User guide
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Limiter/Protect indicator LED — This LED (representing the output channel) lights red
under four circumstances:
When the output wiring is shorted together
When audio clipping occurs, the LED blinks once per clip occurrence.
When the amplifier overheats, the LED is lit. The LED is not lit after the amplifier
cools down and recovers from the overheated condition.
When DC output is detected, the amplifier is malfunctioning and the LED is lit.
When a malfunction occurs, power down the amplifier and power it back up. If the
LED still remains lit, the amplifier requires servicing.
See item
Ö
of “Front Panel Features and Operation” in this section.
Ñ
Signal indicator LEDs (channels 1 and 2) — These LEDs (representing input channels
1 and 2) light green only when an input signal is detected on the corresponding
channel.
12
LIMITER/
PROTECT
SIGNAL
See item
Ü
of “Front Panel Features and Operation” on page 4 in this section.
Ö
Signal indicator LED — This LED (representing the input channel) lights green only
when an input signal is detected.
d
Level adjustment (channels 1 and 2) — Use a small flat blade screwdriver to adjust
the audio input level for the corresponding channel. The analog potentiometers control
the level from -
=
(full attenuation) to 0 dB (no attenuation).
NOTE: On the XPA 2001, a single control simultaneously adjusts the levels of both
channels prior to summing them together.
XPA Input Level Adjustment:
1. If connecting to a source device with a volume control (variable output), ensure the
volume on the source device is set to its lowest point, then adjust the levels of the
XPA amplifier fully counterclockwise (–
=
).
2. Now set the source volume to its maximum volume level. No sound should be
heard.
3. Return to the XPA amplifier and raise the levels until sound distortion occurs, then
lower the levels slightly until any distortion disappears. This setting ensures that,
regardless of the source device volume setting, no clipping occurs.
NOTE: When setting volume control through a source device, ensure the
volume of the device is set to variable out. Consult the user manual
for the device for detailed instructions on its calibration.
XTRA Series Power Ampliers • Installation and Operation 7