Bogen Stereo Amplifier GS 100 User Manual

Gold Seal Series Amplifiers  
Models GS-35, GS-60, GS-100, GS-150, GS-250  
The Bogen Gold Seal Series amplifiers are an extraordinary addition to Bogen's line of quality audio amplifiers. Designed  
with the sound contractor in mind, they provide unparalleled flexibility and versatility, without the need for expensive add-  
on modules.  
Unlike other typical amplifier lines, the professional sound contractor need not purchase a higher-powered amplifier just to  
get more extensive features or flexibility. Each of the Gold Seal Series amplifiers — 250W, 150W, 100W, 60W and 35 W  
models — incorporate the exact same set of features.  
In addition to its extensive input flexibility, the Gold Seal Series amplifiers offer a combination of features not found in any  
other commercial amplifier.  
Features  
• 4 dedicated microphone inputs (XLR connectors)  
• 1 selectable Mic/Tel input  
• 1 selectable Mic/Aux input  
• 1 dedicated Aux input  
• 4-ohm direct coupled output  
• Remote master volume control capability  
• Input muting via contact on all inputs  
• Voice activated aux muting on Tel input  
• Automatic level control on Tel input  
• Aux fade back after Tel page  
• 8-ohm, 25V, 25VCT, and 70V transformer-  
coupled outputs  
• 35W, 60W, 100W, 150W and 250W versions  
• Rack mountable — 2RU package for all models  
• Dual function 10-band graphic equalizer (Acoustic  
EQ/Feedback Control)  
• Preamp out/Power amp in connections  
• Booster amp output connection  
Tape output connection  
• Balanced line driver output (using  
WMT1A accessory)  
• Lo-cut filter for Mic channels  
• True loudness contour function  
• Aphex® Aural Exciter for improved intelligibility  
• Switchable phantom power supply  
• Variable Aux input muting  
• 3-speed fan cooling (GS-250 only)  
• Available tamper resistant front cover  
• Available rack mounting kit  
• Available remote volume control  
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Contents  
Important Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2  
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2  
Packing List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2  
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2  
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3  
Front panel (All Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3  
Rear panel (Models GS-35, GS-60, GS-100, GS-150) . . . . . . . . . . . . . . . . . . . . . . . . . . . .4  
Rear Panel (GS-250) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5  
Input Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6  
Mic 1-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6  
Mic 5/Tel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6  
Mic 6/Aux1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6  
Aux 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6  
Phantom Power for Mic 5 & Mic 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6  
Remote Volume Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7  
Precedence Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7  
Output Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8  
Output Terminal Strip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8  
WMT-1A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8  
To Power Amp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8  
Pre-Out/Power In Jack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8  
Tape Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8  
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9  
Power Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9  
Individual Volume Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9  
Lo-Cut Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9  
Contour Pushbutton Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9  
Aphex Aural Exciter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9  
Dual Function Acoustic Equalizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9  
Telephone Paging Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10  
Variable Mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10  
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11  
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12  
Bogen Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12  
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13  
1
 
