjust the mic/line 3
level relative to other signals.
22. Mic/Line 4 level control: turn this knob to adjust the mic/line 4
level relative to other signals.
23. Master level control: turn this knob to set the global mix level in
zones 2 – 6. This control will be bypassed when the emergency
input is activated.
24. Power switch: switch mains power on and off. This switch
turns off the amplifier when connected to the mains AC supply.
Please note that this switch does not switch the amplifier off
when operating from a 24 VDC emergency power supply.
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Instruction manualMA247 series 9
Important information
• Zone 2 - 6 level controls are used to preset levels in different
zones relative to the master level and to switch off certain
zones temporarily. Zone 5 and 6 outputs are 70 Volt outputs,
these are fully compatible with 100 Volt speakers but will
produce a maximum output level about 3 dB lower than
normal 100 Volt lines. Use these outputs in the most silent
zones. When using an external paging amplifier, all speaker
outputs from the selected zones are switched to maximum
volume (100 Volt) during paging. In other words: the zone
volume controls from zone 2-6 are bypassed during paging.
• A maximum of 180 Watts speaker load is allowed per zone,
with a total maximum of 240 Watts for all zones when using
the internal MA247 power amplifier only. Do not overload
the amplifier. If the amplifier is overloaded, it will result in
overheating. Check your total speaker load with an impedance
or Wattmeter before operating the amplifier. Minimum total
speaker impedance (all zones combined) is calculated like
this (100 V x 100 V) / 240 W = 41.66 Ohms. Please note that
impedance can NOT be measured with a normal multimeter,
you need a special impedance meter or 100 Volt line
Wattmeter for this purpose. If you need more speakers and/or
more power, then you should use an external power amplifier.
The MA247 has an independent preamplifier circuit for zone 1,
and a combined pre-out/amp-in connector for all other zones,
allowing you to increase the total output power without the
need of a supplementary preamplifier.
• Please note that in some cases the music level in non-pageable
zones can slightly vary during paging. When you use an
external paging amplifier, the internal power amplifier will
‘see’ fewer speakers at its output, because these speakers are
switched to the external amplifier’s output during paging. This
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10 MIXING AMPLIFIERS
can result in music levels varying, depending on the speaker
load variation. This is not a malfunction. This effect will increase
depending on the speaker load variation. You can avoid such
situations by powering the sensitive zones with an external
amplifier connected to zone 1 line level output.
Front & Rear panel MA247MR
• Music selector 3 and 15 have 2 aux source inputs + internal
tuner and MP3 player section (MA247 has 4 aux source
inputs).
• On the left side of the front panel you will find a digital tuner
and the MP3 player. Operation of the tuner and MP3 player
will be explained later.
• Difference in MA247MR rear panel layout:
• Aux 3 & 4 mono input (26) have been replaced by a rec out and
tuner output bus.
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Instruction manualMA247 series 11
Tuner operation
• Antenna connector (17) for AM wire antenna and FM antenna
coax connector.
• Please note that you must use a HF ground isolation
transformer when connecting the FM antenna input to an
active antenna or cable network!
1. Display section: shows various tuner parameters such as
frequency band (FM or AM), selected frequency and preset
number. The tuner has 10 AM and 10 FM preset memory
locations.
2. FM/AM selector: press to switch between FM or AM band.
3. Scan down: press shortly to scroll one step down in the
frequency band (9 kHz AM, 50 or 100 kHz FM). Press for
about a second to search for the next radio station down the
frequency band.
4. Scan up: press shortly to scroll one step up in the frequency
band (9 kHz AM, 50 or 100 kHz FM). Press for about a second
to search for the next radio station up the frequency band.
1 2
87
3
9
4
10 11 12
5 6
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12 MIXING AMPLIFIERS
5. Scan button: press to scan all memory locations: the tuner
automatically selects the next memory location every 3 seconds.
After a full scan, the tuner resumes to normal operation. You can
interrupt the scan cycle by pressing the scan button during the
memory scan.
6. Save button: press this button, followed by a numeric button
(1 to 5, 5+) to store a preset in the internal memory. E.g., you want
to store the currently selected station in memory location number
1: press the save button, followed by the numeric 1 button. If you
want to save in locations 6 to 10: press the save button first, then
the +5 button followed by a numeric button 1 to 5 -> preset 6 =
button +5 followed by button 1…
7. Numeric button 1: press to select or save preset 1
8. Numeric button 2: press to select or save preset 2
9. Numeric button 3: press to select or save preset 3
10. Numeric button 4: press to select or save preset 4
11. Numeric button 5: press to select or save preset 5
12. Numeric button +5: press this button first to select or save
preset stations 6 to 10, followed by a numeric button 1 to 5.
