Bogen WMA-80 Owner's manual

BOGEN
COMMUNICATIONS, INC.
WALL MOUNT MODULAR AMPLIFIERS
WMA-80 & WMA-160
INSTALLATION AND OPERATION
INSTRUCTIONS
The Bogen WMA-80* and WMA-160 are professional quality
wall-mounting amplifiers suited for use in gymnasiums, auditori¬
ums, and banquet rooms where inconspicuous, permanent mount¬
ing is desired. Both models combine modular flexibility with power
MOSFET performance and are available in flush-mount or sur¬
face-mount configurations. A locking panel on the front cover
secures the unit when not in use, and is designed so that it cannot
be removed without access to the area behind the panel.
The WMA-80 and WMA-160 arc ralcd at 80 ami 160 walls,
respectively. Each has 8 input channels: a built-in Lo-Z mic¬
rophone input (with a 3-pin female connector); a Hi-Z Projector
input (with 1/4" connector); and six module ports. The ports accept
any combination of the Bogen D-Series plug-in modules to define
the function of each channel.
Inputs are mixed on an active buss, allowing interaction for
three levels of priority Modules set to priority level 1 are muted
by modules set to priority levels 2 or 3. Modules set to priority level
2 mute modules set to level 1 and are muted by modules set to
priority level 3.
To obtain the best control over room acoustics, the WMA
Series features a 10-band graphic equalizer, which provides ±8dB
at ISO centers of 125,200,315, 500,800,1.2k, 2k, 3.1k, 5k, and 8k
Hz. Equalizer slide controls are located behind the front cover to
prevent tampering after installation and setup. A low-cut filter
(-3dB @ 65Hz) and tone control bypass switch are also provided
and are located in the module port cage.
Individual level controls are provided for each channel. A
Master Volume Control sets the final output level. A bar-graph-
type LED output meter provides output level indication.
Power MOSFET output stages and protective circuitry provide
performance and reliability and eliminate the need for output fuses
and thermal fuse links. A built-in compressor circuit protects
speakers/drivers from damage by limiting the output of the pream¬
plifier to 1 volt.
Each amplifier has a direct 4-ohm output for use in professional
applications plus transformer-coupled 8-ohm and 25V and 70V
outputs. The amplifiers operate from a 120 volt, 60Hz AC source.
A push-to-rescl circuit breaker is included.
UNPACKING
The amplifier was carefully checked before leaving the factory.
Inspect the shipping container and components for evidence of
improper handling. If the unit has been damaged, place an imme¬
diate claim with the dealer/distributor from whom the unit was
purchased. If the unit was shipped directly to you, notify the
transportation carrier without delay and file a claim.
INSTALLATION
CAUTION
These installation instructions are for use by qualified
personnel only. To avoid an elertrio shook, do not perform
any installation or service procedures other than that con¬
tained in the Operating Instructions unless you are
qualified to do so. Refer all servicing to qualified service
pzmmneL
BACK BOX INSTALLATION
A surface-mount or flush-mount cabinet is required for instal¬
lation. Follow the instructions on page 2 of this manual to install
the surface mount (BB-S) or flush-mount (BB-F) enclosure.
OUTPUT CONNECTIONS, LOW-CUT, EQ DEFEAT
The amplifiers provide a direct output at 4-ohms and trans¬
former-coupled 8-ohm, 25V and 70V taps for use with distributed
systems. The WMA-80 includes a 25V center-tapped output.
When using transformer-coupled taps, be sure that the link on
the output terminal strip connects the OUTPUT TRANSFORMER
IN terminal to the DIRECT + terminal. Remove the link when
using the direct output
A Low-Cut filter switch, located in the port cage, reduces
low-frequencies when using transformer-coupled outputs. Set the
switch to IN when using transformer-coupled outputs, and OUT
when using the direct output.
The Tone Control defeat switch, located in the port cage,
bypasses the amplifier’s equalizer filter controls for a flat response.
Set the switch to IN to enable the equalization filters and OUT to
bypass the filters.
MODULE INSTALLATION
Before installing each module, follow the instructions on page
3 of this manual to configure it for the desired function or priority
level. Set the HIGH-/LOW-CUT filter controls and GAIN con¬
trols on modules so equipped to mid-rotation.
To prevent damage to the modules or the amplifier, be sure
that the amplifier POWER switch Is in the OFF position before
installing or removing modules. To install modules, align the top
and bottom edges of the module printed circuit board in the slots
of the port, and slide into the port to engage the edge connectors.
