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GENZ BENZ - Model 250/500 Bass Amplifier (Page 6, Rev: 1/14/2006)
signal. On the processing unit, you will use the mixed signal output to return the signals (both wet
and dry) to the return jack on the amplifier. The ratio between the wet signal and the dry signal is
heard as the amount of effects added back to the original signal which is controlled by the mix
knob (also called “balance”) on the effects processor. This may be a real knob (as in the Alesis
Microverb), or software controlled (as in the Yamaha SPX-90, SPX900 or SPX 990).Set the input
sensitivity on the effects processor according to the processor manufacturer’s instructions.
The effects send jack may also be used as an auxiliary output to drive a direct box, tape deck etc.
This output is pre-equalization, and pre master volume. The mute switch will shut this output down
when engaged.
Master Volume -
The master volume control is post-eq, and adjusts the signal level sent to the power amplifier. Best
results are usually obtained when this control is set between the 9 o’clock and 3 o’clock position.
Master Section Status Indicators -
The power LED indicates that the amplifier is on and the low voltage regulated power supplies are
active.
The protect LED indicates that the amplifier is in “protect” mode and the output relay is de-
energized. This LED will illuminate for approximately 3 seconds during power switch-on and
switch-off. It will also illuminate during any internal fault condition.
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) 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
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 it’s maximum power. The limititing action is
particularly musical sounding, even when driven hard.
Direct Output -
The 250/500 series amplifiers includes a studio quality, fully active transformerless balanced
direct output, with pre-post equalization switch.
With the pre/post switch in the “out” 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 “in” position, the direct output receives its signal from the output of
the 4 band equalizer. This allows for additional flexibility in some situations but is often not desired
for recording or live sound reinforcement.