B1 19MENU 1 YST SW40 19&30 Manual (21 4138) V01

User Manual: YST-SW40

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B1-19/B1-30
POWERED
SUBWOOFER

FEATURES OF THE AMCTM MODEL B1-19/B1-30
* The AMC models B1-19/B1-30 are designed to meet professional quality
performance standards and to provide superior value.
* Selected grade components are utilized throughout the circuit design with
special emphasis on components within the audio path to assure stable and
consistent performance.
* Built-in unique AMC smooth-clipping circuit to give soft, sweet and musical
sound. It functions also an overload protection for safe and high volume
performance.
* Provide gold-plated RCA jacks for low level inputs and high quality 5-way
gold-plated binding posts for high level inputs and outputs, allowing easy
connection to any system.
* Level, crossover (adj., 40 to 180Hz) and phase (con. adj. 0 to 180 degree)
controls allow you to optimize performance to match your audio system, room
acoustic, and program material.
* Incorporated with a high-end polypropylene cone 8" woofer in B1-19 and 10"
woofer in B1-30.
* Fully discrete power amplifier design to ensure the amplifier is capable of
supplying high power and current (100W/70A for B1-19 and 150W/100A for B130) into a very low impedance which is always a driver is actually acting.
*Auto mute circuit that automatically turns your subwoofer on when it senses a
program signal. When no signal is present, the circuit mutes the subwoofer.
* One front firing bass port for B1-19 and two for B1-30.
AMC B1-19/B1-30 are excellent products, based on new technology. They
are very simple to install and operate and possess excellent performance
and great flexibility.
In order to avoid risk of damage and ensure optimum performance from
your subwoofer, you should take time to read this manual before
proceeding to unpack and install it.
Unpacking
Remove the subwoofer from the carton carefully. If it is possible, please save
the carton for later use. If the system is damaged in any way, contact your
dealer immediately.

REAR PANEL CONNECTIONS
REAR PANEL

LEVEL

MIN

MAX
PHASE

3
0

180

LOW PASS

40Hz

180Hz

LINE IN

POWER

ON
POWER STAND BY

Powered Subwoofer B1-30

WELTRONICS CORP.
LONDON/L.A.

HIGH LEVEL INPUTS

SERIAL NUMBER

OFF
POWER RATING

250VA

120V

60Hz

DESIGNED AND ENGINEERED IN LONDON/LOS ANGELES
PRODUCED TO AMC INT'L QUALITY STD

HIGH LEVEL OUTPUTS

CAUTION

ATTENTION

RISK OF ELECTRIC SHOCK
DO NOT OPEN

DANGER D'ELECTROCUTION
NE PAS OUVRIR

1. AC LINE CORD
2. POWER SWITCH

3. SETTING OF CONTROLS
4. INPUT/OUTPUT CONNECTIONS

REAR PANEL CONNECTIONS AND CONTROLS
1. AC LINE CORD
Since the subwoofer contains its own
amplifier, it must be connected to a mains
outlet. Two versions of B1-19/B1-30
subwoofer model are manufactured, one
for 110-120V and another for 220-240V
operation. Check the manufacturer's
labels to make sure that the correct
model has been supplied. Plug the AC
line cord into a switched outlet on your
amplifier or into any AC wall outlet that
provides the correct line voltage.

subwoofer, B1-19 or B1-30 may, however,
due to the very low harmonic distortion, in
practice be moved quite far from this
position without any detrimental effect on
the sound reproduction as the subwoofer
frequencies are not directionally.
There are three control knobs on the rear
of the subwoofer. These controls make it
possible to match the low bass
frequencies from the subwoofer to the
bass
midrange
treble sound of any
good satellite stereo speakers for
optimum sound, and at the same time to
compensate for room-effects and different
positions of the subwoofer.

2. POWER SWITCH
The subwoofer can be turned on or
completely switched off by pushing the
rocker type power switch on the panel.
The white lettering "1" on the power
switch indicates power ON position and
"0" indicates power OFF position.

