Bogen C10 User Manual

N.

MODEL CIO

Challenger Solid Siate Series

OPERATING AND INSTALLATION MANUAL

DESCRIPTION

Bogen Model CIO is a fully transistorized public address
amplifier rated at 10 watts. The unit will accommodate one
high impedance microphone and one auxiliary program
source such as a tuner, tape recorder, or phonograph with
ceramic cartridge. Individual controls are provided for the
microphone and auxiliary inputs along with a treble control
for adjustment of tonal balance.

Balanced or unbalanced outputs are provided for 4, 8, and

16-ohm speakers, and 25-Volt (62.1 ohms) or 70-volt (490

ohms) constant-voltage systems. A terminal strip with screw

terminals allows convenient connection of speakers, except
70-volt. For 70-volt operation, a quick-disconnect speaker
socket is provided.

The CIO operates from a 120-volt, 60Hz source and has
a maximum power consumption of 46 watts. A thermostat
enclosed in the power transformer protects the amplifier
against overloads.

INSTALLATION

10-WATT TRANSISTOR

PUBLIC ADDRESS AMPLIFIER

— TECHNICAL SPECIFICATIONS

POWER OUTPUT; 10 Watts.

FREQUENCY RESPONSE: 80 to 10,000 Hz ±2 dB.

HUM AND NOISE:

MIC Input 60 dB below rated output.
AUX Input, 70 dB below rated output.

SENSITIVITY: MIC Input 3 mV; AUX Input 0.3V
INPUTS: 1 Hi-Z MIC convertible to Lo-Z balanced

(150-200 ohms) with IT-1 accessory, AUX Input
Hi-Z. Provision for WMT-1,

OUTPUTS: Speaker 4, 8, and 16-ohms, 25 volt (62.1

ohms), and 70 volt (490 ohms) line. Screw

terminals on terminal strip for speaker

connections.

TONE CONTROL ACTION;

TREBLE 10 kHz,-11 dB.

CONTROLS: Microphone Volume, AUX Volume,

Treble.

SEMICONDUCTORS; AU Silicon, 7 Transistors 4

Diodes

POWER CONSUMPTION; 46 W, 120 VAC, 60 Hz,

DIMENSIONS: 11-3/8” W x 2-7/8” H x 7-3/4” D.
WEIGHT: 5 lbs.

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UNPACKING

The amphfier was carefully checked before leaving the
factory. Inspect shipping container and unit carefully for
indication of improper handling; if the unit has been
damaged, make an immediate claim to distributor from
whom it was purchased, or if the amplifier was shipped

directly to you, notify transportation company without

delay and place your claim.

POWER AND GROUNDING

The amplifier is furnished with an ac line cord

terminated in a three-prong plug. The line cord should be

plugged into a three wire grounded outlet providing a

nominal 120-volt,.60 Hz power source. This will ground the
amplifier as well as supply power to it.

It is important to ground the amplifier. Therefore, if a
three-wire outlet is not available, an adapter such as Levitón
No. 5017 should be used to convert a standard two-wire

outlet for use with three-wire plugs. The adapter is provided
with a grounding pigtail which should be connected to the
screw holding the wall plate to the receptacle.

In some areas, the wall plate screw is not grounded. In

this case it will be necessary to connect a grounding wire
from the GND terminal on the rear chassis of the amphfier
to a water or steam pipe.

INPUT CONNECTIONS

MICROPHONE: Connect the microphone to the MIC

receptacle on the rear panel.

The microphone should be of the high-impedance
ceramic, or dynamic type. Connect the microphone as
shown in figure 1. The length of the interconnecting cable
should be under 35 feet. Where longer lines are necessary, a
low impedance microphone should be used along with
Model IT-1, in-line type microphone transformer.

MICROPHONE PRECEDENCE: Microphone precedence

may be accomplished by connecting the circuit shown in

PRINTED IN U5.A.

6-76

LEAH StEGLER, INC.

BOGEN DIVISION

/ Ю. aoxsm

/ PAKAUUS.N. J.t7IS2

54-5615-05

HI z

MItPOPHOHE

fSHURE 4aO OR

for 70V OPERATION

FOR 25 V OPERATION

OR SELECTED IMPEDANCES

Figure 2 — Microphone Precedence Circuit

figure 2. The equipment consists of a microphone, a
Y-adapter (Switchcraft Part No. 330F1), a single-conductor

shielded cable (20 feet maximum length) and a SPOT
switch. If the microphone switch has an extra set of contacts
for controlling an external circuit, such as on the Shure
Model 450, the SPOT switch is not required.

Plug the Y-adapter into the AUX input jack on the rear
of the amplifier. Connect the program source and precedence
switch to the Y-adapter, as shown in the figure. Connect
the microphone input to the MIC input jack.

PHONO; Connect a phonograph (with ceramic cartridge) to

the AUX jack, using a single-conductor shielded cable

terminated in a standard RCA phono plug. It is recom
mended that a separate ground wire be connected between
the phono player base and the amplifier GND terminal to
minimize hum pick-up.

TUNER, TAPE, ETC.: The AUX input may be used for

souices other than a phonograph. Any signal soprcc having

a highdevel (.15-3V) output may be connected to these
inputs. This includes such Bogen equipment as the Model
BRC 3-speed automatic record changer, and Model TP160
AM/FM tuner.

OUTPUT CONNECTIONS

Figure 3 — Speaker Output Plug Wiring

When the speaker socket is used, connect the wired plug
to the socket. Attach the impedance selector lead to the
output terminal which corresponds to the speaker system
impedance. For 70-volt operation, it is only necessary to
connect the wired plug to the quick-disconnect speaker
socket, leaving the impedance selector discormected. Note
that the arrangement in figured is for unbalanced speaker
lines, with the link between COM and GND closed. For
balanced lines, open the link between COM and GND.

NOTE

For balanced output lines, remove the link

between COM and GND output terminals. If
the line is shielded, connect the shield to GND.

CONNECTING AMPLIFIERS IN SERIES

Pairs of Bogen CIO amplifiers can be connected in series

to effectively double the power output into the same
speaker system. See figure 4 for connection diagram. Be
certain to remove the link between COM and GND of
amplifier No. 2. Note that this arrangement is for
unbalanced speaker lines. For balanced lines also remove
the link between COM and GND of amplifier No. 1.

( ^

SPEAKERS: The amplifier may be uspd with speaker

systems rnteri at 4, S and 16 ohms and with 25-volt and

70-volt constant voltage^systems. For detailed information
on the installation of multiple speaker systems, refer to the

Speaker Installation Bulletin (no. 54-5001) included.

In permanent installations, where speakers will remain

connected to the amplifier, connect the speaker system
directly to the Speaker Output terminals on the rear of the

amplifier. Connect one speaker lead to the COM terminal
and the other to the terminal corresponding to the im
pedance of the speaker system.

CAUTION

To minimize shock hazard. Class 1 wiring as
defined in local building codes should be used
for 70-volt outputs. All other outputs may use
Class 2 wiring.

The input cabling must be arranged to parallel the inputs
of the two amplifiers, and the volume and tone controls of
both amplifiers must be at the same setting to assure that
each amplifier will share the load equally.

AMPLIFIER I

GND COM 1641

Figure 4 — Connecting Amplifiers in Series

-2-

AMPLIFIER 2

GND COM 1641

25V
20 W