Bogen GS-250 User Manual

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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-poweredamplifier 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)

• Remote master volume control capability

• 1 selectable Mic/Tel input

• Input muting via contact on all inputs

• 1 selectable Mic/Aux input

• Voice activated aux muting on Tel input

• 1 dedicated Aux input

• Automatic level control on Tel input

4-ohmdirect coupled output

• Aux fade back after Tel page

8-ohm,25V, 25VCT, and 70V transformer-

• Preamp out/Power amp in connections

coupled outputs

• Booster amp output connection

• 35W, 60W, 100W, 150W and 250W versions

• Tape output connection

• Rack mountable — 2RU package for all models

• Balanced line driver output (using

• Dual function 10-bandgraphic equalizer (Acoustic

WMT1A accessory)

EQ/Feedback Control)

Lo-cutfilter for Mic channels

• True loudness contour function

3-speedfan cooling(GS-250only)

• Aphex® Aural Exciter for improved intelligibility

• Available tamper resistant front cover

• Switchable phantom power supply

• Available rack mounting kit

• Variable Aux input muting

• Available remote volume control

Downloaded from: http://www.guardianalarms.net

© 1997 Bogen Communications, Inc.

50 Spring St., Ramsey, NJ 07446

Publication No. 54-5941-049903

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 subject 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 limited 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 conditions 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/PowerIn Jack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.8

Tape Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.8

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.9

Power Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.9

Individual Volume Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.9

Lo-CutFilter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.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-ininstallation unless proper 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-prongplug 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 conditions:

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

3

4

10

9

11

6

8

21

2

17

13

15

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 individual inputs.

5.WMT-1A- RCA connection for Bogen modelWMT-1A600 ohm balanced line matching transformer.

6.TAPE OUT - RCA unbalanced output, pre EQ and master volume. (Mics are post Lo-Cutfilter, 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)

1

14

22

8

21

2

16

18

19

20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12

 

 

 

 

 

 

 

 

 

 

6

 

 

3

4

5

7

23

10

9

11

17

13

15

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-250only).

5

Input Connections

Installation Note

Keep input leads away from the output leads and AC power cables. Unless the driving source provides a low-impedanceoutput, keep the input lead under ten feet in length. Make all connections to the unit with the POWER switch in the OFF position.

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.

MIC 1- 4

 

 

 

 

1

— GND

 

 

 

 

2

— +

2 1

2 1

2 1

2 1

3 — -

3

3

3

3

 

 

 

 

MIC 1 through 4 utilize female XLR-typemicrophone connectors. A slide switch located above each XLR connector is used to supply phantom power for condenser 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 connect 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 paging 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 conductor shielded cable and connect the cable shield to the center GND terminal. Connect an auxiliary input

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.

MIC 5 and MIC 6 input terminal strip

Phantom Power Jumper Location For

Mic 5 and Mic 6

Warning

Removal of the amplifier cover exposes internal components and presents an electrical shock hazard. For this reason, do not perform any functions requiring removal of the cover of the amplifier unless you are qualified to do so. Always disconnect AC power from the unit before attempting to remove the cover.

Front

6

Input Connections

Remote Volume Control

Precedence Connections

If remote volume control is desired, connect the Bogen accessory GS-RVCremote volume control to the screw terminals marked REMOTE MSTR. Wire length can be up to 1000 feet using 22 gauge wire.

Precedence connections allow any combination of inputs to be completely muted with a contact closure. Closing a contact across any of the precedence terminals and the PREC COM 1 terminal will mute that input. A customer-suppliednormally-openSPST switch,push-to-talkswitch, 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.

7

Output Connections

Output Terminal Strip

4Ω Output LINK shorting clip

Shorting Clip - Leave for unbalanced lines.

Remove for balanced lines

Speaker systems are connected directly to the speaker 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 speaker system. Select only one of the output types.

For ground-referencedoutput operation (unbalanced systems), leave the shorting clip between COM and GND. For special applications that require floating outputs (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 4Ω terminal and the other to the GND terminal. The GND/COM shorting clip should remain in place.

Note:The WMT-1Aand 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-1ALine Matching Transformer accessory provides a 600 ohm output to feed a remote amplifier or a telephone line. Refer to the instructions provided with theWMT-1Aaccessory 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 processing 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 Locut filter does affect the microphone inputs.

8