Your hearing is the final arbiter of
correct settings.
The adjustments can be optimized
without the aid of any tools except ear
and good quality music records. Before
your making final adjustments, make sure
your basic stereo system is in good
working order.

Automatic on/off
Since the subwoofer is equipped with an
automatic on/off facility, turning the
system on every time it is to be used is
avoided. When the system is connected
to the mains, an amber LED indicates
STAND-BY status. In the presence of an
audio signal with a level more than 5mV
the system is automatically switched on
as shown by a green LED. If there is no
signal or a signal less than 5mV for five
minutes, the system automatically shuts
off.
This subwoofer is designed for
continuous STAND-BY operation, and
then draws negligible power. If the system
is not to be used for a long period of time,
such as a vacation trip, disconnect the
system by pushing the power switch to off
position or removing the mains plug to
completely separate the subwoofer from
the mains.

Acoustic feedback
Since the subwoofer can produce a
considerable output level at low
frequencies, acoustic feedback via the
turntable can occur. To ensure that this is
not the case, perform the following test at
installation of the subwoofer, if it is
possible.
Set up the equipment with record playing.
Place the pick-up on a non-rotating
record (disconnect the turntable power
cord if necessary). Tap the turntable while
gradually increasing the volume control. If
there is a shift in the sound character
from the loudspeakers (towards sustained
sound) before the volume control has
been advanced to a setting that
represents loud listening, acoustic
feedback is a problem. Moving the
turntable or the speakers may remedy
this problem. Or try placing an antivibration pad under the turntable.

3. SETTING OF CONTROLS
In theory, the best position for the
subwoofer is midway between the
satellite speakers, with its front facing
forward and in the same place as the
fronts of the satellite speakers. The
4

A. LOW PASS
The lower frequency limit of the
subwoofer is always 30Hz. With this
control, an adjustable, second order
(12dB/octave) low pass filter gives an
upper limit between 40Hz to 180Hz.
B. PHASE
With this control, the phase shift between
input signal and output signal can be
continuous adjustable from 0 to 180
degree. You can use this control to
eliminate the possible standing waves
around the position of your listening seat.
C. LEVEL
With this control the volume of the
subwoofer is set to properly match the
satellite speakers.
The easiest way is to set this control to
the point where the acoustic power of
your subwoofer is close to the satellite
speakers or surround speakers.

4. INPUT/OUTPUT CONNECTIONS
Before attempting to make any connections to or from this unit, be sure to first switch
OFF the power to this unit and to any other components to which connections are
being made. When making connections between this unit and other components, be
sure all connections are made correctly and consistently, that is to say, L (left) to L, R
(right) to R, "+" to "+" and "-" to "-".
B1-19/ B1-30 can be connected to either the speaker terminals or the line outputs of
the amplifier. Some examples of connections are shown below:
A. Connecting to the speaker terminals of a stereo power amplifier or integrated
amplifier or receiver
Connect L and R speaker terminals of the power amplifier or integrated amplifier or
receiver to High Level Inputs of the B1-19/B1-30 subwoofer and route the High Level
Outputs of the subwoofer to the L and R satellite speakers. With this connection, the
music content below 85Hz (if the impedance of the satellite is 8 ohm) will be amplified
and come out of the subwoofer. At the same time the music content above 85Hz will
be out of the satellite speakers as normal..
LEFT SPEAKER

RIGHT SPEAKER

LINE IN

L
POWER STAND BY
R

HIGH LEVEL INPUTS

THIS UNIT

HIGH LEVEL OUTPUTS

LEVEL

MIN

MAX
PHASE

+
0

180

LOW PASS

40Hz

180Hz

LINE IN

POWER

POWER STAND BY

Powered Subwoofer B1-30

WELTRONICS CORP.
+

AMPLIFIER

LONDON/L.A.

