Page 11
Com-Tech Power Amplifiers
Reference Manual
Fig. 2.2 Rear Facilities
(Domestic Model Shown)
J. Dual/Mono Switch
For 8- and 4-ohm operation, remove the cover plate, if
so equipped, then slide this switch to the center for Dual
(two-channel) mode, to the left for Parallel-Mono mode
or to the right for Bridge-Mono mode.
WARNING: Do not change this switch unless the
amplifier is turned off. Do NOT use the Bridge-Mono
or Parallel-Mono modes unless both output mode
switches (O) are set the same.
Also, be sure to follow
the installation requirements for each mode (see Sec-
tion 3.3.1).
K. Remote Input
For remote operation, an RJ11 jack is used to connect
the amplifier to the optional R.S.V.P. (Remote Switching
Voltage Provider) module. Do not connect to phone line.
L. PIP Module
The standard
PIP2-BB is included with your amplifier. It
provides barrier block input connectors equipped with
test points for your DVM. Other PIP modules can be
used in place of the PIP2-BB to provide additional fea-
tures that customize the amplifier for different applica-
tions. First generation PIPs require the “PIP2
Adapter”
for accessory connectivity (see Section 8 for available
PIP modules).
M. Input Sensitivity Switch (not shown)
The three-position Input Sensitivity Switch located in-
side the amplifier is accessed by removing the PIP
module. It is set at the factory to 0.775 volts for maxi-
mum average power (1 kHz power into 8 ohms). It can
also be set to 0.775 volts for 1 kHz output in 70-volt
mode, or an overall voltage gain of 26 dB (see Section
4.4).
N. Input Attenuation Controls
Each channel’s output level can be adjusted accurately
using these 21-position detented controls on the back
panel. A Lexan cover is also included that can be used
to discourage tampering (see Section 4.4).
O. Balanced Barrier Block Inputs
The PIP2-BB is included in the standard configuration.
It provides a balanced barrier block with three termi-
nals for each input channel,
as well as
test points for a
DVM
. (XLR connectors are also available—see Section
8.1.)
P. Output Mode Switches
The output mode switches are used to configure each
channel independently for either 8/4-ohm loads or 70-
volt (“constant voltage”) lines.
WARNING: Do not change these switches unless the
amplifier is off. Do NOT use the Bridge-Mono or Par-
allel-Mono modes unless these switches are set the
same.
Also, be sure to follow the special installation re-
quirements for each mode (see Section 3.3.1).
Q. Output Barrier Block
A barrier block with four terminals is provided for output
connection. Output wiring will vary depending on the
selected dual/mono mode and whether 70-volt output
will be used (see Section 3.3.1).