Alternatively, during manual frequency scan, you can press this
button to select a half frequency step, e.g. FM steps are 100
kHz by default, press the +5 button to step up 50 kHz in the FM
band.
Note: after powering on the MA247/MA247MR main unit,
the tuner is automatically powered on. The tuner cannot be
powered off separately.
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Instruction manualMA247 series 13
MP3 operation
1. Display section: shows various parameters such as track
number, folder number (if present), elapsed track time, MP3
mode…
2. Repeat: press this button to alternate between repeat 1 (repeat
one track), repeat folder or repeat all. Repeat mode is shown in
the display.
3. Shuffle: press once to activate the shuffle function. The unit will
play a randomly selected track. To exit shuffle mode, press the
button once again. Shuffle mode is shown in the display.
4. Folder <<: press this button to select the previous folder. This
button has no function when no folders are present on the
media (USB stick or SD/MMC CARD slot).
5. Folder >>: press this button to select the next folder. This
button has no function when no folders are present on the
media (USB stick or SD/MMC CARD slot).
1 234567
10 11 12 13 14 15
98
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14 MIXING AMPLIFIERS
6. Track <<: press once (shortly) to select the previous track, keep
pushing to search backward in the track currently playing.
7. Track >>: press once (shortly) to select the next track, keep
pushing to search forward in the track currently playing.
8. USB slot: insert your USB memory stick here. Please note that
an external USB hard disk will most likely not work on this slot.
File system recognized is FAT32, maximum memory size is up
to 32 gigabytes. Some USB sticks don’t allow direct memory
access. These will not work on the MA247MR.
9. MMC /SD card slot: push in the card gently, metal contacts first,
pointing down. Push the card in until you hear a click. Push the
card again to eject. File system recognized is FAT32, maximum
memory size is up to 32 gigabytes.
10. Select USB-CARD: press this button to select USB or memory
card operation.
11. Prog button: press this button to enter program mode. Press a
second time to quit program mode, or press STOP to clear all
program steps. Programs are not memorized after powering
on and off. If you enter program mode, PROGRAM is displayed
in the display, the numeric characters show folder number,
track number and program step number. Enter program mode,
select a folder and track and press shuffle to enter the selected
folder/track. The last characters show the program step. Select
another folder/track and press shuffle to confirm the program
step. When you press shuffle twice, the selected track will
be played twice… After programming all steps, press play to
start playing the program. In order to clear the program, press
program or stop to clear the program steps. Programs cannot
be stored or recalled after cycling the power.
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Instruction manualMA247 series 15
12. Mute button: press once to mute the MP3 player, press again
to unmute.
13. Play /pause: press to start playback, press again to pause
playback.
14. Stop: press to stop playback.
15. Power button: press to power on or off the MP3 player.
The USB and CARD reader will only read MP3 files. ID3 tag and
folder names are not displayed.
For maximum compatibility, avoid media containing other than the
supported file types.
When a medium is inserted while another medium is playing,
playback will be interrupted.
Not all media are compatible with the media player. Media must be
formatted in FAT32 file system only.
All memory locations on the media must be accessible. Hidden
files and folders, autorun executables or other types of software
necessary for accessing the memory will cause malfunction of
the media player, causing dropouts during playback, unexpected
skipping of files or no functionality at all. In such cases, remove the
media and try media from other manufacturers. Files present on
the media with file extensions other than MP3 may cause erratic
behavior of the media player and should always be avoided.
USB hard disks will most likely not work on the media player’s USB
Notes about media compatibility
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16 MIXING AMPLIFIERS
Rear panel
1 3 5 10 12
2 4 6 7 8 9 11 13 14 15 16 17
18 34 19 21 23 25 27 2 9 30 31 32 33
20 22 24 26 28
1. Loudspeaker output connector zone 6: zone 6 is a 70 Volt
speaker line output compatible with 100 Volt speaker lines.
Com = speaker ground, 70 V = speaker plus connection. If this
zone is selected for paging, it will become a normal 100 Volt
line. Use this output for your ‘silent’ zones.
2. Loudspeaker output connector zone 5: zone 5 is a 70 Volt
speaker line output compatible with 100 Volt speaker lines.
