Question about AudioBahn A8002T Car Audio Amplifier

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Audiobahn a8002t has no sound

Same problem as him. The Amp lights dim to the music base, but the speakers don't make any sound. The power has a 100A as the fuse for the amp, is this correct? Could that be the problem?

Posted by Quinton on

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Marty marty

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If you are getting amp lights to turn on at all, then power is getting to the amp so although the fuse is oversized (50 amp fuse ok), it is not your present problem. I am guessing the final stake transistors have failed. do you know how to test them...you can use a multimeter that has a transistor test function, but first de-solder two of the 3 pins from the pcb...be aware that power MOSFETS may exist that cannot be tested with this meter.

Posted on Aug 10, 2007

  • Marty marty Aug 10, 2007

    by the way, if you do fix this, reduce your fuse size.

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NO sound through the AMP even though the power light comes on


Not a fuse. First thing, to check your speaker (amp unplugged, of course), touch the + and - speaker connections to a 9V battery. If you don't hear a pop sound then your speaker is blown. Thus, no output sound. If speaker is OK, then the output IC is your problem.

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Either the speaker is shorted out (blown), or the output transistors in the amplifier are bad. Try hooking up another speaker to the amp. If it plays, the amp is good. If not, then the amp is bad.

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Sounds problem


First things to check:
  1. You changed the fuses on the amp, but have you checked the fuse that is inline on the +12V wire? Most of the time, it's right near the battery terminal.
  2. Do you have +12V at the amp's power terminals? If not, either your +12V or ground line has a break or disconnect.
  3. Try taking a piece of wire and connecting it to both the remote connection of the amp and the +12V on the amp. This should cause the amp to turn on (if all is well). If not, the issue might be internal to the amp and would require professional repair.

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Amp blowing fuses


The amplifier probably has shorted output transistors.

Disconnect the speakers and RCA cables. Replace the fuses with two 10 amp fuses or a single 20 amp fuse. If the amp blows the fuse when it powers up, the outputs are almost certainly the problem. Don't try it with the two 30 amp fuses. The smaller fuses will provide more protection for the power supply. If the amp powers up with the smaller fuses and they don't blow, check the speakers and the wiring (for shorts to ground or shorts between wires).

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Green LED comes on then fades out


This is common when the output transistors have failed. The amp powers up and the amp senses a problem and goes into protection mode. Generally, there is a protection LED but not all amps have them. To be sure that the problem is not installation related, check the DC voltage across B+ and ground when the amp tries to power up. If the voltage remains above 11 volts, the problem is almost certainly due to a failed component in the amplifier. Disconnect the signal lines and all speakers (disconnect the wires from the amp terminals) and try to power it up. If it powers up, you could have a defective speaker or defective wiring. If the amp still fails to power up, the amp should be checked by a qualified tech.

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