Important Safety Instructions  
1. Read and understand all instructions.  
2. Follow all warnings and instructions marked on the product.  
3. Unplug the product from the wall outlet before cleaning. Do not use liquid cleaners or aerosol cleaners. Use a damp  
cloth for cleaning.  
4. Do not use this product near water.  
5. Do not place this product on an unstable cart, stand or table, where the product may fall, causing serious damage to the  
product.  
6. Slots and openings in the cabinet and the back or bottom are provided for ventilation, to protect it from overheating.  
These openings must not be blocked or covered. This product should not be placed in a built-in installation unless prop-  
er ventilation is provided.  
7. This product should be operated only from the type of power source indicated on the marking label.  
8. The power supply included with this product has a 2-prong plug for connection with a standard electrical outlet. Do not  
allow anything to rest on the power cord. Do not locate this product where the cord will be abused by persons walking  
on it.  
9. Do not overload wall outlets and extension cords as this can result in the risk of fire or electrical shock.  
10.Never push objects of any kind into this product through cabinet slots as they may touch dangerous voltage points or  
short out points that could result in a risk of fire or electric shock. Never spill liquid of any kind on the product.  
11.To reduce the risk of electric shock, do not disassemble this product, but return it to the factory service center when  
some service or repair work is required. Opening or removing covers may expose you to dangerous voltages or other  
risks. Incorrect assembly can cause electric shock when the product is subsequently used.  
12.Unplug this product from the wall and refer servicing to the factory service center personnel under the following condi-  
tions:  
a.When the power supply cord or plug is damaged or frayed.  
b. If liquid has been spilled into the product.  
c. If the product has been exposed to rain or water.  
d. If the product does not operate normally by following the operating instructions. Adjust only those controls that are  
covered by the operating instructions because improper adjustment of other controls may result in damage.  
e. If the product has been dropped or the cabinet has been damaged  
f. If the product exhibits a distinct change in performance.  
NOTE: SAVE THESE INSTRUCTIONS  
Unpacking  
Packing List  
The unit was carefully checked before leaving the factory.  
The Gold Seal Series carton contains the following components:  
1 - Gold Seal Series unit  
1 - User Manual  
1 - Product Registration Card  
Accessories  
The following accessories are available for your Gold Seal Amplifier at additional cost:  
• Model GSTRC — A plexiglass cover to protect control settings  
• Model GSRPK — Rack mounting installation kit.  
• Model GSRVC — A remote volume control to control volume of the amplifier from distances up to 1000 feet.  
2
 
Features  
Front Panel (All Models)  
3
4
7
8
1
2
5
6
9
10  
1. MIC 1 to 4 - Individual level controls for dedicated microphone inputs.  
2. MIC 5/TEL - Individual level control for Mic or Tel input depending on input mode selected.  
3. MIC 6/AUX 1 - Individual level control for Mic or Aux 1 input depending on input mode selected.  
4. AUX 2 - Individual level control for dedicated Aux 2 input.  
5. Contour - Enables or disables loudness equalization. Affects only Aux 2 and Mic 6/Aux 1 if set in aux mode.  
6. Band Dual Mode Equalizer - 10 band graphic EQ with dual center frequency ability.  
7. Dual Mode Equalizer Selector Switch - Selects EQ frequency bands or EQ defeat (OUT).  
8. MASTER - Master output level control.  
9. APHEX AURAL EXCITER - Enables or disables the Aphex Aural Exciter effect. Affects all input signals.  
10. POWER - AC Power switch.  
3
 
Features  
Rear Panel (GS-35, GS-60, GS-100 & GS-150)  
1
5
7
22  
14  
16  
18  
19  
20  
12  
17  
3
4
10  
9
11 6  
21  
15  
8
2
13  
1. Amplifier Output - Terminal strip containing all the Gold Seal output taps.  
2. VOX - Variable control for adjusting TEL input signal level trigger point for automatic muting of Aux input  
(works only in the TEL input mode).  
3. REMOTE MSTR - Screw terminal pair for connection of remote master volume control (Bogen model:  
GSRVC).  
4. MIC/AUX/TEL PRECEDENCE - Screw terminal connections that allow externally controlled muting of indi-  
vidual inputs.  
5. WMT-1A - RCA connection for Bogen model WMT-1A 600 ohm balanced line matching transformer.  
6. TAPE OUT - RCA unbalanced output, pre EQ and master volume.  
(Mics are post Lo-Cut filter, see #14 below).  
7. TO PWR AMP - RCA connection provides a high impedance, unbalanced signal level output as a feed to  
high impedance inputs of other external amplifiers.  
8. AX - Variable control for adjusting the amount of Aphex Aural Exciter effect.  
9. PRE OUT - RCA unbalanced output from preamp/mixer stage for connection to external signal processing  
equipment (used in conjunction with POWER IN and LINK switch).  
10. POWER IN - RCA unbalanced direct input to power amp stage for connection to external signal processing  
equipment (used in conjunction with PRE OUT and LINK switch).  
11. LINK - Switch that makes or breaks the internal connection between preamp/mixer stage and power amp  
stage for use with external signal processing equipment.  
12. AUX 2 - RCA unbalanced input for dedicated Aux 2 input.  
13. MIC 1 to 4 - Balanced XLR connectors for dedicated microphone inputs.  
14. LO CUT FILTER - Enables or disables low frequency roll off (65 Hz) for all microphone inputs.  
15. PHANTOM (MIC 1 to 4) - Individual switches enables or disables phantom power to each of the 4 dedicated  
microphone inputs (MIC 5 and MIC 6 phantom power selection — see page 6).  
4
 