Com = speaker ground, 70 V = speaker plus connection. If this
zone is selected for paging, it will become a normal 100 Volt
port for many reasons: the file system is not FAT32, the memory
size exceeds the maximum specifications and the USB port’s supply
current is insufficient to power the hard drive.
Due to FAT32 file system limitations, maximum file size is limited to
4 Gb.
Depending on the reading speed of the media, excessive file
fragmentation may cause erratic behavior of the media player.
Usually, reformatting the media and rewriting the files will solve this
problem.
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Instruction manualMA247 series 17
line. Use this output for your ‘silent’ zones.
3. Loudspeaker output connector zone 4: zone 4 is a 100 Volt
speaker line output compatible with 100 Volt speaker lines.
Com = speaker ground, 100 V = speaker plus connection.
4. Loudspeaker output connector zone 3: zone 3 is a 100 Volt
speaker line output compatible with 100 Volt speaker lines.
Com = speaker ground, 100 V = speaker plus connection.
5. Loudspeaker output connector zone 2: zone 2 is a 100 Volt
speaker line output compatible with 100 Volt speaker lines.
Com = speaker ground, 100 V = speaker plus connection.
6. Zone 1 balanced line level output: this is the line level output
for zone 1. Connect your external amplifier here.
7. Emergency input with priority contact: the emergency input
has highest priority. The emergency level can be set with knob
‘8’ only and bypasses ALL other level controls. The emergency
signal is also present on the preamp out connectors. You can
activate the emergency input by closing a contact between the
GND and prior connections, or alternatively, activate the input
by setting the automatic vox circuitry. Set the internal jumper
marked ‘S3’ to the vox position and set the threshold level with
VR13. The jumper and level adjustment are located inside the
unit on the rear PCB. In order to reach them you will need to
open the unit. For authorized persons only.
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18 MIXING AMPLIFIERS
8. Emergency input level: this is the only level control on the
emergency input. The emergency signal bypasses all possible
level controls in the MA247 unit.
9. Chime level: turn this knob to set the level of the two tone
chime. The chime is activated by the priority switches from mic/
line 1 – 4. Please note that the emergency input switch or vox
circuitry does not activate the chime.
10. Paging group 1 dipswitches: click the dipswitches to the ON
position for zone 1 to 6 to enable zone 1 to 6 zone group
paging with mic 2-4. Connect the GND and PG1 (paging group)
connector on mic 2, 3 or 4 to the microphone paging switch.
This will enable zone group 1 paging (e.g.using our MICPAT-2
unit). The dipswitch settings are valid for mic 2 – 4 inputs only.
Mic 1 is a higher priority mic and overrides these settings.
11. Paging group 2 dipswitches: click the dipswitches to the ON
position for zone 1 to 6 to enable zone 1 to 6 zone group
paging with mic 2-4. Connect the GND and PG2 (paging group)
LEVEL
ADJUSTMENT
PRIORITY
SWITCH / VOX
SLECTION
JUMPER
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Instruction manualMA247 series 19
connector on mic 2, 3 or 4 to the microphone paging switch.
This will enable zone group 2 paging (e.g.using our MICPAT-2
unit). The dipswitch settings are valid for mic 2 – 4 inputs only.
Mic 1 is a higher priority mic and overrides these settings.
12. Selective paging connector on RJ45: connect the MICPAT-6
RJ45 connector to this connector for selective zone paging. This
is not a LAN or computer network connector, so NEVER connect
this to any other network. Connection details:
Orange white cable: zone 1 – pin 1
Orange cable: zone 2 – pin 2
Green white cable: zone 3 – pin 3
Blue cable: zone 4 – pin 4
Blue white cable: zone 5 – pin 5
Green cable: zone 6 – pin 6
Brown white cable: GND – pin 7
Brown cable: +24V – pin 8
13. Mic 1 level, tone adjustment: adjust the mic 1 level and tone
here. For use with MICPAT-6, set the mic/line pushbutton to the
line position.
14. Mic/line 2: this mic has lower priority than mic 1; see below for
details.
15. Mic/line 3: this mic has lower priority than mic 2; see below for
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20 MIXING AMPLIFIERS
details.
16. Mic/line 4: this mic has lower priority than mic 3; see below for
details.
17. Antenna inputs, MA247/MR only: connect an AM wire frame
antenna on the push spring connectors and/or a suitable FM
antenna on the coaxial connector. ALWAYS use a HF ground
isolator transformer when connected to a cable network or
active FM antenna!