HIGH LEVEL INPUTS
R

SERIAL NUMBER
POWER RATING

250VA

120V

60Hz

DESIGNED AND ENGINEERED IN LONDON/LOS ANGELES
PRODUCED TO AMC INT'L QUALITY STD

Volume

Tape
Source

Aux

Tuner
Video 1

HIGH LEVEL OUTPUTS

Power

Phones
Video 2

CAUTION

ATTENTION

RISK OF ELECTRIC SHOCK
DO NOT OPEN

DANGER D'ELECTROCUTION
NE PAS OUVRIR

B. Connecting to pre out or subwoofer out terminal(s)
For pre out terminal connection, the amplifier must possess at least two sets of pre out
terminals. With some amplifiers with only one set of pre out terminals, connection can
result in no sound from the main left and right speakers. In this case, select the
method of connecting to the speaker terminals.
When connecting Subwoofer out to B1-19 or B1-30, be sure to turn crossover
clockwise to 180 Hz for the best reproduction of low frequencies content.

LEFT SPEAKER

RIGHT SPEAKER

PREAMPLIFIER OR DECODER
Volume

Tape
Source

Aux

Tuner
Video 1

Power

Phones
Video 2

SUBWOOFER

THIS UNIT

PRE OUT

LINE IN
LEVEL

L
MIN

MAX
PHASE

POWER STAND BY
0

180

LOW PASS

40Hz

HIGH LEVEL INPUTS

180Hz

LINE IN

POWER

L
POWER STAND BY

Powered Subwoofer B1-30

WELTRONICS CORP.
LONDON/L.A.

HIGH LEVEL INPUTS

SERIAL NUMBER
POWER RATING

250VA

120V

60Hz

DESIGNED AND ENGINEERED IN LONDON/LOS ANGELES
PRODUCED TO AMC INT'L QUALITY STD

HIGH LEVEL OUTPUTS

CAUTION

ATTENTION

RISK OF ELECTRIC SHOCK
DO NOT OPEN

DANGER D'ELECTROCUTION
NE PAS OUVRIR

HIGH LEVEL OUTPUTS

SPECIFICATIONS
B1-19

Description

B1-30

30-180Hz

Adjustable, 40 to 180Hz

89dB

Continuous power

100W @ 100Hz, 4 ohm, 0.1% THD

150W @ 100Hz, 4 ohm, 0.1% THD

Dynamic power

150W(21.8dBW)

250W(24dBW)

THD @ rated power

0.008%

Max. o/p current

>70A(1mS)

>100A(1mS)

S/N @ rated power

100dB

LPF

Butterworth, -12dB/octave, <325Hz

-24dB/octave, >325Hz

Frequency response
Sensitivity
Amplifier section

Acoustic design
Woofer

8", Injection PP cone

10", Injection PP cone

Internal volume

19 litter

30 litter

Design type

Bass reflex - front port x1

Bass reflex - front port x2

270x396x305 mm

305x420x470 mm

Net

14Kg

20Kg

Shipping

17Kg

23Kg

Black oak

Cherry, teak

Dimension (WxHxD)
Weight

Finish
Features

5-way gold-plated binding post - in/out 5-way gold-plated binding post - in/out
Stereo gold-plate RCA jack - line in

Stereo gold-plate RCA jack - line in

Con. adjustable, 0 to 180 degree

Auto-turn on/off

Soft-clipping facility

Captive power cord

One-piece fiberglass double side PCB One-piece fiberglass double side PCB
Master power switch

Master power switch

Weltronics Corp. reserves the right to improve its products at any time. Specifications are
subject to change without notice.
8

SAFETY INSTRUCTION
1. READ INSTRUCTIONS

16. DAMAGE REQUIRING SERVICE

All the safety and operating instructions should be read
before the appliance is operated.
2. RETAIN INSTRUCTIONS
The safety and operating instructions should be retained for
future reference.
3. HEED WARNINGS
All warnings on the appliance and in the operating instructions
should be adhered to.
4. FOLLOW INSTRUCTIONS
All operating and use instructions should be followed.
The appliance should not be used near water - for example,
near a bathtub, washbowl, kitchen sink, laundry tub, in a wet
basement, or near a swimming pool, etc.
6. CARTS AND STANDS
The appliance should be used only with a cart or stand that is
recommended by the manufacturer.

