(3) Gain Controls
The level of each Channel is individually adjusted by these controls.
Rotating these controls fully clockwise, results in no attenuation to the incoming audio
signals.
(4) Indicator Section, Signal levels:
These show the (Peak) output level of the amplifier for each channel, in both
Stereo and Mono modes. These will start to illuminate when a signal is present at the
speaker sockets when driven above a threshold of approximately -9db. Note that for
levels below this amount the led may not illuminate. The signal level lights are useful in
indicating how much power is being sent to the speaker connected. The -9db threshold
relates to approximately 12.5% of the amps available power at the load it is connected
to. The table below gives the ratings at -9db for typical impedances connected.
4
Signal lights starting to blink at -9db
For every increase of 3db that occurs, a doubling of the power is needed, so to that
effect, when the signal lights start to stay permanently on at -6db the power the amp
produces is doubled. Most stage volumes will occur somewhere between the two
Signal lights starting to stay on at -6db
but if you’re happy with the volume levels and the signal lights are not lighting up,
that’s fine!
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