Question about Car Audio & Video

# My 12 inch pioneer sub does not seem to be working, it and my pioneer amp (one channel 1200W) are 3 yers old and I know it is either one or the other. Using a multimeter I have measured the speaker output from the amp to the sub and only get readings of around 10mV. So I know the sub is getting some power to it, though looking online I believe the voltage should in fact be approx double whats going in to it, is that right? Are you able to diagnose the problem with that information? There is nothing wrong with the fuses on the amp etc, and full voltage is getting to the amp aswell. What kind of voltages should be expected coming out of the amp to make the sub work properly?

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• frederator Apr 25, 2010

Cheers, yeah I pretty much figured it was the amp. I used the formula P=VI gathering the voltage and amps from the amp output and dont even getting a power rating of 1 watt, so makes sense that the amp is gone.

Thanks

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I don't have a reference in front of my of what voltage your amp should be pushing, but I can pretty much guarantee its not working if you are measuring a level in millivolts. Thats more like line-level output from your head unit. (measure your head unit as reference.)

The basic math of power is W=EI, that is Watts=Output Voltage X Output Current.

So take the maximum draw of your amps fuses (60A? 80A?) and go E=W/I or E=1200/80=15. Using this example you would expect your amp to be pushing 12-15 Volts, not millivolts.

You could always try hooking a speaker that you know works up to the amp, and an amp that you know works up to the speaker to strengthen the case for the amp being the problem.

I hope that helps.

Posted on Apr 25, 2010

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