Features  
Rear Panel (GS-250)  
18  
14  
21  
16  
1
22  
19  
20  
8
2
12  
6
17  
3
5
7
23  
10  
11  
4
9
15  
13  
16. MIC 6/AUX 1 - Switch selects either MIC 6 or AUX 1 connections as input.  
17. AUX 1 - RCA unbalanced input for Aux 1 input signal (works only when AUX 1/MIC 6 switch is set to AUX  
1).  
18. MIC 6 - Screw terminals for balanced microphone (active only when AUX 1/MIC 6 switch is set to MIC 6).  
19. MIC 5/TEL - Dual function Screw terminals for either balanced microphone or 600 ohm balanced input from  
telephone page port.  
20. MIC 5/TEL - Switch selects mode of operation for MIC 5/TEL input.  
21. ALC - Variable control to adjust the amount of automatic level control applied to the TEL input (works only in  
the TEL input mode).  
22. VAR MUTE - 4 Switch selectable levels of Aux input signal muting during TEL page (works only in the TEL  
input mode).  
23. Fan - 3 speed fan for efficient cooling (GS-250 only).  
5
 
Input Connections  
Installation Note  
source to the AUX 1 RCA jack (only works when the  
AUX 1/MIC 6 switch is in the AUX1 position).  
Keep input leads away from the output leads and  
AC power cables. Unless the driving source pro-  
vides a low-impedance output, keep the input lead  
under ten feet in length. Make all connections to  
the unit with the POWER switch in the OFF posi-  
tion.  
AUX 2  
The AUX 2 input uses an RCA plug  
and accepts input from a dedicated  
AUX source.  
MIC 1- 4  
Phantom Power for MIC 5 & MIC 6  
A single internal jumper is provided to supply phantom  
power to both MIC 5 and MIC 6. The amplifier is  
shipped with the jumper in the OFF position. See the  
figure below for the location of the phantom power  
jumper.  
1 — GND  
2 — +  
3 — -  
2
2
2
1
3
1
3
1
3
2
1
3
MIC 5 and MIC 6 input terminal strip  
MIC 1 through 4 utilize female XLR-type microphone  
connectors. A slide switch located above each XLR  
connector is used to supply phantom power for con-  
denser microphones.  
MIC 5/TEL  
The MIC 5/TEL input is designed to accept input from  
a microphone or from a telephone line. A slide switch  
is provided to select MIC 5 or TEL input. To connect a  
microphone, place the MIC 5/TEL switch in the MIC  
position. Use two conductor shielded cable and con-  
nect the cable shield to the center GND terminal. To  
use the TEL input, place the MIC 5/TEL switch in the  
TEL position and connect the 600 ohm telephone pag-  
ing source (dry signal only - no DC voltage) to the MIC  
5/TEL screw terminals.  
Phantom Power Jumper Location For  
Mic 5 and Mic 6  
Warning  
MIC 6/AUX 1  
Removal of the amplifier cover exposes internal  
components and presents an electrical shock haz-  
ard. For this reason, do not perform any functions  
requiring removal of the cover of the amplifier  
unless you are qualified to do so. Always discon-  
nect AC power from the unit before attempting to  
remove the cover.  
The MIC 6/AUX 1 input is designed to accept input  
from a microphone using terminal strip connections or  
from a high level auxiliary source such as a tuner or  
CD player using the AUX 1 RCA jack. A slide switch is  
used to select input type. Connect a microphone to the  
screw terminals labeled MIC 6 (works only when AUX  
1/MIC 6 switch is in the MIC 6 position). Use two con-  
ductor shielded cable and connect the cable shield to  
the center GND terminal. Connect an auxiliary input  
6
 