Secure the module with two screws.
ModiHes set to priority level 1 receive (and are muted by)
priority signals from any module set to priority level2 or 3. Modules
set to priority level 2 send priority signals to mute any modules set
to priority level 1, and receive priority signals from any module set
to priority level 3. Modules set to priority level 3 send priority
signals to mute modules set to priority level 1 or 2.
•WMA-80 is UL listed.
Printed In Korsa 9008 94-5887-03

BACK BOX INSTALLATION
1 * 1 )
BB-8 INSTALLATION
1. INSTALL Bfl-S BACK BOX ON
WALL MAKING SURE THAT THE
BOX IS SQUARELY MOUNTED.
ALLOW FREE ACCESS ABOVE
BOX FOR AC WIRING AND
ABOVE OR BELOW BOX FOR
AUDIO WIRING.
2. HAVE POWER WIRING RUN
NEAR UPPER RIGHT HAND
COB HER WMCRE BOX WILL BE
MOUNTED.
S SECURE BOX ON WALL WITH
SCREWS THROUGH BACK
HOLE8 (4 SCREWS).
<A2)
BB-F INSTALLATION
1. PREPARE MOUNTING HOLE
FOR BB-F BACK BOX. HOLE
8IZE SHOULD BE 24-13/1671 X
MINIMUM OPENING
WITH STUDS OR MOUNTING
SURFACES ON EACH SIDE.
2. HAVE POWER WIRING RUN
NEAR UPPER RIGHT HAND
CORNER WHERE BOX WILL BE
MOUNTED.
3. INSTALL BB-F BACK BOX IN
WALL MAKING SURE THAT THE
BOX IS SQUARELY MOUNTED
AND THE FRONT SURFACE
FLUSH WITH THE FMUSHED
WALL. USE SHIMS IF
NECESSARY. ALLOW FREE
ACCESS ABOVE BOX FOR AC
WIRING AND ABOVE OR BELOW
BOX FOR AUDIO WIRING.
4. SECURF RAX IN WALL WITH
SCREWS THROUGH SIDE
SLOTS (4 SCREWS).
5-WITH BOX POSITIONED,
INSTALL 4 ADDITIONAL
SCREWS IN HOLES NEXT TO
04-OT3.
BB-F
<B)
JUNCTION BOX WIRING
1. SUPPLY AC POWER TO UNIT THROUGH
CONDUIT, BX OR ROMEX M ACCORDANCE
WITH LOCAL ELECTRICAL COOES
9 SNAP AC RECEPTACLE INTO JUNCTION BOX
(GNO PIN DOWN) AND CONNECT WIRES AS
SHOWN USING WIRE NUT8.
S 8B-F; IN8TALL JUNCTION BOX IN BB-F AND
SECURE WITH 4 #«X3/8 SCREWS.
BBS: INSTALL JUNCTION BOX IN 88-S AND
accuse with * x a/e screws ano
KEP8NUTS.
<C)
PREPARATIONS BEFORE IN8TAUJNO
AM PURER
1. RUN ALL AUDIO LEADS INTO WALL BOX. THE
PREFERRED ARRANGEMENT IS FOR OUT¬
PUT LEADS TO ENTER THROUGH THE TOP
AND INPUT LEADS TO ENTER THROUGH THE
BOTTOM. USE KNOCKOUTS AS NECES¬
SARY. MAKE SURE WIRES DO NOT REST
AGAINST SHARP EDGES OF BOX
2. INSTALL HINGES (PACKED WITH AMPLIFIER)
USING 6 #8 x 3/8 SCREWS. DO NOT INSTALL
Uirw F RTRFWQ OF I OWED UIUOF (USED
FOR GROUND STRAP CONNECTION - SEE
*D2*).
a CHECK TO SEE THAT AC POWER IS AVAIL¬
ABLE AT THE OUTLET.
FRONT PANEL MOUNTING
1. MOUNT FRONT PANEL (BUT DO NOT
TIGHTEN) WITH 4 #8-32 X 3/8 SCREWS AT
TOP AND BOTTOM OF PANEL
2. INSTALL 2 #8 X 3/8 SCREWS ON INSIDE UP8
OF DOOR OPENING, THEN TIGHTEN ALL
MOUNTING SCREWS. DO NOT OVEn-
TIGHTEN AS U-CLIP WILL STRIP.
3. CHECK TO SEE THAT DOOR OPENS AND
CLOSE8 CORRECTLY.
