Extron Electronics XTRA Series - Manual (Page 23)

h High pass filter (HPF) toggle switch (XPA 2001 series) — Use a small
screwdriver to toggle this recessed two-position switch. Setting the switch to 80 Hz
(default) prevents the saturation of 70 V and 100 V speaker input transformers by
low frequency signals. Saturation can result in severe distortion of the speaker output
signal.
HPF
80 Hz
OFF
or
80 Hz
HPF
OFF
NOTES:
• The filter may be safely turned off if high pass filtering is applied to the
source input signal upstream of the amplifier. Otherwise, it should be left on.
• The high pass filter toggle switch may be labeled one of two ways. The
wiring and function are the same, whichever way your product is labeled.
Remote Volume Control
Options for the 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, pin V (1) on the XPA is a 10 VDC reference voltage.
Pin C (2) is the volume control DC voltage input. The range is 0 to 10 V, where 0 V is mute
and 10 V provides maximum volume. Pin G (3) is ground.
NOTE: All nominal levels are at ±10%.
VOL/ MUTE 10V
Red
Black
Ground
Extron
STP 22
Cable
VOLUME
VCM 100
MUTE
1 2 3 4 5
STANDBY
VOL/MUTE
10V 50 mA
or
REMOTE
G
G C V
10V 50mA
ST
ANDBY
Figure 8. Pinout Diagram for VCM 100 MAAP Connection to XPA Remote
Connector
XTRA Series Half-Rack Audio Power Amplifiers • Operation 17