Bogen Gold Seal GS100 User manual

Gold Seal Series Amplifiers
Models GS-35, GS-60, GS-100, GS-150, GS-250
• 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
• 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)
• True loudness contour function
• Aphex® Aural Exciter for improved intelligibility
• Switchable phantom power supply
• Variable Aux input muting
• 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
• 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
• 3-speed fan cooling GS-250 only)
• Available tamper resistant front cover
• Available rack mounting kit
• Available remote volume control
Features
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 35W
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.
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© 1997 Bogen Communications, Inc.
50 Spring St., Ramsey, NJ 07446
Publication No. 54-5941-04
9903
Printed in Korea
All rights are reserved. No part of this document may be
photocopied, reproduced, or translated to another language
without the prior written consent of Bogen Communications
Inc.
Notice: The information contained in this document is sub-
ject to change without notice and should not be construed
as a commitment by Bogen Communications, Inc.
Bogen Communications, Inc. assumes no responsibility
for any errors that may appear in this document nor
does it make an expressed or implied warranty of any
kind with regard to this material, including, but not lim
ited to, the implied warranties of merchantability and
fitness for a particular purpose.
Bogen Communications Inc. shall not be liable for incidental
or consequential damages in connection with, or arising out
of the furnishing, performance, or use of this document and
the equipment which it describes.
Complete product warranty information is provided on a
separate product registration card.
WARNING
The Warning label calls attention to a procedure, practice,
or the like, which, if not correctly performed or adhered to,
could result in damage to the unit or personal injury. Do
not proceed beyond a warning label until the indicated con-
ditions are fully understood and met.
Warning: Changes or modifications to this unit not
expressly approved by the party responsible for compliance
could void the user’s authority to operate the equipment.
Bogen® is a registered trademark of Bogen Communications, Inc.
APHEX® is a registered trademark of Aphex Inc.

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)
1 2 56 9 10
8
7
43
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. 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).
34
1 5 7 22 14 16 18 19 20
10 911 6821 2
12
17 13 15
4

Features
Rear Panel (GS 250)
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).
34
1
5 7
22
14 16 18 19 20
1023 911
6
821 2
12
17 13 15
5

Installation Note
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 OWER switch in the OFF posi-
tion.
MIC 1 4
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.
MIC 6/AUX 1
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
source to the AUX 1 RCA jack only works when the
AUX 1/MIC 6 switch is in the AUX1 position).
AUX 2
The AUX 2 input uses an RCA plug
and accepts input from a dedicated
AUX source.
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.
Warning
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.
Input Connections
Phantom Power Jumper Location For
Mic 5 and Mic 6
6
1
2
3
1
2
3
1
2
3
1
2
3
1 — GND
2 — +
3 — -
Front
MIC 5 and MIC 6 input terminal strip

7
Input Connections
Remote Volume Control
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.
Precedence Connections
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.
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.

8
Output Terminal Strip
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.
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.
To use the DIRECT OUT 4-ohm) output, remove the
shorting clip across the LINK terminals and connect
one lead to the 4Ωterminal and the other to the GND
terminal. The GND/COM shorting clip should remain in
place.
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.
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).
Note: Shorting clip between GND/COM on the
speaker output terminals strip must be installed to
use this feature.
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
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.
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.
Output Connections
Shorting Clip - Leave for unbalanced lines.
Remove for balanced lines
4ΩOutput LINK shorting clip