<D>
AMPUFIER INSTALLATION
1. MOUNT AMPLIFIER ON BACK BOX BY ALIGN¬
ING HINGE PINS AND LOWERING INTO
PLACE.
2. CONNECT GROUND STRAP 8Y INSERTING
MIDDLE HINGE SCREWS THROUGH LUGS OF
GROUND STRAP A8 SHOWN IN ILLUSTRA¬
TION. a ROUND STRAP MUST BE (NETAUXO
TO MEET UL REQUIREMENTS.
a MAKE NECESSARY INPUT AND OUTPUT CON¬
NECTIONS (CARE SHOULO BE TAKEN TO
KEEP INPUT AND OUTPUT LEADS
SEPARATED AS MUCH AS POSSIBLE).
A.WITMPuWEKSWIien IUHNEDOFF, PLUS AC
CORD INTO SIDE OUTLET ON JUNCTION
BOX
5. TURN AMPUFIER ON AND CHECK CONNEC¬
TIONS.
6. SECURE AMPUFIER ILBING a 4AJW . 1/9
SCREWS.
2

MODULE SETUP (FOR QUALIFIED SERVICE PERSONNEL ONLY)
Sound Reinforcement - Modules MM-F & MM-S
Low-impedance, transformer-balanced microphone preampli¬
fier module with HIGH-/LOW-CUT filters, GAIN control (25dB
range), phantom power. MM-F has 3-pin female connector; MM-S
has screw terminals (Terminal #1 Is GND, #2 is LO, and #3 is HI
on all modules).
Phantom Power: Move PHANTOM P.S. jumper to the ON
position for l 22V phantom supply. Select OFF position to
bypass.
Microphone Pacing - Module MP-S
Signal-activatea low-impedance, transformer-balanced micro¬
phone preamplifier module with HIGH-/LOW-CUT filters, GAIN
control (25dB range). Automatic Level Control ((kLC), three levels
of priority and phantom power are jumper selected. Screw terminal
connectors.
Phantom Power: Move PH. P.S. jumper to ON position for
+22V phantom supply. Place jumper on either header pin to
bypass.
ALC. Move ALC jumper lu ON pusltiun; muve lu OFF tu
bypass.
Muting Priority (using PRIORITY ASSIGN jumpers):
Level 1 — Place one jumper in the "1" position and store the
unused jumper on an empty pin.
Level 2 — Place both jumpers in the "2" position.
Level 3 — Place one jumper in the "3" position and store the
unused jumper on an empty pin.
Telephone Paging — Module TP-S
Signal-activated telephone paging module provides a 600-ohm
balanced input with -24dBm sensitivity for matching to telephone
page lines. Includes IIIGH-/LOW-CUT filters and GAIN control
(25dB range). Automatic Level Control (ALC) and three levels of
priority are jumper-selected. Screw terminal connectors.
ALC: Move the ALC jumper to ON position to enable ALC;
move to OFF position to bypass.
Muting Priority (using PRIORITYASSIGN jumpers):
Level 1 — Place one jumper in the "1" position and store the
unused jumper on an empty pin.
Level 2 — Place both jumpers in the "2" position.
Level 3 — Place one jumper in the "3" position and store the
unused jumper on an empty pin.
Auxiliary Input — Module BL-5
Transformer-balanced auxiliary input module suitable for line¬
bridging or line-matching. Use the printed circuit board jumper to
select either 600-ohm input or 10-kitohm input. Screw terminal
connectors.
Line Output - Module LO-S
Module provides jumper-selected 600-ohm transformer-bal¬
anced ( + 4dBm) output or 0.5-watt direct output at 8 ohms. May
be used for line output from the D-Series mixing buss or for
music-on-hold applications. Parallel RCA jades permit one music
source to be used for M.O.H. and background music. A jumper-
selected pad provides 20dB attenuation of the signal from the
music source. LEVEL control sets the module output level.
Output Selection: Select DIRECT or XFMR-coupled output by
placing jumper J4 in the appropriate position. (When using the
direct output, connect the 8-ohm load between screw ter¬
minals #1 and #3. When using transformer output, terminal
#1 is GND, #2 is LO, and #3 Is HI.)
Place jumper J2 in L.O. position for line output or in M.O.H.
position for music-on-hold applications. Connect the music
source to the MUSIC IN (RCA) jack; the MUSIC OUT jack is
paralleled to allow same signal source to be used for back¬
ground music.
