Sam Ash Music SM4 4-Channel Mixer User Manual
Sam Ash Music Corporation 4-Channel Mixer
User Manual
OWNER'S MANUAL
SM4 4-Channel Mixer
2
Copyright 2017
v1
Samson Technologies Corp.
278-B Duffy Ave
Hicksville, New York 11801
Phone: 1-800-3-SAMSON (1-800-372-6766)
www.samsontech.com
The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth
SIG, Inc. and any use of such marks by Samson Technologies is under license. Other
trademarks and trade names are those of their respective owners.”
SM4 4-Channel Mixer 3
Important Safety Information
If you want to dispose this product, do not mix it with general household
waste. There is a separate collection system for used electronic products
in accordance with legislation that requires proper treatment, recovery and
recycling.
Private household in the 28 member states of the EU, in Switzerland and Norway
may return their used electronic products free of charge to designated collection
facilities or to a retailer (if you purchase a similar new one).
For Countries not mentioned above, please contact your local authorities for a correct
method of disposal.
By doing so you will ensure that your disposed product undergoes the necessary
treatment, recovery and recycling and thus prevent potential negative effects on the
environment and human health.
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER
(OR BACK) AS THERE ARE NO USER-SERVICEABLE PARTS INSIDE. REFER
SERVICING TO QUALIFIED SERVICE PERSONNEL.
This lightning flash with arrowhead symbol within an equilateral
triangle is intended to alert the user to the presence of non-insulated
“dangerous voltage” within the product’s enclosure that may be of
sufficient magnitude to constitute a risk of electric shock.
The exclamation point within an equilateral triangle is intended to
alert the user to the presence of important operating and maintenance
instructions in the literature accompanying the appliance.
ATTENTION
RISQUE DE CHOC ÉLECTRONIQUE -
NE PAS OUVRIR
CAUTION
To prevent electric shock hazard, do not connect to mains power supply
while grille is removed.
4
Important Safety Information
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the manufac-
turer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or
other apparatus (including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding type plug. A po-
larized plug has two blades with one wider than the other. A grounding type plug
has two blades and a third grounding prong. The wide blade or the third prong
are provided for your safety. If the provided plug does not fit into your outlet,
consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at the
plugs, convenience receptacles, and at the point where they exit from the appa-
ratus.
11. Only use attachments/accessories specified by the manufacturer.
12. Use only with the cart, stand, tripod, bracket, or table specified by
the manufacturer, or sold with the apparatus. When a cart is used,
use caution when moving the cart/apparatus combination to avoid
injury from tip-over.
13. Unplug the apparatus during lightening, sort or when unused for long periods of
time.
14. Refer all servicing to qualified personnel. Service is required when the apparatus
has been damaged in any way, such as power supply cord or plug is damaged,
liquid has been spilled or objects have fallen into the apparatus has been ex-
posed to rain or moisture, does not operate normally, or has been dropped.
15. This appliance shall not be exposed to dripping or splashing water and that no
object filled with liquid such as vases shall be placed on the apparatus.
16. Caution-to prevent electrical shock, match wide blade plug wide slot fully insert.
17. Please keep a good ventilation environment around the entire unit.
18. POWER ON/OFF SWITCH: For products with a power switch, the power switch
DOES NOT break the connection from the mains.
19. MAINS DISCONNECT: The plug should remain readily operable. For rack-mount
or installation where plug is not accessible, an all-pole mains switch with a
contact separation of at least 3mm in each pole shall be incorporated into the
electrical installation of the rack or building.
SM4 4-Channel Mixer 5
Important Safety Information
FCC Notice
1. This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions:
(1) This device may not cause harmful interference.
(2) This device must accept any interference received, including interference that
may cause undesired operation.
2. Changes or modifications not expressly approved by the party responsible for com-
pliance could void the user’s authority to operate the equipment.
FCC Statement
This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installa-
tion.
This equipment generates uses and can radiate radio frequency energy and, if not in-
stalled and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful interference
to radio or television reception, which can be determined by turning the equipment
off and on, the user is encouraged to try to correct the interference by one or more of
the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which
the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
FCC Radiation Exposure Statement
This equipment complies with FCC RF radiation exposure limits set forth for an
uncontrolled environment. This equipment should be installed and operated with a
minimum distance of 20 centimeters between the radiator and your body.
RF Warning Statement
The device has been evaluated to meet general RF exposure requirement. The device
can be used in portable exposure condition without restriction.
This device complies with RSS-310 of Industry Canada. Operation is subject to the
condition that this device does not cause harmful interference.
6
Thank you for purchasing the Samson SM4 4-Channel Mixer. The SM4 rack mount
mixer is a versatile tool for many sound applications. Featuring microphone and
music inputs as well as Bluetooth® connectivity for streaming audio and a USB jack
for connecting an optional Samson XPD USB Digital Wireless System.
In the box, you’ll find a registration card enclosed—please don’t forget to follow the
instructions so that you can receive online technical support and so we can send you
updated information about this and other Samson products in the future. Also, be sure
to check out our website (www.samsontech.com) for information about our full product
line. We recommend you keep the following records for reference, as well as a copy of
your sales receipt.
