Bogen CHALLENGER SOLID STATE SERIES C10 - Manual (Page 2)

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.
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.
( ^
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
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.
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.
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
AMPLIFIER 2
GND COM 1641
25V
20 W
Figure 4 — Connecting Amplifiers in Series
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