18. Mains socket: connect the included mains power cord here.
The mains fuse is also located inside the socket. Replace it if
necessary with an identical fuse only.
19. Backup power input: connect the 24 VDC backup power here.
In case the mains Voltage is interrupted, the backup power
will automatically keep the unit operational. Please note that
maximum output power of the internal power amplifier is
limited when operating on the emergency supply. 24V supply
current is 20A max.
20. Priority output: 24 VDC is present on this connector when
priority is activated. You can use the 24 VDC to switch local
volume controllers relays. Warning, maximum 0.6 A!!! Do
not exceed maximum output current, do not short-circuit this
output and do not apply any foreign Voltage to this output!
This is the general 24V output, active when priority is activated
in any zone. There are dedicated priority outputs per zone
available on connector ‘34’.
21. Direct speaker outputs: This is the direct amplifier output,
available in 100V, 70V and low impedance. For normal
operation, leave the 100V wire bridge between ‘21’ and ‘22’
in place. The wire bridge connects the internal amplifier’s
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Instruction manualMA247 series 21
output to the integrated volume control and speaker switching
circuitry. When a separate paging amplifier is in use, this
wire bridge MUST be removed. Never use the 4 Ohm output
together with any 50V, 70V, 100V or zone output.
Wire bridge in case of standalone use. Remove when using an
external paging amplifier.
22. External paging amp in: connect the 100V output from an
external 500 Watt max paging amplifier here. This is useful in
situations where you want to separate certain zones from each
other, e.g. some zones will need music only, and other zones
will need paging and music. The external amplifier will take
care of the power amplification of the paging messages. The
MA247 takes care of all switching and signal processing.
EXPERT TIP:
You may wonder why the external amplifier can be more than 240
Watts. Suppose you have a lot of speakers connected to zone 5 and
6, these are the 70 Volts zones by default. When powered by the
internal MA247 amp, the load on the internal amplifier is only half
of the power compared to the power in 100 Volt. When you switch
these zones to the external paging amplifier, these silent zones will
become 100 Volt zones, meaning that the external amplifier will see
double the power compared to the internal amplifier.
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22 MIXING AMPLIFIERS
23. External paging amp pre out: the line level signal for the
external paging amp is present on this balanced euroblock.
24. Paging mode switch: When pushed in, you can use an external
paging amplifier. The external amplifier takes care of the paging
messages. When not pushed in, all signals are amplified by the
MA247 internal amplifier only. As a consequence, in standalone
use (switch not pushed in), music will be muted whenever a
paging message is sent. Please note that the wire bridge MUST
be present in standalone applications in order to hear paging
messages.
25. Power amp in – pre out: here you can connect an external
signal processor, e.g. an equalizer. In all other cases, leave the
signal bridge in place or there will be no output from the power
amplifier. You can use a Y connector here to feed the line signal
to an external device.
26. Aux 3 – aux 4 inputs: mono inputs aux 3 and aux 4: MA247
only. Tuner out – rec out connector: MA247MR only.
27. Aux 2: aux 2 stereo input, stereo signals are internally mixed to
mono. Monosignals can be applied to the left and/or right input
connector.
28. Aux 1: aux 1 stereo input, stereo signals are internally mixed to
mono. Monosignals can be applied to the left and/or right input
connector.
29. Paging mic 1: input for mic 1 on balanced euroblock. Both mic
and line levels are supported. For operation with Micpat-6,
switch to line level operation with the mic/line selector switch,
located above the euroblock. This mic has priority level 2.
30. mic/line 2 input, this mic has priority level 3, for details about
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Instruction manualMA247 series 23
the mic channel strip, see below.
31. mic/line 3 input, this mic has priority level 4, for details about
the mic channel strip, see below.
32. mic/line 4 input, this mic has priority level 5, for details about
the mic channel strip, see below.
33. GND screw.
34. Zone 1 – 6 priority outputs: these are the individual zone
priority outputs: 24 VDC is present on these connectors when
priority is activated in zone 1 – 6. You can use the 24 VDC
to switch local volume controllers relays. Warning, maximum
current per zone is 0.3 A, maximum total current for all zones
is 0.6A!!! Do not exceed maximum output current, do not
short-circuit this output and do not apply any foreign Voltage
to this output!
Use the 24VDC supply for priority purposes only. A general
priority output is available on connector (20).