Input Connections  
Precedence Connections  
Remote Volume Control  
Precedence connections allow any combination of  
inputs to be completely muted with a contact closure.  
Closing a contact across any of the precedence termi-  
nals and the PREC COM 1 terminal will mute that  
input. A customer-supplied normally-open SPST  
switch, push-to-talk switch, microphone switch, relay  
or telephone system contact can be used to provide  
the closure.  
If remote volume control is desired, connect the Bogen  
accessory GS-RVC remote volume control to the  
screw terminals marked REMOTE MSTR. Wire length  
can be up to 1000 feet using 22 gauge wire.  
Note: Activating the precedence control for Aux  
inputs completely mutes the input signal. The  
VAR MUTE control has no effect when muting  
inputs using precedence control.  
7
 
Output Connections  
Output Terminal Strip  
To Power Amp  
The Gold Seal Series amplifier  
may be used to drive an external  
power amplifier (can only be  
used with unbalanced high  
impedance inputs).  
4Output LINK shorting clip  
Note: Shorting clip between GND/COM on the  
speaker output terminals strip must be installed to  
use this feature.  
Shorting Clip - Leave for unbalanced lines.  
Remove for balanced lines  
Speaker systems are connected directly to the speak-  
er output terminals on the rear panel. Connect one  
speaker lead to the COM terminal and the other to the  
terminal corresponding to the impedance of the speak-  
er system. Select only one of the output types.  
Pre Out/Power In Jacks  
These jacks permit the insertion  
of signal processing equipment  
into the signal path between the  
preamp output and the power  
amp input. The LINK switch  
should be in the IN position for  
normal operation. When using  
external signal processing  
For ground-referenced output operation (unbalanced  
systems), leave the shorting clip between COM and  
GND. For special applications that require floating out-  
puts (balanced systems), remove the shorting clip  
between COM and GND.  
equipment, place the switch in  
the OUT position and connect  
PRE OUT to the signal process-  
ing equipment’s input. Connect  
the POWER IN to the signal  
processing equipment’s output.  
To use the DIRECT OUT (4-ohm) output, remove the  
shorting clip across the LINK terminals and connect  
one lead to the 4terminal and the other to the GND  
terminal. The GND/COM shorting clip should remain in  
place.  
Tape Out  
The TAPE OUT jack provides a  
line level output to feed a tape  
recorder. The output is not  
effected by the Master volume  
control or EQ, however, the Lo-  
cut filter does affect the micro-  
phone inputs.  
Note:The WMT-1A and TO PWR AMP outputs  
cannot be used if speaker GND/COM shorting  
clip is not installed.  
WMT-1A  
This RCA output jack, when used  
with a Bogen WMT-1A Line  
Matching Transformer accessory  
provides a 600 ohm output to feed  
a remote amplifier or a telephone  
line. Refer to the instructions pro-  
vided with the WMT-1A accessory  
for connection information.  
Note: Shorting clip between GND/COM on the  
speaker output terminals strip must be installed to  
use this feature.  
8
 
