User guide
2. Insert the wired connector into the amplifier output and secure the locking screws
on either side.
OUTPUT
70V
h
High pass lter toggle switch — Use a small screwdriver to toggle this recessed
two-position toggle switch that alternates between Off and 80 Hz. Setting the switch
to 80 Hz prevents the saturation of 70 V/100 V speaker input transformers by low
frequency signals. Saturation may result in undesired overheating of the speaker
transformers.
NOTE: Filtering may be unnecessary if filtering is applied to the source input signal
upstream of the amplifier.
Remote Volume Control
Options for remote control of the XPA amplifiers include the Extron VCM 100 and VC 50
volume controllers. Third party 10k potentiometer volume controllers can also be connected
to this port.
As shown in the following illustration, the remote connector pin 1 is a 10 VDC reference
voltage. Pin 2 is volume control DC voltage, range is 0 to 10 V, where 0 V is mute and 10 V
provides maximum volume. Pin 3 is ground.
NOTE: All nominal levels are at ±10%.
VOL/
MUTE
10V
REMOTE
Red
Black
Ground
Extron
STP 22
Cable
VOLUME
VCM 100
MUTE
123 45
STANDBY
VOL/MUTE
10V 50 mA
Figure 7. Pinout Diagram for VCM 100 MAAP Connection
XTRA Series Power Ampliers • Installation and Operation 11