Question about AudioBahn A8000T Car Audio Amplifier

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Solution my amp A8000T is in protective mode and the fuses are blown but when replace they just blow out again without turning on the radio

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Sounds like you have shorted output transistors or IC'S There is one test is to disconnect all the speakers and see if they still blow. If they do then you need to have the amp fixed or replaced. If they dont blow try connecting up each speaker till the unit blows the fuse asjust maybe you blew out a crossover or a speaker or two?? If you have an active type crossover then I would check that device as well. Good Luck

Posted on Apr 22, 2006


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Amp fuse keeps blowing when car is turned off

It sounds like that fuse is supplying power to more than just the amp and is being shorted out in the START mode. Normally I would think the power to the sound system would be cut off by the ignition switch in the START mode. Try to find out what else that fuse supplies power to. You can disconnect suspected trouble areas to see if that helps locate the source of the fault.

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Where did you buy the radio at? Can you return it to the store? If you purchased it at a big box store, like Walmart, they will take it back without a receipt on an exchange.

More than likely the radio was wired backwards by someone, which blew the protection diode, and then was returned to the store and put back on the shelf.

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I have an a8000t amp with the protection light on, is the amp broke?

Disconnect the speaker wires then the power and ground completly. Then power up the amp and if the protection light turn on the you have an interanl problem if not then you ohm is problably to low and causing the amp to go into protections.


Nov 09, 2010 | AudioBahn A8000T Car Audio Amplifier

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My A8000t amps red protection light is on checked

When ever the amp stays in RED protection mode with out any speakers hooked up to it, YOUR amp has internal damage some where. Can't tell you how much to fix, Could be cheap or not worth it. Talk to your local electronic repair, would be a good start.

May 14, 2010 | AudioBahn A8000T Car Audio Amplifier

1 Answer

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I have an audiobahn A8000t amp with the protection light on

There are many different ways that an amp can fail but the two most common failures are shorted output transistors and blown power supply transistors (< those are not blown). There are several types of protection circuits in amplifiers. The most common are over-current and thermal. The over-current protection is supposed to protect the output transistors. Sometimes it doesn't work well enough to prevent the failure of the output transistors but it will work well enough to shut the supply down before the power supply FETs are destroyed. If the amp remains in protect mode, goes into protect mode or blows the fuse as soon as the remote voltage is applied, shorted output transistors are almost certainly the cause. If the fuse protecting the amp is too large, if the protection circuit doesn't respond quickly enough or if the power supply is poorly designed, the power supply transistors may fail. If you see a lot of black soot on the power supply transistors (near the power transformer), the power supply transistors have failed. Soot on the board doesn't necessarily mean the transistors have failed. Sometimes, technicians don't clean up the mess from a previous failure.
In general, when a transistor fails, it will either short (common for output AND power supply transistors) or open (common for power supply transistors). Transistors act like valves. They control the current flowing through a circuit. A shorted transistor acts like a valve that's stuck open (passing too much current). In the case of an output transistor, the shorted transistors tries to deliver the full rail voltage to the speaker output terminal. If you've ever seen a damaged amp that pushed or pulled the speaker cone to its limits when the amp powered up (common on some Rockford amplifiers), that was almost certainly due to a shorted output transistor. When checking transistors, you most commonly look for shorted connections inside the transistor. You do this by using a multimeter to look for low resistance connections between the transistor's terminals.
I used the terms short and open on the previous paragraph. A short (short circuit) is a path through which current flows that should not be there. An open (open circuit) is a break in the circuit.

Dec 30, 2008 | AudioBahn A8000T Car Audio Amplifier

1 Answer

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If the protect LED is lit, the amp probably has shortedoutput transistors. To eliminate other possible causes, read throughthe following page:

Amp in Protect Mode - Troubleshooting

Let me know if you have any other questions.

Nov 23, 2008 | AudioBahn A8000T Car Audio Amplifier

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Disconnect all speaker wires and signal cables from the amp. If it powers up normally (doesn't go into protection), the wiring needs to be checked. If it still shuts down, the amp likely has blown output transistors.

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Driver ICs or transistors,op-amps that create the idle bias circuit,the protection circuit, the power supply. You should have a schematic of this unit and know how to check the solid state devices for shorts. GOOD lUCK

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