Operation  
The rear panel AX adjustment controls  
the mix of the Aphex effect with the audio  
signal. Counterclockwise rotation of the  
control minimizes the Aphex effect.  
Clockwise rotation of the control maxi-  
mizes the Aphex effect.  
Power Switch  
The POWER switch applies  
power to the unit. The switch  
will illuminate when power is  
on.  
Dual Function Acoustic Equalizer  
The unique dual-function equalizer can be used for  
acoustic shaping or for feedback control.  
Individual Volume  
Controls  
Each input is controlled by an individual volume con-  
trol.  
The overall volume is controlled by the  
MASTER control.  
Lo-Cut Filter  
Note: When the switch is placed in the OUT posi-  
tion, the equalizer is bypassed for a flat response.  
The Lo-Cut filter on the rear panel  
provides 3dB attenuation @ 65Hz  
on the microphone inputs. This  
helps reduce mic breath pop, wind  
noise and rumble.  
Acoustic Shaping Mode  
When the switch is set in the ACOUSTIC EQ position,  
full range equalization (10 bands on 1 octave centers  
starting at 62.5Hz) is provided with a boost/cut of  
12dB. In this mode, the equalizer can be used to com-  
pensate for room acoustics, or to satisfy the listening  
preference of the user.  
Contour Pushbutton Switch  
This switch enables or bypasses  
the variable loudness contour.  
This feature only effects the Aux  
inputs.  
Feedback Control Mode  
When the switch is placed in the FEEDBACK CON-  
TROL position, the equalizer can be used to reduce  
feedback and increase the effective gain of the sys-  
tem.  
This feature is designed to improve richness of sound  
by restoring the high and low frequencies that the ear  
is insensitive to at low volume levels. The effect dimin-  
ishes as volume is increased.  
In feedback control mode the equalizer provides  
increased control of frequencies between 125Hz and  
8KHz. The 10 bands are located on 2/3 octave cen-  
ters with 12dB cut/boost on each band.  
Aphex Aural Exciter  
The front panel APHEX AURAL  
EXCITER pushbutton enables or  
bypasses the Aphex Aural  
Exciter feature. This feature  
effects all inputs when enabled.  
This audio enhancement system recreates the pres-  
ence and realism that is lost in the audio amplification  
process, by regenerating the harmonics usually lost  
through amplification. This results in increased pres-  
ence and clarity, increased intelligibility, greater per-  
ceived loudness (without adding extra power), and  
reduced listener fatigue.  
9
 
Operation  
VOX  
Telephone Paging Control  
The telephone page input features  
voice activated Aux muting. This  
feature always mutes AUX 2 and  
only mutes AUX 1 when the  
AUX1/MIC 6 is set in that position.  
The MIC 5/Tel volume control on the front panel con-  
trols the volume of the telephone paging input when  
the control is set to the Tel mode (See page 6 for infor-  
mation on setting the Tel input mode).  
The Tel input mode uses voice activated triggering for  
muting the AUX inputs and automatic level control for  
providing constant paging level. To optimize Tel input  
performance the ALC control may need to be adjusted.  
The VOX control should be set so that only the  
desired signal is above the threshold level, while  
unwanted noise or signal is below it.  
To adjust the sensitivity of the circuit:  
ALC  
1. Rotate the VOX control fully clockwise. While mak-  
ing a public address announcement and talking at a  
low level, the sound should not be choppy or miss-  
ing parts of words. If it is choppy or intelligibility is  
poor, rotate control counterclockwise to the point  
where the sound is clear and crisp (but not to the  
maximum counterclockwise position).  
2. If the background music shuts down when no page  
is in progress, rotate the control counterclockwise  
until the music will not shut down when no page is  
in progress.  
The telephone page input features an  
automatic level control (ALC) which  
compensates for different voice levels  
and speaking styles of the individuals  
using the system. The amplifier is  
shipped with this control in the OFF  
(max. counterclockwise) position.  
To adjust the ALC:  
1.Rotate the MIC 5/TEL and MASTER controls to the  
highest level likely to be used.  
2.Speak softly and distinctly into the telephone mouth-  
piece while adjusting the MIC 5/TEL volume control  
to the desired output level.  
3.Speak in a loud voice directly into the telephone  
mouthpiece while rotating the ALC control clockwise  
to the point where the output of the amplifier is  
reduced to the same level as that obtained in  
Step 2.  
VAR MUTE  
The VAR MUTE control mutes the  
Aux input(s) only during telephone  
pages.  
The control allows the user to select from 4 levels of  
muting: 1 = -60dB, 2 = -21dB, 3 = -10dB, 4 = 0dB.  
4.The MIC 5/TEL and MASTER controls can be used  
to vary the overall volume without upsetting the ALC  
adjustment.  
10  
 