35. Fan section: the internal cooling fan operates when the
amplifier’s temperature rises above 55°C. Keep this area clear
of any cables and foreign objects and clean the interior of the
amplifier once per year to avoid overheating due to excessive
dust.
Note: the fan is a mechanical device and the area around it
needs to be kept clean at all times. If the unit is used in a dusty
environment, regularly clean the entire amplifier with clean
and dry compressed air. Dust may collect inside the unit and
prevent proper cooling, causing overheating, eventually causing
malfunction. Replace the fan if necessary. Failures caused by
improper maintenance are not covered by warranty.
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24 MIXING AMPLIFIERS
Microphone connections
• Status dipswitches: set to *
when using a microphone
with a push button(s)
connected to the paging
contact(s). Set to mix when
you want the speech to be
mixed with the music: this
is useful for mics without
pushbuttons or switches.
• Phantom power: set to on
if your microphone needs
phantom power
(such as condenser mics).
Voltage supplied is 18 VDC.
• Signal input: balanced input
on euroblock.
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Instruction manualMA247 series 25
Unbalanced mic/line signal connection
Unbalanced mic/line signal connection
1)
3)
2)
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26 MIXING AMPLIFIERS
1) This connector accepts balanced and unbalanced mic/line signals.
For use with unbalanced mics or line level signals, connect the
source GND to both GND and -, connect the unbalanced hot
wire to +. This can be useful when connecting the receiver
output from a wireless microphone.
2) Alternatively, you can connect the unbalanced signal ground to
the – connector and the ‘hot’ wire to the + connector. By not
connecting the ground connection, you can avoid a lot of ground
loop problems (such as hum, excessive noise…)
3) Standard connection method for balanced mic/line signals.
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Instruction manualMA247 series 27
• Paging switch connector: for selecting paging group 1 or
paging group 2. MIC1 will always override the paging group
preselection.
• Paging group 1: connect GND to PG1 using a switch. Do not
apply external Voltages to these contacts.
• Paging group 2: connect GND to PG2 using a switch. Do not
apply external Voltages to these contacts.
• Note: MICPAT-2 is equipped with 2 switches for paging 2 zone
groups and can be connected to the euroblock connector.
• The mic /line inputs all have different priority levels according to
the table below:
1
6 PRIORITY LEVELS
4
2
5
3
6
EMERGENCY
PAGING 1
MIC / LINE 2
MIC / LINE 3
MIC / LINE 4
MUSIC INPUTS
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28 MIXING AMPLIFIERS
MICPAT-6 Connection
MICPAT-2 Connection
• MICPAT-6 must be connected to the PAGING
INPUT 1: connect the RJ45 plug to the
selective paging station RJ45 connector.
The second wire, the one with the blank
leads must be connected to the SGL input
euroblock: screen (black) to GND, white to -,
red to +. The MIC1 level can be set using the
controls on the rear only. You can connect up
to 5 pieces MICPAT-6 units to this input. Use
one or more RJ45 split units to connect the
RJ45 connectors from the mics to the RJ45
connector. The SGL input of all MICPAT-6’s
must be connected in parallel on the SGL
input euroblock.
• MICPAT-2 (or other paging mic) can be
connected to MIC/LINE 2 -4, depending on
the priority level required (see priority level
table). Connect red wire to +, white wire to
-, shield + yellow wire to GND, black wire to
PG1, blue wire to PG2. You can preset the
paging groups 1 and 2 using the dipswitches
at the rear of the MA247. The paging group
settings are equal for mic 2 to 4.
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Instruction manualMA247 series 29
Speaker zone connections
• Zone 1 amplifier connection (e.g. 480 Watts in zone 1):
Connect the signal output zone 1 (balanced, on euroblock)
to the external amplifier’s signal input, e.g. our PA2240BP in
bridge mode, providing 480 Watts into 100 Volt. Zone 1 has
independent line source selection and volume control.
• The benefit of the 70 Volt and 100 Volt output zones:
The 70 Volt outputs from zone 5 and 6 are fully compatible
with 100 Volt speakers. In silent zones, such as toilets or
showroom areas, the 100 Volt speakers usually play at very low
levels, even far below
70 Volt. However, when paging is needed in these zones, full
power at 100 Volt might be required.
Zone outputs 5-6 are specially designed for any application
where a clear (louder) speech paging is required above the
normal background music level. Zones 2-3-4 outputs are
standard 100 Volt for both speech and background music. Of
course, the level of BGM in each zone can be adjusted or even
switched off (paging only) by the zone level controls on the
front panel.
