Bogen C60 User Manual

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Classic Series Amplifiers

C35, C60, & C100 Models

Installation and Use Manual

© 2003 Bogen Communications, Inc. All rights reserved.

Specifications subject to change without notice. 54-5979-02B0307 Printed in Korea.

Notice

Every effort was made to ensure that the information in this guide was complete and accurate at the time of printing. However, information is subject to change.

Important Safety Information

WARNING: To Reduce The Risk of Fire Or Electric Shock, Do Not Expose This Apparatus To Rain Or Moisture.

Always follow these basic safety precautions when installing and using the unit:

1. Read these instructions.

2.Keep these instructions.

3.Heed all warnings.

4.Follow all instructions.

5.Do not use this apparatus near water.

6.Clean only with dry cloth.

7.DO NOT block any ventilation openings. Install in accordance with the manufacturer’s instructions.

8.Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.

9.Do not defeat the safety purpose of the polarized or grounding-typeplug. A polarized plug has two blades with one wider than the other. Agrounding-typeplug has two blades and a third grounding prong. The wide blade, or the third prong, are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.

10. Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.

11. Only use attachments/accessories specified by the manufacturer.

12. Unplug this apparatus during lightning storms or when unused for long periods of time.

13. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

IMPORTANT

CAUTION: TO PREVENT THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER-SERVICEABLEPARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.

The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

Contents

 

 

Page

PANEL DESCRIPTIONS..................................................................................................

2-3

Classic Series Front Panel..................................................................................................................

2

Classic Series Rear Panel ..................................................................................................................

3

INSTALLATION ..................................................................................................................

4

Package Contents ................................................................................................................................

4

Ventilation..............................................................................................................................................

4

Rack Mounting......................................................................................................................................

4

CONNECTIONS..................................................................................................................

5

Input Connections ..............................................................................................................................

5

Microphone Connections ..............................................................................................................

5

Auxiliary ..........................................................................................................................................

5

AUX Muting....................................................................................................................................

5

TEL ..................................................................................................................................................

5

Output Connections ..........................................................................................................................

5

Speakers, General ..........................................................................................................................

5

Speakers, Low-Impedance ............................................................................................................

5

Tape/Booster Connection ..............................................................................................................

5

WMT1A Connection......................................................................................................................

5

OPERATION ....................................................................................................................

6-7

Front Panel Controls ..........................................................................................................................

6

Power ..............................................................................................................................................

6

Input Volume Controls ....................................................................................................................

6

MIC2, AUX1 Mode Switch............................................................................................................

6

Base and Treble Controls ..............................................................................................................

6

Rear Panel Controls............................................................................................................................

7

TEL Volume Control ........................................................................................................................

7

VOX SENSitivity Control ................................................................................................................

7

SPECIFICATIONS ..............................................................................................................

8

TROUBLESHOOTING........................................................................................................

9

WARRANTY ......................................................................................................................

10

ACCESSORIES ..................................................................................................................

10

Panel Descriptions

Classic Series Front Panel

1. MIC1 Level Control

Individual level control for a dedicated microphone input.

2. MIC2/AUX1 Mode Switch

Switch selects either the MIC2 or AUX1 connection as the active input.

3. MIC2/AUX1 Level Control

Individual level control for a dedicated microphone input or for an auxiliary input depending on input mode selected.

4.AUX2 Level Control

Individual level control for a dedicated auxiliary input.

5.Treble Control

Controls the amount of cut or boost of treble frequencies above 10 kHz.

6. Bass Control

Controls the amount of cut or boost of bass frequencies below 100 Hz.

7. Power

AC Power switch. Illuminates when ON.

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Panel Descriptions

Classic Series Rear Panel

1.Amplifier Output

Screw terminal strip containing all available speaker outputs.

2.Tape/Booster

RCA unbalanced signal level/output.

3.WMT1A

RCA output connection for Bogen’s 600-ohmbalanced line matching transformer Model WMT1A.

4.AUX Terminal

Screw terminal connection that allows externally controlled muting of AUX inputs with a contact closure.

5. Microphone Inputs

Screw terminal strip containing the MIC1 and MIC2 balanced, low-impedanceinputs. (MIC2 isswitch-selectable.)

6.Auxiliary Inputs

RCA unbalanced,AUX1 and AUX2 high-impedanceinputs. (AUX1 isswitch-selectable.)

7.TEL Input

Screw terminal input for 600-ohmbalanced telephone signal.

8.VOX SENS Control

Variable control for adjusting TEL input signal level trigger point for automatic muting of Aux input.

9.TEL Volume Control

Adjusts the telephone input paging level.

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Installation

Package Contents

Classic Series Amplifier

Instruction Manual

Ventilation

When using a shelf or table mount, the amplifier should stand alone with no equipment on top of it or below it. If the amplifier must be stacked with other equipment, care must be taken to ensure that all the minimum clearance distances (1/2") are met and that the equipment below the amplifier produces little significant heat.

Rack Mounting

A rack mount bracket kit (Model RPK50) is available as an accessory. (Not included.)

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Connections

Input Connections

Microphone Connections

These inputs are for two low-impedancebalanced dynamic microphones. Connect cable shield to center screw marked "GND."

