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Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter
No Audio Output
Check AC power - is the pilot light on? Check in/out connections - are they
reversed? Are you sure you have an input signal?
EQ Controls Do Nothing
Is the master EQ switch in? The lowest and highest frequency sliders may be
beyond the range of the program material or speakers and may produce little or no
audible effect.
Peak Light Flashes or Stays On All the Time
If the peak light flashes, the signal level to the equalizer is too high. Turn down the
gain. If it is on all the time, disconnect the input and output cables. If it is still on, the unit
must be returned for service.
Distorted Sound
This will only be caused by too much signal which will show on the Clip LED. If the
LED is not flashing, there is an overload some-where else in the signal path. Adjust the
relative gain of each component in your chain to keep everything at a comfortable level.
Excessive Hum or Noise
Hum will usually be caused by a ground loop between components. Try using the
suggested balanced input and output hook-ups if the other pieces of equipment used in
conjunction with your equalizer have balanced inputs and outputs. Noise (excessive hiss)
can be caused by insufficient drive signal. Make sure you are sending a nominal 0 dBu line
level signal to the equalizer. Most noise problems occur because gain is applied to audio
signals too late in the chain. For best performance, apply gain to individual source signals
as early as possible, like at the mixer input preamp section. As gain increases, it also boosts
the noise content of that signal. Any cumulative noise built up in a mixed signal will only
be increased by using an equalizer as a gain device, so make every attempt to operate the
equalizer with as little gain as possible. Note: Unshielded cables, improperly wired
connectors, and cables with broken strands of wire are very common problems. Use
quality cables with quality, correctly wired connectors.
11. Equalizer Troubleshooting Tips
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