• Using an external paging and/or zone 1 amplifier:
The external paging amplifier must have at least the same
power as the internal MA247 amplifier. By connecting an
external paging amplifier, you have the possibility to create
independent zones with different sound levels with a very
simple setup. You can use our PA240P for this purpose, or even
the PA2240P-2 channel amp. The second PA2240P channel
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30 MIXING AMPLIFIERS
can be used as zone 1 amplifier, e.g. to power the speakers
in a warehouse or production facility, where music source and
level requirements are different from the other zones, such as
office areas, boardrooms, showrooms… Another possibility is
to use the PA240P as paging amplifier, and use the PA2240P in
bridge mode in zone 1, this offers you 480 Watts in zone 1. The
benefits are clear: less wiring, easy installation, flexible routing,
possibility to have zones with extremely high power demands
controlled by one central unit, the MA247.
• Zone connection examples:
Zone 1 = production facility and parking area: independent
source selection, 480 Watts from
PA2240BP in bridge mode, non-pageable.
Zone 2-4: office area, showroom and boardroom: from internal
amplifier, pageable.
Zone 5-6 (70 Volt outs): toilets, hallways: the most silent zones
in this case powered by the internal amplifier, non-pageable.
The external paging amp (e.g. PA240P or PA2240BP) takes
over the pageable zones, zone 2-4 in this case, while the other
zones continue to hear the music without interruption from the
paging messages.
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Instruction manualMA247 series 31
• Notes:
What about external volume controls? If you use additional
external volume controls, such as our E-VOL series, be sure
to connect the 24 Volt priority output from the MA247 to
the volume control’s 24 V priority input. This will bypass the
external volume controls, allowing paging messages to be
heard at full power. There is a general 24VDC output and also
an individual (per zone) 24VDC output available. Max current
supplied is 0.6A in total, with a limit of 0.3A for the individual
zone outputs.
As a general rule, a normal external volume control such as
our E-VOL series volume controllers consume about 50 mA
when priority is active. As a result, the MA247 can “feed”
a maximum of 12 external volume controllers (12 x 50mA =
0.6A), with a limit of 6 controllers per zone (6 x 50mA = 0.3A).
When third party external volume controllers are in use, please
check the supply current and polarity of the priority inputs!
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32 MIXING AMPLIFIERS
SETUP 5 zone individual
volume control with
priority bypass
6 zone operation with
independent zone 1
source selection
MA247(MR)
only
YES
Paging mode switch
not pressed in, wire
bridge in place (see
picture)
NO
Paging mode switch
not pressed in, wire
bridge in place (see
picture).
MA247(MR)
+ paging amp
YES
Paging mode switch
pressed in, wire
bridge removed.
NO
Paging mode switch
pressed in, wire
bridge removed.
MA247(MR)
+ zone 1 amp
YES
Paging mode switch
not pressed in, wire
bridge in place (see
picture).
YES
Paging mode switch
not pressed in, wire
bridge in place (see
picture).
MA247(MR)
+ paging amp
+ zone 1 amp
YES
Paging mode switch
pressed in, wire
bridge removed.
YES
Paging mode switch
pressed in, wire
bridge removed.
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Instruction manualMA247 series 33
selective paging
MICPAT-6: per zone selectable.
MICPAT-2: preset paging groups
using dipswitches for PG1 and/
or PG2.
selective paging without
background music interruption
MICPAT-6: per zone selectable.
MICPAT-2: preset paging groups
using dipswitches for PG1 and/
or PG2.
YES*
BGM will be interrupted in non-
paged zones.
Paging mode switch not pressed
in, wire bridge in place (see
picture).
NO
BGM will be interrupted in non-
paged zones.
Paging mode switch not pressed
in, wire bridge in place (see
picture).
YES
BGM will NOT be interrupted in
non-paged zones.
Paging mode switch pressed in,
wire bridge removed.
YES
BGM will NOT be interrupted in
non-paged zones.
Paging mode switch pressed in,
wire bridge removed.
YES*
BGM will be interrupted in non-
paged zones.
Paging mode switch not pressed
in, wire bridge in place (see
picture).
NO
BGM will be interrupted in non-
paged zones.
Paging mode switch not pressed
in, wire bridge in place (see
picture).
YES
BGM will NOT be interrupted in
non-paged zones.
Paging mode switch pressed in,
wire bridge removed.
YES
BGM will NOT be interrupted in
non-paged zones.
