Table of Contents
Advertisement
Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter
10. BLOCK DIAGRAM
2
3
1
EQ
INPUT
-
-
HPF
+ +
HPF In/Out
CHAIN
2
3
1
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.
14
6dB/15dB
GAIN
15 BAND EQ
EQ In/Out
EQ OUTPUT
INPUT/OUTPUT METERS
VCA
OUTPUT
LEVEL
CHANNEL
DETECTOR
IN/OUT
CIRCUIT
TH
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
2
3
1
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
2
3
1
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
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.
Advertisement
Table of Contents