Serial number: _________________________
Date of purchase: _________________________
If you have any questions or comments regarding the SM4 or any other products from
Samson, do no hesitate to contact us at support@samsontech.com.
With proper care and maintenance, your SM4 will operate trouble-free for many years. Should
your SM4 ever require servicing, a Return Authorization (RA) number must be obtained
before shipping your unit to Samson. Without this number, the unit will not be accepted.
Please visit www.samsontech.com/ra for an RA number prior to shipping your unit. Please
retain the original packing materials and, if possible, return the unit in its original carton.
If your SM4 was purchased outside of the United States, contact your local distributor for
warranty details and service information.
I• 4-channel stereo line mixer
• Microphone input with 2-band EQ (balanced XLR-1/4” combo)
• Stereo line input (rear mounted RCA inputs, front-mounted stereo 1/4” and 1/8” [3.5mm])
• Bluetooth® connectivity to wirelessly stream music
• USB port for use with Samson’s Stage XPD Series USB Digital Wireless Systems (sold
separately) and phone charging
• Voiceover control with priority ducking and variable hold time
• Rear panel master volume control
• 15V phantom power
• Mono/Stereo output switch
• Compact, half-rack steel chassis
• Rackmount kit and power adapter included
Introduction
Features
SM4 4-Channel Mixer 7
1. Power Switch - Use this switch to turn the SM4 on and off. To avoid potential
damage to your speakers, turn the SM4 on before you turn on any connected
power amps, and turn it off after the power amps are turned off.
2. Power Indicator - LED lights white indicating the unit is powered on.
3. MIC Volume - This knob controls the level of the MIC input.
4. BASS Equalizer Knob - Controls the MIC channel low frequency band, +/- 15dB at
100Hz.
5. TREBLE Equalizer Knob - Controls the MIC channel high frequency band, +/- 15dB
at 10kHz.
6. MUSIC Volume - This knob controls the level of the Music inputs (rear panel RCA,
front panel 1/4” and 1/8”).
7. VOICEOVER - Controls the level the Music channel and Bluetooth® audio will be
lowered when there is signal on the Mic channel.
8. 1/8” (3.5mm) Music Input - Stereo 1/8” (3.5mm) jack to connect line level
sources. Level of this input is controlled by the MUSIC Volume knob.
9. 1/4” Music Input - Stereo 1/4” jack to connect line level sources. Level of this
input is controlled by the MUSIC Volume knob.
10. Pairing Indicator - Displays the Bluetooth status of the SM4.
11. Pairing Button - Press and hold this button to enable discoverable mode in order
to pair with a Bluetooth audio device.
12. Samson XPD WIRELESS USB Input - Connect an optional Samson XPD USB Digital
Wireless receiver to this input. The wireless level is controlled by the MIC Volume
control. The USB connector supplies 5V 200mA at of power to charge a small
portable USB device like an MP3 player or smartphone.
13. Bluetooth Antenna - This antenna receives signal from a paired device and should
be placed in a vertical position when using the Bluetooth. The Bluetooth receiver
has a range of approximately 100’ (30m).
Front Panel Callouts
8
1. DC Input - Connect the supplied power adapter here, using the strain relief* as
shown in the illustration below. WARNING: Do not substitute any other kind of
power adapter. Doing so can cause severe damage to the SM4 and will void your
warranty.
2. BAL MIC INPUT - Use this Combo XLR plus 1/4” jacks to connect a microphone or
wireless microphone receiver. The XLR input provides 15-volt phantom power for
use with condenser microphones.
3. Stereo RCA MUSIC INPUT - Stereo line level input for connecting the output of de-
vices such as MP3, CD, or any line level audio device using standard RCA cables.
4. VOICEOVER HOLD - This knob controls the hold time of the VOICEOVER priority
ducking from 0.5s–3s.
5. MASTER VOLUME - The MASTER VOLUME knob controls the overall output level.
This knob determines the final output signal level. Signals from all channels are
routed here just before being routed to the OUTPUT jacks.
6. Balanced XLR OUTPUT - Balanced XLR outputs to connect the SM4 to a power
amplifier or speakers. In recording applications, these outputs can be used to
connect to a stereo device such as computer sound card, MP3, or hard disk
recorder. The signal at the OUTPUT jacks follow the MASTER VOLUME control.
7. STEREO / MONO Switch - When the switch is in the out, STEREO position, the
left and right signals are routed to the corresponding outputs. In the in, MONO,
position, the left and right input signals are summed together and fed to both
Left and Right OUTPUT jacks.
8. Unbalanced RCA OUTPUT - Unbalanced RCA outputs to connect the SM4 to a
power amplifier or speakers. In recording applications, these outputs can be used
to connect to a stereo device such as computer sound card, MP3, or hard disk
recorder. The signal at the OUTPUT jacks follow the MASTER VOLUME control.
Rear Panel Callouts
*Using the strain relief: Gather up a loop of wire and pass it
through the strain relief, then pass the adapter plug through
the loop in order to create a knot.
