Specifications

Operator Manual – VCM-88C Controller Page - 11
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Troubleshooting
Situation Action
No Output Check AC power - is blue power LED indicator on? Check input/output connections - are
they reversed? Is the Master Attenuator control turned fully up? Are remote controller
channels switched on? Are the input/output jacks configured correctly (one jack insert versus
two jacks) for the application?
Very Little Output Signal Are the yellow Limiter Threshold indicators on often? Rotate the recessed Threshold controls
clockwise to allow greater output signals to pass unlimited. Check the Master Attenuator
control - normally this control should be fully clockwise at 0dB. Check the RD-8C remote
controller -the fader levels should normally be operated around 8.
Very Little Output Signal Is the peak light flashing? If it is, an overload is occurring within the crossover, and may also
be occurring in other parts of the system. If the peak light is not flashing, the distortion is
occurring somewhere outside the crossover.
Excessive hum or noise Hum and buzz noise is usually caused by a “ground loop” between audio components. Try
using balanced input and output connections between the VCM-88C and other components
in the system. Also, try to power all components in the system from a single AC branch
circuit. Noise can also be caused by a large amount of gain applied to an insufficiently low
input signal. The VCM-88C is not designed to feed microphones directly into the inputs
without a mic preamp first. The VCM-88C is essentially a line level unity-gain device,
meaning it is designed to be fed by a nominal 0dBu line level signal and its output should
typically be 0dBu in level. To ensure proper gain structure in your sound system, press the
remote disable switch in and rotate the Master Attenuator control fully clockwise so that all
VCM-88C channels are at unity gain. Adjust your signal source which precedes the VCM-
88C for nominal 0dBu signal levels, then push the Remote Disable switch out for remote
controllability.
Distorted Sound The maximum input signal level is +23dBu = 10.95Vrms. Above this input level, input
clipping distortion will occur. Also, if the input signal level plus the gain set by the remote
controller goes above +23dBu, output clipping distortion will result.
Note: Unshielded cables, improperly wired connections, and cable with broken strands (shorts,
etc.) are the most common problems. Make sure you use good quality cable with connectors
soldered firmly on the correct pin. When in doubt, get in touch with your Ashly dealer.
Dimensions
Safety Instructions – 3
Introduction - 4
VCM-88C Controller – 5
Connectors & Cables - 5
Physical Description - 6
Installation – 7
A
pplications - 8
Data Connections – 9
Troubleshooting – 11
Dimensions - 11
Specifications - 12
Warranty - 13