Troubleshooting  
Amplifier will not turn ON.  
On the GS-35, GS-60, GS-100 and GS-150, depress the  
circuit breaker.  
On the GS-250, check the fuse. Replace fuse only with  
same type and rating.  
No output on 70V, 25CT, or 25V.  
Check that the LINK switch on the rear panel is in the IN  
position or external signal-processing equipment, if used,  
is functioning  
Make sure that the shorting clip on the DIRECT OUT 4Ω  
output is in place.  
No telephone output.  
Make sure that the MIC 5/TEL switch is in the TEL position.  
When connecting the telephone Tip & Ring, make sure to  
use the two outside terminals and not the center terminal  
(GND).  
Aux input will not mute with  
telephone page.  
Check that the VAR MUTE control is not set to 4 (0dB).  
This control adjusts the level of the background music  
when making a page. See page 10.  
Microphone squeals or hums when  
using the 3-pin connectors but not  
when using screw terminals.  
Check your wiring connections for the 3-pin connector.  
Pin 1 is the shield connection. Pins 2 and 3 connect  
to high and low leads on the mic cable.  
Condenser Mic will not work.  
Make sure that phantom power switch (MIC 1 - 4) is on.  
See page 6.  
Mic 5 and 6 use circuit board jumper. See page 6.  
Telephone input cuts off the music,  
without making a page.  
Adjust the VOX control on the rear panel to eliminate any  
unwanted noise that may be triggering the auto-mute circuit  
See page 10.  
Telephone input is choppy or  
cuts off the beginning of a page.  
Adjust the VOX control counterclockwise to make the  
trigger activate at a lower input signal level. See page 10.  
The telephone page volume is too  
loud on some pages.  
Adjust the ALC control on the rear panel. See page 10.  
AUX 1 input not working  
Make sure MIC 6/AUX 1 switch is in the AUX 1 position.  
Make sure the signal source is plugged into the AUX 1  
RCA jack.  
11  
 
Bogen Service  
Caution  
Warranty Service  
There are no user-serviceable parts within the  
amplifier. Have all internal servicing performed by  
a qualified technician. The warranty may become  
void if repairs are performed by other than the  
Bogen Factory Service Department.  
If you are shipping the unit for a warranty repair, pack  
it in the original shipping container or similar container  
and ship prepaid via any responsible carrier. Include a  
letter stating the problem and proof of purchase show-  
ing the purchase date. The amplifier will be promptly  
repaired and returned to you freight prepaid while in  
warranty.  
The Bogen Gold Seal Series Amplifier is covered by a  
3-year warranty and overnight installation-site replace-  
ment program (see below). If you encounter difficulty  
with your Bogen Gold Seal amplifier, please do not  
hesitate to ask our advice or assistance. Information  
can be obtained by calling our Application Engineering  
Department or Factory Service Department at (201)  
934-8500.  
Service After Warranty Has Expired  
If the amplifier requires service after the warranty has  
expired, ship it to us as per above, along with a letter  
giving us your name and address. We will examine the  
unit and contact you with an estimate of repairs before  
any repair is made. Return shipment of equipment not  
in warranty will be at the expense of the owner.  
Please be sure to fill out and return the product regis-  
tration card included with this unit.  
Best results are obtained when you:  
• Read the User’s Guide before operating  
• Ensure all input and output wiring is correctly  
installed. If using the 4-ohm output, be sure to  
remove the shorting clip in the LINK position (see  
instructions on page 7).  
• Ensure that the LINK switch (see the section on  
PRE OUT/POWER IN JACKS on page 7) is in the  
IN position when not using external signal pro-  
cessing equipment.  
For warranty service, refer to the product registration  
card. Our customer service support center can be  
reached at (201) 934-8500, extension 1310, weekdays  
from 9AM to 8PM, Eastern time. Or you can e-mail  
12  
 
