Question about Dual XAF-460 Car Audio Amplifier

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Car audio amp or speakers bad?

I have Dual brand car audio amp and band-pass box I have had no problems with it in the two years after being installed. A couple weeks ago I got a hold of some extreme bass music and pushed my setup really hard. It was great for a few days, but now all the sudden my amp goes into protect mode if I even turn it up half way. If I crank it the speakers sound good until the amp fades out after a couple seconds. I turn it down and the amp comes back on line. Is there any way I can tell for sure if its the amp or speakers? I have a multimeter. I just don`t want to replace the amp if its going to do the same thing.Thanks if anyone can save the trouble.

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Re: Car audio amp or speakers bad?

If you know how to use a multimeter, you can test the amp this way:

-unhook the subs
-hook up a cheapie speaker you know for sure works to one of the channels
-unhook the audio inputs
-turn the amp on
-set your meter to VDC
-put the positive probe on the inside of the input connector, being sure you make contact with th inner contact
-take the negative probe and tap it on the outside of the connector

What you are doing is sending a low voltage (replicating an audio signal) into the amp audio circuit and allowing the amp to amplify it. If the amp makes the speaker pop each time you strike the probe, the amp is working.

There is an inherent problem with band passes. The naturally filter out high frequencies like a crossover, including distortion, so it makes it hard to hear when the subs begin to protest.

Posted on Nov 22, 2007

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maybe the speaker is bad

First try one thing, switch the rca jacks around and see if the other speaker stops working this time.

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Depends on a couple things.. I'll try to guide you as much as possible and if you have any question just let me know.

If you are running these subs on a ported enclosure or band pass, do you know the tuning frequency of the box? If it is sealed, I would assume it is 35 Hz + -5.

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if you have any question please let me know.

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