Ashly DPX-100 Manual de instruções - Página 14

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Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter

10. BLOCK DIAGRAM

INPUT

HPF

+ +

HPF In/Out

CHAIN

LIMITER

INPUT

GAIN

+ +

GAIN REDUCTION DISPLAY

RATIO

ATTACK

RELEASE

11. Equalizer Troubleshooting Tips

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.

6dB/15dB

GAIN

15 BAND EQ

EQ In/Out

EQ OUTPUT

INPUT/OUTPUT METERS

VCA

OUTPUT

LEVEL

CHANNEL

DETECTOR

IN/OUT

CIRCUIT

THRESHOLD

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 rela-

SIG

tive gain of each component in your chain to

keep everything at a comfortable level.

CLIP

Excessive Hum or Noise

Hum will usually be caused by a ground

loop between components. Try using the sug-

gested 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

CLIP

insufficient drive signal. Make sure you are send-

ing 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 in-

dividual source signals as early as possible, like

LIMITER

at the mixer input preamp section. As gain in-

creases, it also boosts the noise content of that

signal. Any cumulative noise built up in a mixed

DETECTOR

signal will only be increased by using an equal-

INSERT

izer as a gain device, so make every attempt to

operate the equalizer with as little gain as pos-

sible.

Note: Unshielded cables, improperly wired con-

nectors, and cables with broken strands of wire are very

common problems. Use quality cables with quality, cor-

rectly wired connectors.

11.1 Compressor/Limiter Troubleshooting Tips

No Output

Check AC power. Is the power switch on? Check

input and output connections - are they reversed? Are

you sure you have an input signal?

Controls Have No Effect

Is the limiter in/out switch in? Perhaps the ratio

control is set too low to produce an audible effect or the

input level is below threshold. Is the threshold LED light-

ing up? If not, lower the threshold setting or increase the

gain. Do not expect to hear any effect when the input

level is below threshold, since the unit is simply a linear

amplifier at those levels.