Technical Specifications  
Power Rating (RMS):  
GS-35 —  
GS-60 —  
GS-100 —  
GS-150 —  
GS-250 —  
35 watts  
60 watts  
100 watts  
150 watts  
250 watts  
Frequency Response:  
Transformer Output —  
Direct —  
65Hz to 20KHz +0/-2dB @ -2dB  
20Hz to 20KHz, +0/-1dB @ rated power  
Distortion:  
Direct —  
0.5% (max.), 0.3% (typ.), 20Hz to 20KHz  
Transformer —  
Signal-to-Noise Ratio:  
Fundamental —  
Aux 1 & 2 —  
Tel —  
0.5% (max.), 0.3% (typ.), 65Hz to 20KHz @ -2dB  
-94dB or better;  
-70dB  
-70dB or better @ 600 ohms  
-60dB or better @ 200 ohms  
Mic 1 - 6 —  
Inputs/Outputs:  
Mic —  
6 Lo-Z balanced via 4 XLR connectors and 2 screw terminals.  
Sensitivity: 0.35mV (200Ω)  
2 Hi-Z RCA jacks. Sensitivity: 0.085V (10Kohms)  
Screw terminals. Sensitivity: 0.07V (600)  
5V @ Rated Output via RCA jack  
In 1V/Out 1V via RCA jacks  
25V @ Rated Output via RCA jack  
687mV @ Rated Output via RCA jack  
Aux—  
Telephone —  
Output to Power Amp —  
Power In/Pre Out —  
WMT-1A Output —  
Tape Output —  
Output Impedance:  
Output Regulation:  
Variable Mute Range:  
ALC:  
Balanced or unbalanced 8-ohms, 25V, 25VCT, 70V; 4-ohm direct unbal.  
Better than 2dB from no load to full load  
4 steps, -60, -21, -10, 0dB (Aux 1 & 2)  
Distortion - less than 0.5%; Compression - 25dB  
Input 20mV (VOX control max. CW position)  
-60dB (via terminal strip Mic 1, 2, 3, 5/Tel, 6/Aux, Aux 2  
+8dB @ 100Hz, +4dB @ 10KHz (Aux 1 & 2 control at 1/4 CW position)  
Type A9  
VOX Threshold:  
Mic Precedence:  
Loudness Contour:  
Aphex Aural Exciter:  
Overload Protection:  
Thermal Protection:  
Line Fusing:  
Electronic with automatic reset  
105°C (220°F) thermistor attached to heat sink  
Resettable circuit breaker (GS35/60/100/150),  
Slo-Blo Fuse 6A/125VAC (GS250)  
Dimensions:  
Shipping Weight:  
GS-35 —  
16.5”W x 3.5”H x 12”D All Models  
19 lbs  
24 lbs  
28 lbs  
31 lbs  
33 lbs.  
GS-60 —  
GS-100 —  
GS-150 —  
GS-250 —  
Bogen® is a registered trademark of Bogen Communications, Inc.  
APHEX® is a registered trademark of Aphex Inc.  
13  
 
50 Spring Street, Ramsey, NJ 07446  
Tel. 201-934-8500 Fax: 201-934-9832  
 

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