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Step 1
Check for a buzz or humming sound coming through the Audiovox system. If your vehicle is running and you notice this hum, try turning off the vehicle but leave the stereo on. If the hum stops, it is likely due to the fact that most Audiovox stereos do not have audio filters inline with the power lead on the wiring. Have a 12v noise filter installed between the power source (the battery) and the power input (at the amplifier) of your audio system to fix this problem.
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Step 2
Check for sound distortion at high volume. Audiovox systems don't always have the best speakers. Many years of the Civic used decent head units but lower quality speakers. As a result, the wattage is too high on your amplifier to drive the speakers. The only real solution to this problem is to have new speakers installed that can handle the power being generated by the head unit's amplifier.
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Step 3
Listen for sound cutting out during normal playback. Sound cutout will happen typically as a result of a bad ground wire. Although the Audiovox doesn't have known ground wire problems, there are not very many good grounding points on some model years of the Honda Civic. Over time, water or moisture gets into the cabin either through a compromised water-tight seal or through humidity, and some of the internal body panels may begin to rust. If this happens around the handful of grounding points in your Civic, have the grounding location professionally cleaned and a new ground wire attached.