Attenuator Pad: Place jumper J3 in the 20dB position to at¬
tenuate the signal connected to the MUSIC IN jack. Bypass the
pad by plating the jumper in the OdB position.
Tone Signal Generation — Module TG-S
The module generates four distinct tones: CHIME, STEADY,
ALARM, and BURST. May be assigned to any of three levels of
priority. Requires customer-supplied contact closure between the
desired Tone and ENABLE screw terminal connectors.
Muting Priority (using PRIORITY ASSIGN jumpers):
Level 1 — Place one jumper in the "1" position and store the
unused jumper on an empty pin.
Level 2 — Place both jumpers in the "2" position.
Level 3 — Place one jumper in the "3" position and store the
unused jumper on an empty pin.
Remote Control/Compression - Module vc-c
Dual-function (jumper-selected) compressor/remote volume
control module. The compressor limits the power amplifier input
signal to 1 volt to prevent overdrive. The DC-operated full range
volume control allows any output setting up to the maximum preset
level of the MASTER control on the D-Series unit.
Compression: Set the PRE/AMP LINK switch on the D-Series
unit to OUT position. Connect the PREAMP OUT jack on the
D-Series unit to the VC-C IN connector. Connect the VC-C
OUT jade to the AMP IN connector on the D-Series unit. Place
jumper J1 in the IN position to enable the compression func¬
tion; move to the OUT position to bypass.
Remote Volume Control: Connect accessory RVC-D to ter¬
minals #2 and #3.
FM Reception - Module FM-T
FM tuner module designed as a preset background music
source. Screwdriver-adjusted tuning. The output is jumper-se¬
lected to the mixing bus of the D-Series unit or to the module’s
RCA-type connector. May be configured to accept priority signals
from other modules. Monaural operation. Screw terminals for
antenna.
Output: Place jumper J1 in OUT position to assign tuner output
to the module's RCA connector. Place jumper J1 in MIX DUS
position to assign module’s output to the D-Series mixing buss.
Mute: Place jumper J2 in the ON position to mute FM-T with
any level 2 or 3 priority signal. Place in OFF position to prevent
muting from priority signals.
MIC/Line Remote Control - Module MR-S
Low-impedance transformer-coupled MIC preamp, or line-
level module with HIGH-/IjOW-CUT filters, GAIN control (25dB
range), phantom power. Full-range DC-operated full-range RVC
allows any output setting up to maximum preset on amplifier
channel control. Screw terminal connectors.
Input: Set Jumper J2 to MIC position for microphone input. Set
to LINE position for line level input.
Phantom Power Move jumper J1 to ON position for +22V
phantom supply. Select OFF position to bypass.
Mute: Place jumper J3 in the ON position to mute MR-S with
any level 2 or 3 priority signal. Place in OFF position to prevent
muting from priority signals.
RVC: Connect accessory RVC-D to terminals #1 and #4.
3

PHYSICAL FEATURES
FRONT CHASSIS CONTROLS AND
INDICATORS (Refer to Figure 1)
POWER
LED LEVEL INDICATORS Bar-type LED meter provides a graphic display of the output level. Illuminates red when levels
above OdB are reached, to indicate possible signal clipping
CHANNEL 1 - G
Individual lovol controls for modulo input channels 1 through 6
MASTER Master control sets overall output level
MIC Level control for fixed microphone input channel
PROJECTOR Level control for the fixed projector input
MIC IN
Professional 3-pln female connector provides a Lo-Z balanced microphone input
PROJECTOR IN 1 /4" connector provides a Hi-Z projector input.for audio-visual applications
EQ FILTER 10 linear-action filter controls provide ±8dB at ISO centers of 125,200,315,500,800,1.2k, 2k,
3.1k. 5k. and 8k Hz
AC BREAKER
Press-to-Reset AC circuit breaker protects against excessive current flow
REAR CHASSIS CONTROLS AND
CONNECTORS (Refer to Figure 2)
OUTPUT TERMINAL STRIP Screw-terminal strip for connection to direct and transformer-coupled outputs. Remove the link
between the DIRECT + terminal and OT IN terminal when using direct output
LO-CUT
FILTER SWITCH
IN: Provides -3dB attenuation @ 65Hz, 6dB/octave
OUT: Bypasses Lo-Cut filter action
TONE CONTROL
SWITCH
IN: Enables EQ filter controls
OUT: Bypasses EQ filter controls for flat response
FIGURE 1
FIGURE 2
(WMA-80 shown)

OPERATION
POWER
The front-panel-mounted rocker switch applies power to the
amplifier and illuminates when power is applied.