SM4 4-Channel Mixer 9
1. Remove all packing materials and decide where the unit is to be physically
placed. The SM4 can be mounted in any standard 19” rack (requiring one rack
space), or used on a tabletop.
2. Before connecting a microphone or line level audio device, make sure that the
power to all your systems components, including the SM4, are turned off.
3. Using an XLR or 1/4” cable, connect a wired microphone or the output of a wire-
less microphone receiver to the Mic input jack on the rear of the SM4.
4. Connect a music source, like a CD player, to the RCA jacks on the rear panel of
the SM4. The red connector is the right input and the white connector is the left
input. Portable audio devices, like an MP3 player, can be connected to the 1/4”
or 1/8” stereo inputs on the front of the SM4.
5. Connect the outputs of the SM4 to the inputs of a power amplifier or speaker
system using XLR or RCA cables.
6. Turn the SM4 Master Volume control all the way down and turn the SM4 power
on.
NOTE: It is important to remember the Golden Rule of audio … “LAST ON,
FIRST OFF”. Translated, this means that when turning on your system, you
should always turn your power amplifiers or powered monitors on LAST, and
when turning your system off, turn your power amps off FIRST. This helps avoid
any loud pops caused by rush current at power up, which can sometimes dam-
age loudspeakers.
7. Turn the power amplifier or speaker system on and turn the volume up.
8. Set the MIC volume control of the SM4 to the 12 o’clock position.
9. While talking into the microphone, raise the MASTER VOLUME control until you
have reached the desired level.
10. Play music from the connected music source and raise the MUSIC volume con-
trol. Adjust the MIC and MUSIC volume until the microphone signal is able to be
heard above the music.
Quick Start
Feedback is the annoying howling and squealing that can heard when the
microphone picks up sound from the speaker. The sound is then re-amplified back
through the speaker again, creating a feedback loop. Follow these steps to minimize
the likelihood of feedback:
• Avoid pointing the microphone directly at the speakers. In general it is
recommended that the microphone be positioned behind the speaker enclosure.
This uses the directional characteristics of the speaker and microphone to your
advantage.
• Keep the microphone as far from the speakers as possible. This will help achieve
isolation between the speaker and the microphone.
• Position the microphone as close to the sound source as possible. This will
enable the microphone to pick up more direct sound, and allow you to reduce
the microphone input gain control.
Avoiding Feedback
10
Bluetooth is a wireless communication technology that allows for connectivity
between a wide range of devices. The SM4 uses Bluetooth to stream high quality
audio from your Bluetooth enabled device without the need for connecting any
cables. In order for your device to work with the SM4 it must first be paired.
1. With the SM4 and your Bluetooth device powered on, press and hold the PAIR
button on the front panel of the SM4 mixer to make the mixer discoverable. The
blue Bluetooth indicator will flash slowly.
2. In the settings of your Bluetooth device, set it to “discover” available devices.
3. From the Bluetooth device list, select the "Samson SM4" device.
4. If your device asks for a passkey, enter digits 0000 (four zeros) and press OK.
Some devices may also ask you to accept the connection.
5. As the SM4 is connecting to your device, the Bluetooth indicator will quickly
flash blue.
6. The SM4 speaker indicates that pairing is complete when the indicator turns
steady blue. You can now stream audio from your device to the SM4 speakers.
7. On your Bluetooth device, start playing music. Use the volume control on your
Bluetooth to set the desired level.
Pairing with a Bluetooth® device
SM4 4-Channel Mixer 11
Specifications
Frequency Response (Level@Max, unity gain +1/-3dB)
Mic to Main 30Hz~30KHz
T.H.D (Level@Max, unity gain, 20Hz~30KHz A-Weighted)
Mic/Line to Main <0.02%
Line to Main <0.02%
Equivalent Input Noise
Mic (Level@Max) <-75dB 20Hz~30KHz A-weighted
Maximum Voltage Gain
Mic to Main 32dB
Line to Main 8dB (RCA Input)
Stereo Line to Main 8dB (1/4’,1/8’ Input)
Residual Noise (30kHz LPF, all control Min)
Main (All Level min) -110dB
Crosstalk (@1kHz w/30kHz LPF)
Input vs. Output (unity gain,Level set min,) >82dB
Input vs. Output (Max output,Level set min) >70dB
Maximum Input Level (@1kHz)
Mic Input -18dB
Maximum Output Level (@1kHz)
Mic Output +14dB
Input Channel Equalizer (±3dB)
High ±12dB@12KHz
Low ±10dB@80Hz
USB Output Power USB3.0 +5V DC 0.2A max
Phantom Power 15 Volts DC
Power Requirements DC15V 800mA
Bluetooth Bluetooth V4.0, A2DP
Dimensions and Weight
Dimensions 8.78” x 5.43” x 1.69”
223mm x 138mm x 43mm
Weight 1.76 lbs / 0.8 kg
Samson Technologies Corp.
278-B Duffy Ave
Hicksville, New York 11801
Phone: 1-800-3-SAMSON (1-800-372-6766)
www.samsontech.com