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Car Audio Do you live in your car? Then you need to be able to listen to some high-quality music.
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Old 05-12-2007, 12:32 PM
Tonglebeak Tonglebeak is offline
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amps not drawing power?

I have dual profile amps, and I have no idea why they're not putting out.

I have 10.7v on the remote wire going back, 12.1 volts on the power. Grounds are fine. I'm getting .02v off of my rca cables, and .6 volts between the speaker terminals on the amps. So I know power is getting back there, and the amps are seeing it. All voltages were probed @the terminals on the amps.

Why would they not push anything through the subs? I can say these two things:

1) I had to splice my rca cable together for the right speaker (the left speaker's rca was fine).

2)Whenever I take off and put the rca cable back on, as the cable is going back into the hole, the subs do move, but once the cable is fully seated, nothing. This occurs on both sides.

EDIT: I measured the rca jacks off the headunit to ground, no cables involved. I got only .06 volts. Bad headunit?
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Old 05-13-2007, 11:22 AM
PaulD PaulD is offline
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Re: amps not drawing power?

10.7 V on the remote wire may not be enough to turn the amp on

if you wanna measure RCA voltage, you need to put the multimeter to measure AV volts, not DC
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Old 05-13-2007, 11:42 AM
Tonglebeak Tonglebeak is offline
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Re: amps not drawing power?

The amps do light up.

And I should be using AC? That explains a lot! You might've just saved me $130.

Also, my cousin thinks my rca cable is shorted out somewhere. We'll see...
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Old 05-13-2007, 05:48 PM
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Re: amps not drawing power?

yea, the signal from your cd player will be somewhat of an AC signal, definitely not DC. Oh, and if you have say 4 volt outputs .... you will NOT read 4 VAC on the RCA outputs.
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Old 05-13-2007, 07:12 PM
Tonglebeak Tonglebeak is offline
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Re: amps not drawing power?

I'm actually reading nothing as far as AC goes. I get readings with DC though. Maybe I'm hitting a bad ground when I go from jack to ground, I dunno
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Old 05-13-2007, 07:39 PM
Tonglebeak Tonglebeak is offline
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Re: amps not drawing power?

Yup, I verified my ground. It's fine. I'm still getting shit voltages off the rca jacks, but I am getting milliamp readings now (I'm using a different multimeter that's suffered less abuse). At around a pleasant volume, I read a fluctuating amperage of around 6mA, and it increased as the volume increased. I went back to the amp and measured the rca cord on the other end. Same reading, so the current is getting back to the amp.

Again, when I have the rca cord partially on the input jack on the amps, the subs move (I would assume from noise). However, after the cord is fully seated, nothing.

Any other ideas? I'm beginning to think there's gremlins or something and that it's not the headunit.
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Old 05-13-2007, 08:11 PM
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Re: amps not drawing power?

sounds like your preamp outlets might be shot.
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Old 05-13-2007, 09:48 PM
Tonglebeak Tonglebeak is offline
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Re: amps not drawing power?

Are you referring to the h/u? There is current coming out of the jacks and back to the amps.
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Old 05-14-2007, 06:15 AM
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Re: amps not drawing power?

you said you werent geting a voltage reading
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Old 05-14-2007, 07:10 AM
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Re: amps not drawing power?

Right, I'm not getting a decent voltage reading. Even with a new h/u. But I am getting current.
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Old 05-14-2007, 01:59 PM
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Re: amps not drawing power?

when you say you had to splice the leftt to the right rca did you use a y cable. also i will would have to check but wouldn't if the left and right rca both have the same signal cause it not play since it no is longer a/c just d/c.
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Old 05-14-2007, 05:39 PM
Tonglebeak Tonglebeak is offline
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Re: amps not drawing power?

No, I simply spliced the right rca cable together. The left side was untouched. The right side was broken apart so I just did a butt-connect. In any event, I'm still getting nothing from the left rca cable, but there is current and everything is fine as far as wiring is concerned.
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Old 05-15-2007, 06:49 PM
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Re: amps not drawing power?

I guess I have never taken voltage readins from my RCAs .... you do know you have to put a 1-10K Ohm resistor from shield to tip, otherwise no voltage with flow.
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Old 05-15-2007, 07:30 PM
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Re: amps not drawing power?

actully when i did mine it said .04 volt and was constant. so i firgured it meant 4 volts cause that is what my hu is rated for,
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Old 05-15-2007, 07:49 PM
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Re: amps not drawing power?

Quote:
Originally Posted by PaulD
I guess I have never taken voltage readins from my RCAs .... you do know you have to put a 1-10K Ohm resistor from shield to tip, otherwise no voltage with flow.
Actually, no, I didn't.

I guess I'll eliminate the h/u as the culprit. Err, it's looking more and more like I blew both of my amps, at the same time

I'll have to pull the subs out tomorrow to verify they're still connected inside the terminals.
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