Paging mode switch pressed in,
wire bridge removed.
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34 MIXING AMPLIFIERS
*Selective paging without an external paging amplifier will cause
interruption of the BGM in the non-paged zones. In case a zone is
being paged, the MA247(MR) will bypass the internal zone level
control, causing the paging message to be heard at full level in
the selected zone(s). When external volume controllers are in use,
connect the 24V priority input of the controller to the dedicated
24V zone output of the MA247(MR).
If you want BGM and selective paging without music interruption
in the non-paged zones, please use an external paging amplifier
(PA240P, PA2240P, …)
• Practical wiring example when using the PA2240BP as
dedicated zone 2-6 paging amplifier and as ZONE1/240Watts
power amplifier: In this configuration, zone 1 selected sources
will always be amplified by the PA2240BP channel 2 amplifier.
Zone 2-6 selected music sources will be amplified by the
MA247 internal power amplifier. During paging, the zones that
must hear the paging messages are automatically disconnected
from the MA247 internal amplifier and will be switched to
the PA2240BP channel 1 amplifier. The internal MA247 power
amplifier will continue to play the music in the non-paged
zones.
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Instruction manualMA247 series 35
Zone 1 100Volt output
240 Watts maximum
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36 MIXING AMPLIFIERS
Technical Specifications
General specifications
Output power rating RMS 240 Watt
Frequency response 100 Volt out 40 - 25 kHz +1/-3dB
Total harmonic distortion <0,3% @ -6dB, 1kHz
Frequency response line output
zone 1
20 - 30 kHz +1/-3dB
Bass tone control zone 2-6 +8/- 8dB @ 100Hz
Treble tone control zone 2-6 +8/-8dB @ 10kHz
Tone control mic/line 1-4 from 100Hz/+3dB, 10kHz/-6dB to
100Hz/-9dB, 10kHz/+4dB
S/N ratio (20Hz-20kHz) amplifier in: >95dB
line in: >80dB
mic in: >65dB
Indicator LEDs zone paging : 6 x yellow LED
muted by priority : 1 x red LED
Limiter activity : 1 x red LED
Signal 100% : 1 x yellow LED
Signal -25dB : 1 x green LED
Power on : 1 x green LED
Protection active : 1 x red (also
lights up during power on)
Zone controls
Individual volume and source
selection for zone 1 line output
5 x 100 Volt volume controls for
zone 2-6
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Instruction manualMA247 series 37
Source controls Music selector zone 2-6
Music selector zone 1
music level control zone 2-6
mic/ line 2-4 volume control all
zones
Master level control zone 2-6
Master level control zone 1
Chime level control (back panel)
Emergency level control (back
panel)
Emergency vox on/off/level control:
setting inside the unit
Power supply 230VAC/50-60Hz MAX 800 VA
Mains fuse rating T6,3AL250V (inside mains
connector on back panel)
24VDC Emergency supply fuse T20AL250V (inside the unit)
Priority output fuse 0,6A resettable autofuse
Weight net MA247 - MA247MR 13,6 kg - 13,7 kg - 14,2 kg
Shipping weight MA247 -
MA247MR
15,5 kg – 15,6 kg – 16,1 kg
Dimensions 430(w) x 88 (h) x 360 (d) - 2 HE,
19” brackets included
Shipping dimensions 500 (w) x 175 (h) x 480 (d)
Operating temperature and
humidity
-10 to +45°C/up to 90% RH non-
condensing
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38 MIXING AMPLIFIERS
Outputs
Zone 1 Line level output, balanced 0 dB
on euroblock connector
Zone 2-6 100V outputs, zone 5 and 6 are
limited to 70V compatible with
100V speakers. MAX 240 Watt
total power in 100V (180 Watt max
in 1 zone).
Preselectable output levels: 5
steps + off + automatic bypass
(priority).
Minimum load impedance all
zones summed: 41,66 Ohms.
Zone 2-6 outputs on euroblock
connector, amplier power can be
supplied by internal or external
amplier (selectable with
paging mode switch at the back
panel)
Separate speaker out 50V/70V/100V and low impedance
on euroblock.
