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Question about Infinity 475A Car Audio Amplifier

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Component speaker not working

I purchased one 6 mos. ago a alpine head with ipod cap. the power system includes a infinity 475a power amp, rockford/fos. sub amp 500a? rock/fos. 1far. capaitor and all rockford/fos. rca & power supply cable. The front speakers are infinity components, the rear are infinity 5x7 coax infinity's and two 10' dual coil infinity sub speakers. The problem is the drivers side component lost power. However, the tweeter on this particular speaker worked for a while but recently went silent. connections (appear) adequate at component and cables fully inserted at amp. Can I test for voltage at speaker terminal to exclude possible amp problems? does this occur freQently due to accessive Drivers door abuse? (cute description) ?

Posted by waahip on


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Tygh Duval

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The easiest thing to test is to try swapping the connections of the front component speakers at the amp connections. If the problem follows the speakers, the issue is probably with the speakers. I would triple check (again) the speaker wire connections. It's also possible the crossover for the driver side component speakers has an issue (thus why the tweeter worked for a while).

If the problem stays on the drivers side, the issue is probably with that channel on the amp. Triple check the RCA connections for that channel.

It's much easier to test other speakers on an amp channel versus trying to check it with a meter.

If the driver's door is "abused" often, my initial thought is the wiring at the speaker or the wiring in the speaker (to voice coil, within the crossover, etc) is the most likely culprit.

Posted on Apr 10, 2008


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