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LED will illuminate for approximately 3 seconds during power switch-on and switch-off. It is normal for this LED
to glow while continuing to monitor the internal conditions for about 3 seconds after the protection relay has
closed. It will also illuminate during any internal fault condition. If this happens, turn the amp off and consult a
repair technician.
• The “thermal LED indicates that the amplifier has overheated, engaged the protection circuit and shut down.
This circuit is self-resetting when the offending condition (blocked air vents, foreign body stuck in fan, etc) is
corrected. This LED will also flash for a brief time at turn-on and turn-off, indicating that the amplifier protection
circuits are operating. An additional feature of this LED is that it will illuminate about 15 degrees F. before
amplifier thermal shut-down, as a reminder that the operating conditions are too hot.
• The “signal LED indicates that the power amplifier is receiving signal (over several watts output) and all
is well!
• The “limit LED indicates that the power amplifier has reached maximum power and the limiter threshold
has been crossed. Driving 6dB beyond this point, the amplifier will gradually begin to clip.
• The “output limit switch engages or bypasses the internal soft clip limiter. This limiter allows simulation of
output saturation as the amplifier nears its maximum power. The limiting action is particularly musical
sounding, even when driven hard.
REAR PANEL
FEATURES
Direct Output — This is a studio quality, fully active transformerless balanced “direct output, with “pre-post
equalization switch.
With the “pre/post switch in the “pre” position, the direct output receives its signal directly from the pre-amp
input buffer amplifier with no tonal modifications. This is a pre gain control, pre eq output, with the best signal
to noise ratio. Most recording and sound reinforcement companies will want to use this position since changes
you make to your stage sound will not affect this output.
With the “pre/post switch in the “post” position, the direct output receives its signal from the output of the 5
band equalizer. This feature allows for additional flexibility in some situations, but is often not desired for
recording or live sound reinforcement.
A “ground lift switch is provided which opens pin 1 (shield) on the direct output to prevent ground loops. Use
the position that results in a minimum of noise.
The output level is nominal line level (adjustable to –30 or 0 dB), pin 2 hot. This output is fully protected from
the effects of phantom power provided by the mixing console and does not require phantom power to operate.
Effects Insert Jacks — The “effects insert jacks are provided to allow access to the pre-equalization signal
for the purpose of inserting signal processing equipment such as compressors, chorus, delay & reverb
processors. “Send (output) and “return (input) are nominal +4 dB level. “Series” devices (such as
compressors and gates) require that the signal flow out from the send jack on the amplifier, through the
processing device and back into the return jack on the amplifier. Parallel or mixed signal devices (such as