Rec out 1V
Tuner out (MA247MR only) 300 mV
Pre amp out zone 2-6 1 V
Phantom power 18 VDC
Pre amp out zone1 1 V balanced on euroblock/100
Ohm output impedance
Paging amp out 2 V balanced on euroblock/100
Ohm output impedance
Priority out 24VDC, max 0,6A
Chime 2 tone chime activated by contact
closure
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Instruction manualMA247 series 39
Inputs
MIC/LINE 1 balanced input on euroblock
Sensitivity mic/line variable 3mV to 2V
Impedance 600Ω
S/N mic/line >65dB/>80dB
Phantom power NA
Frequency response 80Hz - 15kHz (+1/-3dB) speech eq
Muting activated by contact mutes inputs with lower priority by
more than 40dB
Mic/line 2-4 balanced inputs on euroblock
Sensitivity mic/line variable 1,5mV to 200mV
Impedance 600Ω
S/N mic/line >65dB/>80dB
Phantom power 18 VDC
Frequency response 80Hz - 15kHz (+1/-3dB) speech eq
Muting activated by contact > 40dB
Emergency input transformer coupled balanced
input on euroblock
Sensitivity 1V
Impedance 600Ω
S/N >80dB
Frequency response 100Hz - 20 kHz (+1/-3dB)
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40 MIXING AMPLIFIERS
Muting Activated by contact or vox (se-
lectable inside the unit).
Emergency has highest priority
and mutes all other inputs by more
than 40 dB. The signal is also
present on the preamp out.
Aux 1 - 2 unbalanced stereo input on
RCA
Sensitivity 500mV
Impedance 22KΩ
S/N >80dB
Frequency response 40 - 25 kHz +1/-3dB
Signal is internally mixed to mono
Aux 3 - 4 unbalanced mono input on
RCA
Sensitivity 500mV
Impedance 22KΩ
S/N >80dB
Frequency response 40 - 25 kHz +1/-3dB
Tuner (MA247MR only)
Tuning range FM band 87,5 - 108 MHz (100 kHz/50 kHz
tuning step)
Tuning range AM band 531 - 1602 kHz (9 kHz tuning
step)
Aerial terminal AM AM antenna spring lock terminal
Aerial terminal FM 75Ω coax connector
Sensitivity FM 1 µV/75Ω at 26 dB S/N
S/N FM band > 74 dB at 40 kHz deviation
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Instruction manualMA247 series 41
Sensitivity AM 40 µV (26 dB S/N)
Harmonic distortion FM band < 0,1% at preamp and tuner
output
Frequency response FM band 30 Hz - 15 kHz (+1/-3 dB) at
preamp and tuner output
Number of presets 10 FM, 10 AM
MP3 (MA247MR only)
Frequency response 20 Hz - 20 kHz (+0/-1 dB) at
preamp output
Harmonic distortion < 0,01% at preamp output
Supported le types USB/SD(HC)/MMC-CARD
MP3 32 - 320 kbps, variable bit
rate
File system/capacity USB/SD(HC)/MMC-CARD
FAT32 up to 32 gigabyte
Apart-Audio general warranty conditions
Apart-Audio warrants this product to be free of defects in material
and workmanship for a period of one* year for parts and for a
period of one* year for labor from the date of original end-user
purchase. This warranty is valid only for the original end-user and
cannot be transferred.
During the warranty period Apart-Audio or one of its authorized
service partners shall either repair or replace any product, free of
charge, that proves to be defective on inspection by Apart-Audio or
its authorized service representative.
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42 MIXING AMPLIFIERS
All warranty claims must be accompanied by a detailed description
of the problem. All returns must be sent to Apart-Audio or an
authorized Apart-Audio repair centre, postage prepaid, insured and
properly packaged. Proof of purchase must be presented in the
form of a valid invoice or some other positive proof that the product
is within the warranty period.
This warranty does not cover any defects caused by faulty
installation, damage due to abuse, neglect, alteration or attempted
repair by unauthorized personnel, system mismatch, insufficient
maintenance or any damage caused by excessive mechanical stress
and is strictly limited to failures arising during normal use that are
due to defects in material or workmanship in the product.
Under no circumstance, Apart-Audio or one of its service centres
can be held responsible for the loss of data caused by a repair or
exchange operation.
Apart-Audio reserves the right to change or improve the design
and/or specification of the product at any time without prior notice.
*warranty period may be different for your country. Please consult
your local dealer.
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Instruction manualMA247 series 43
Notes
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44 MIXING AMPLIFIERS
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Instruction manualMA247 series 45
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developed
by
Audioprof nv
Industriepark Brechtsebaan 8 bus 1
2900 Schoten - Belgium
Company names, product names and trademarks are property of their
respective owners.
Apart-Audio specifications are subject to change without notice.