EQUALIZATION
Equalizer filter controls are accessible by removing the front
cover (WMA-D). The equalizer provides ±8dB at ISO centers of
125, 20ft, 500, 800, 1.2k, 2k, 3.1k, 5k, and 8kHz. Response is
flat at the center detent position.
CAUTION
Removal of the front cover presents cut electrical shock
hazard. For this reason, adjustment of equalizer filter slide
controls should be performed by qtmGfied service personnel
only.
LEVEL CONTROLS
The level of each channel is controlled by an individual CHAN¬
NEL control. The overall output level is controlled by the MASTER
control. The T.ED output metftr will begin to illuminate red as the
amplifier reaches full output power. A constantly lit red LED
indicates possible signal clipping.
AC CIRCUIT BREAKER
If the AC circuit breaker trips, the power switch pilot lamp will
go out and there will be no output. Place the POWER switch in the
OFF position and reset the breaker by inserting a screwdriver into
the hole on the front panel and depressing the reset switch. Once
the breaker has been reset, return the POWER switch to ON. If
the breaker trips again, the difficulty must be investigated by a
qualified service technician.
THERMAL BREAKER
The thermal breaker opens when the temperature at the output
transistor heat sink reaches 105°C (220°F). If the breaker opens,
there will be no output but the power switch pilot lamp will remain
illuminated. Wait approximately two minutes for the breaker to
reset. If the breaker resets and then opens again, arrange for
qualified service personnel to investigate the cause of the tem¬
perature overload. This may be due to improper load connections
or excessive environmental heat (ambient air temperature above
40°C) with inadequate ventilation.
SERVICE
CAUTION
Then? are no user-semiceabh parts within the unit. Refer
all servicing to qtmlified service personnel
If you experience difficulty with this unit, do not hesitate to ask
uur advice or assistance. Information can be obtained Dy willing to
Service Department, Bogen Communications, Inc., P.O. Box 575,
Ramsey NJ 07446. Include the model number and series designa¬
tion (a letter followed by numbers, stamped on the amplifier
chassis) of your unit. Describe the difficulty and include details on
the electrical connection to associated equipment. We will send
you service information if the trouble appears simple, or the name
and nddre.ee nf the nearest authorized Bogen Service agency to
which you can send the unit for repairs.
When shipping the unit, pack carefully. Send the unit, insured
and prepaid, via any responsible carrier. The unit will be promptly
repaired and returned collect (freight prepaid while in warranty).
SPECIFICATIONS
Output Power Rating
WMA-80:
WMA-160:
80 Watts @ 4-ohms, 8-ohms/25V (WMA-80), 25V and 70V
160 Watts @ 4-ohms, 8-ohms, 25V and 70V
Frequency Response
20Hz to 20kHz, +0,-2dB
Distortion
Direct:
0.3% (max.)
Transformer:
0.3% (max.)
input sensitivity/impedance
Module Channels:
100mV/10-kilohms
Projector Input:
IOOmV/10-kilohms
Mic. Input:
.'Wty V/300-oh m e
Equalization
±8dB @ ISO centers of 125, 200, 315, 500, 800,1.2k, 2k, 3.1k, 5k, and 8kHz
Hum & Noise
-75dB or better
Inputs
Low-Z balanced microphone, Hi-Z Projector, 6 input module ports
Lu-Cut niter
-3dB @ 63Hz, wu/octave
Outputs
Direct - 4-ohms; Transformer - 8-ohms, 25V, 25VCT (WMA-80), 70V
Controls Level controls for channels 1 - 6, MIC, PROJECTOR; MASTER Volume;
10 Equalizer filter slide controls: Illuminated POWFR switch;
LO-CUT filter switch; TONE IN/OUT switch; Push-to-Reset circuit breaker
Dimensions
BB-F Flush-mount Box:
BB-S Surfaco mount Box:
WMA-D Front Cover:
24-3/4"H x 14-1/4"W x 3-7/8‘D (62.8x36.2x9.8cm)
26-3/4*H x 16-1/4-W x 3-7/Q"D (67.9x41.3x9.8cm)
26-3/4'H X 16-1 /4"W x 3/4"D (67.9x41.3x1.9cm)
Power Required
120V, 60Hz AC -
5

COMMUNICATIONS, INC-
50 SPRING STREET. P,0. Bo« 575
RAMSEY. NJ 07446 [phone]