Auxiliary

AUX2 AUX1

The AUX inputs provide unbalanced RCA inputs for connection to external signal-levelequipment.

AUX Muting

For this function, a customer-supplied,normally-opencontact closure

(switch) must be connected to the AUX 2 MUTE terminals. When the contacts are closed, the AUX 2 input will be muted.Typically activated by

a switch in a push-to-talkstyle microphone. AUX 1, if selected, is not mutable by contact closure.

TEL

Connect the telephone line to the two outside terminals and the shield,

if used, to the center terminal. TEL input signal will trigger automatic muting of AUX 1 and AUX 2. Input impedance is 600-ohmand is trans-

former balanced. Input is for "Dry" audio signals only, no DC voltage on the signal.

Output Connections

Speakers, General

The amplifier may be used with most conventional speaker sys-

tems. Connect one speaker lead to the screw terminal that corresponds to the impedance of the type of speakers used in the

system and the other lead to the COM terminal. If the line is shielded, connect the shield to GND.

Connecting the GND to the COM terminal when using the trans- former-coupledoutputs references the transformer output to ground. Disconnecting the GND terminal from COM allows the transformer output to float electrically. This is sometimes useful under certain conditions where a ground connection is undesirable. It is generally a good idea to short the GND to the COM terminal regardless of output type (Trans or Direct).

Speakers, Low-Impedance

To connect a 4-ohmspeaker, remove the the4-ohmlink and connect the speaker between4-ohmand GND.

Tape/Booster Connection

To tape record the amplifier program, connect a patch cord from the TAPE/BOOSTER output jack to the input of a tape recorder. Can also be connected to the input of a booster amplifier.

WMT1A Connection

This output jack is directly connected to the 25V speaker tap and permits the connection of Bogen’s general-purposematching transformer (WMT1A).The WMT1A steps the signal down by a 5:1 ratio, giving you a600-ohmbalanced signal that can drive long cable runs.

5

Operation

Front Panel Controls

Power

The front panel ON/OFF switch applies power to the amplifier and is illuminated when power is ON.

Input Volume Controls

Each input module may be individually controlled by its corresponding volume control knob.

MIC2,AUX 1 Mode Switch

Activates the corresponding input that it is switched to - MIC2 or AUX1.The other input is inactive and any connections to the inactive input will not work.

Bass and Treble Controls

The Bass and Treble controls are used to adjust the tonal balance of the amplifier output. The center position of these controls provides flat frequency response. Counterclockwise rotation of these controls reduces the bass or treble response, while clockwise rotation increases such response.

The treble control has a cut/boost range of +/- 11 dB at frequencies above 10 kHz and provides a roll off after 20 kHz to reduce gain above the audio range.

The bass control has a cut/boost range of +/- 11 dB at frequencies below 100 Hz. When driving speakers using the direct-coupledoutput terminals, the bass filter’s response is flat to 20 Hz.

6

Operation

Rear Panel Controls

TEL Volume Control

The TEL VOLUME control on the rear panel adjusts the TEL input’s paging level. It does not affect the microphone level. Rotate the control counterclockwise to decrease the level. Rotate the control clockwise to increase the level.

VOX SENSitivity Control

When an input signal (such as voice) is detected through the TEL input, the music channels (AUX1 and AUX2) will be muted. The VOX SENSitivity control should be set so that only the desired signal is above the threshold level, while noise and unwanted signal is below it.To adjust the sensitivity of this circuit:

1. Rotate the control fully clockwise. While making a page announcement and talking at a low level, the sound should not be choppy nor missing parts of words. If it is choppy, or if intelligibility is poor, rotate the 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 clockwise until the music is restored.

7

Specifications

Power Output (RMS)

 

C35:

35W

C60:

60W

C100:

100W

Frequency Response

 

& Distortion

 

Transformer:

70 - 16 kHz (± 2 dB) @ 1% max.

4-OhmDirect Output:

20 - 20 kHz (± 1 dB) @ 0.5% max.

Hum and Noise

 

MIC Input:

55 dB below rated output

AUX Input:

70 dB below rated output

TEL Input:

70 dB below rated output

Tone Control Action

 

Bass:

+/- 11 dB @ 100 Hz

Treble:

+/- 11 dB @ 10 kHz

Input Sensitivity

 

MIC Lo-ZBalanced:

600 µV

AUX:

85 mV

TEL:

75 mV

Outputs

8, 16 ohms, 25V, and 70V transformer-isolatedbalanced or unbalanced; 4 ohms

 

direct unbalanced

Output Connections:

Speaker screw terminal strip,TAPE/BOOSTER jack;

 

WMT1A jack

Input Connections:

(2) MIC Lo-Zterminals; (2) AUXHi-Zjacks,Tel

Controls:

MIC1, MIC2/AUX1 (switch selected),AUX 2, BASS,TREBLE,TEL,VOX

Power Requirements:

120V AC, 60 Hz

AC Line Draw

 

C35:

85W

C60:

148W

C100:

220W

Dimensions:

141/2" W x 33/4" H x 11" D (all models)

Product Weight

16 lb.

C35:

C60:

18 lb.

C100:

20 lb.

Measured @ 2 dB below FRP

All specifications subject to change without notice.

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