7. WALL OR CEILING MOUNTING

17. POWER LINES
(APPLIES TO TUNER AND RECEIVERS ONLY)
An outdoor antenna should be located away from power lines.

5. WATER AND MOISTURE

6A. An appliance and cart combination should be
moved with care. Quick stops, excessive force,
and uneven surfaces may cause the appliance
and cart combination to overturn.

The appliance should be serviced by qualified service
personnel when:
a) The power-supply cord or the plug has been damaged; or
b) Objects have fallen, or liquid has been spilled into the
appliance; or
c) The appliance has been exposed to rain; or
d) The appliance does not appear to operate normally or
exhibits a marked change in performance; or
e) The appliance has been dropped, or the enclosure is
damaged.

PORTABLE CART WARNING

S3125A

This equipment is not designed for use mounted on a wall or a
ceiling.
8. VENTILATION
The appliance should be situated so that its location or position
does not interfere with its proper ventilation. For example, the
appliance should not be situated on a bed, sofa, rug, or similar
surface that may block the ventilation openings, or placed in a
built-in installation, such as bookcase or cabinet that may
impede the flow of air through the ventilation openings.
9. HEAT
The appliance should be situated away from heat sources
such as radiators, heat registers, stoves, or other appliances
(including amplifiers) that produce heat.

18. OUTDOOR ANTENNA GROUNDING
(APPLIES TO TUNER AND RECEIVERS ONLY)
If an outside antenna is connected to the receiver, be sure the
antenna system is grounded so as to provide some protection
against voltage surges and built up static charges.
Section 810 of the National Electrical Code, ANSI/NFPA No.
70-1984, provides information with respect to proper
grounding of the mast and supporting structure, grounding of
the lead-in wire to an antenna discharge unit, size of grounding
conductors, location of antenna-discharge unit, connection to
grounding electrodes, and requirements for the grounding
electrode. See Figure.
a) Use No. 10 AWG (5.3 mm2) copper, No. 8 AWG (8.4 mm2)
aluminum, No. 17 AWG (1.0 mm2) copper-clad steel or
bronze wire, or larger, as a ground wire.
b) Secure antenna lead-in and ground wires to house with
stand-off insulators spaced from 4-6 feet (1.22-1.83 m)
apart.
c) Mount antenna discharge unit as close as possible to where
lead-in enters house.
d) Use jumper wire not smaller than No.6 AWG (13.3 mm2)
copper, or the equivalent, when a separate antennagrounding electrode is used. See NEC Section 810-21(j).
Antenna Grounding According to
the National Electrical Code

10. POWER SOURCES
The appliance should be connected to a power supply only of
the type described in the operating instructions or as marked
on the appliance.

Antenna Lead
In Wire

11. POWER-CORD PROTECTION
Power-supply cords should be routed so that they are not likely
to be walked on or pinched by items placed upon or against
them, paying particular attention to cords at plugs,
convenience receptacles, and the point where they exit from
the appliance
12. CLEANING
The appliance should be cleaned only as recommended by
the manufacturer.

Ground
Clamp

Electric
Service
Equipment

The power cord of the appliance should be unplugged from the
outlet when left unused for a long period of time.

Power Service Grounding
Electrode System
(NEC Art 250 Part H)

14. OBJECT AND LIQUID ENTRY

15. SERVICING
The user should not attempt to service the appliance beyond
that described in the operating instructions. All other servicing
should be referred to qualified service personnel.

Grounding Conductors
(NEC Section 810.21)
Ground Clamps

13. NON USE PERIODS

Care should be taken so that objects do not fall and liquids are
not spilled into the enclosure through openings.

Antenna
Discharge
Unit (NEC
Section 810.20)

National Electrical Code
Available from Library, book
stores, or National Fire Protection
Association (Batterymarch Park,
Quincy. MA 02269).

WELTRONICS CORP.
LONDON/L.A.
AMC Web: http://www.amchome.com
PN: 21-4138

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