Perry Babin posted an answer for this Dual Electronics illumiNITE XIA3145 Car Audio Amplifier:
"Generally, this indicates that there's at least one shorted output transistor. Disconnect..."
Perry Babin posted an answer for this Power Acoustik GOTHIC OV2-1200 Car Audio Amplifier:
"It probably has shorted output transistors. Most of the time, all you need to do is..."