P.Audio SB218 User Manual - page 12
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6. Troubleshooting
The VIA series speakers are high-quality professional sound reinforcement system designed for use
in both indoor, and dry outdoor applications. Some basic precautions will insure long-term reliability.
EQUALIZATION AND GAIN
The VIA series has all the required equalization and gain functions included in the internal digital
signal processing circuits. Both the equalization and gain functions have been optimized for flat
frequency response and maximized system dynamics.
If additional equalization is required, care should be taken to avoid excessive EQ in any frequency
band, but particularly at low frequencies. Excessive equalization can produce “band selective”
clipping and distortion. All EQ boost levels should be monitored if system distortion is present.
PROBLEM: Distorted sound
When input levels to the VIA amplifiers exceed 0.775 V RMS for line level inputs it is possible to
produce system clipping or overdrive. Although the DSP processor has input limiters, it is still
possible to “overdrive” the input section of the enclosure. If distorted sound is present the following
steps should be taken.
Verify that the mixer’s output is not clipping or overloaded. If the output metering section of the
mixing console is continuously in the “red” then the output level should be reduced. (Occasional
“red” indications are usually fine and are dependent on the mixing console’s output capability).
Verify that excessive equalization is not present anywhere in the signal chain.
Verify that AC mains levels are within the required range.
Verify that the correct gain has been chosen on the rear gain control knob on the amplifier.
Voltage measurements on the AC Mains should be performed by a licensed electrician or
individual trained in making high-voltage measurements.
If a harsh digital clipping sound is present, it is a sign that the input level to the DSP is too high. The
gain from the mixer must be reduced.
PROBLEM: No sound
Verify that the amplifier pilot light is on.