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) ?

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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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3 Answers

Another conundrum


To check for yourself, get an Ohmmeter and see if the outers of the amplifiers RCAs are connected to the ground or each other. If so then it cannot take speaker signals directly.
I suspect the 'High Level' the manual speaks of are the 4volt auxilliary audio signals that can be found on some newer head units, not speaker signals.
Speaker level signals from a bridge amp CAN be used on grounded RCA inputs if the signal is first passed through a simple decoupler and attenuator.
Diagram to explain....
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1 Answer

I installed a 475a to my door speakers and when i turn the power up on the amp my speakers make loud popping noise any idea on wat it could be


You blew the speakers. The speakers were probably not made for that much power and the voice coil blew. If they were stock speakers, then they are defenetly blown. Stock speakers are not made for much power at all, and will more than likely blow with any extra power given to them at all.

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I have 2 6x9 speakers up front 4 6 1/2 3-ways


Hello rjmiller4039,

Although amps with 5 channels are pretty rare, you can get one. Alpine, Boston Acoustics, Infinity, JL audio, MTX, and Polk all have 5-channels ranging in price from around $350 up to around $1,000. The Alpine PDX-5 will output 75X4 watts RMS for the front and rear stereo channels and 300 watts to the mono sub channel. It is priced at $599.99 at Crutchfield.

Hope this helps.


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this will get it out for ya...
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Apr 02, 2009 | Infinity 475A Car Audio Amplifier

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