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Old 05-05-2010
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Help Troubleshooting Sub setup

So I just got a sub, box and amp all separate from eBay and wired them up tonight. Sub is a JBL GTO 8" (200W RMS 800W peak), amp is a US Acoustics USB 2080 (280W bridged). When I wired them up everything worked fine and I got all the settings how I wanted them on the HU and amp. I then took all the wires off the amp to mount it where I wanted it and hooked the same wires in the same places. The amp has power and signal from the HU, all the fuses are good and the speaker out wires coming out of the amp are about 0.18V (this seems low to me but I am new to audio equipment. The sub is making no sound now and I can't figure out why. And if it is because the voltage is too low coming out of the amp what can I do about that and what would have caused this?
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Old 05-05-2010
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is ur ground still good? id double check that....

thats what my issues have been with
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Old 05-05-2010
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When I was checking voltage at all the points on the amp I was using the ground on the amp for the ground test point so the ground is still good. If fact, the ground was the one wire that I did not have to take off the amp or the ground location so that one is exactly as it was when everything was working fine.

Last edited by Woods-Rider; 05-05-2010 at 12:46 AM.
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Old 05-05-2010
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Is 0.18V output from the amp for the sub normal? I would think it should be higher, at least 12.
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Old 05-05-2010
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Anyone?
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Old 05-05-2010
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whear are u getting ur voltage from? the speaker outs on ur amp? are u useing a DMM/ what is ur setting on ur DMM?
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Old 05-05-2010
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I got the readings from both the speaker outs on the amp and the speaker wire where it gos into the sub box (both with the same .18v). I am using a dmm. As for settings I don't really know how to describe it other than dc volts. I assume it's set right since I am getting ~12v at the amp power and switch wire from the HU.
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Old 05-05-2010
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Should there be any measureable voltage coming off the RCAs from the HU going to the amp?
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Old 05-05-2010
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without sounding like a dick..but are ur rca's plugged in correctly? i wouldnt worry about ur ground, if your amp is showing that its on...your ground is fine. double check the rca and speaker wire connections. as far as the .18v, i have no clue. post your results..
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Old 05-05-2010
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explain how you have everything hooked IN DETAIL please...
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Old 05-05-2010
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when u set ur gain with a DMM u are to set it on AC volts.

total power X ohms = A
square root of A and that is what u are to set ur amp at.

example: 500rms X 2 ohms = 1000
then the square root of 1000 is ur voltage
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Old 05-05-2010
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chech all your wires from your hu to the amp again check RCA turn on lead Pos NEG everything then if all is good then you know its the amp
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Old 05-05-2010
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Quote:
Originally Posted by bonez View Post
without sounding like a dick..but are ur rca's plugged in correctly? i wouldnt worry about ur ground, if your amp is showing that its on...your ground is fine. double check the rca and speaker wire connections. as far as the .18v, i have no clue. post your results..
The RCAs are in correctly. I have checked and unplugged and replugged them multiple times and have even used a different RCA cable just to make sure the cable isnt the problem.

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Originally Posted by Blknite23 View Post
explain how you have everything hooked IN DETAIL please...
I ran fused power from the battery to the amp. Ran a signal wire from the HU to the amp to turn it on. Both of these are showing ~12v at the amp when stereo is on. I ran RCA cables from the sub out on the back of the HU to the line in on the amp. I ran a ground to the amp. Then I ran the two speaker wires to the sub. I dont know how much detail you want me to go into, but any more than that seems unnecessary to me. If you want something specific I can give you that no problem.

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Originally Posted by OneTireFire View Post
chech all your wires from your hu to the amp again check RCA turn on lead Pos NEG everything then if all is good then you know its the amp
I checked the wires from the HU to the amp at lunch. The signal wire is good, but the RCAs are showing no voltage when music is playing. I dont know how many volts should be there though (didnt check for mV). How do you check if the RCAs are good? That is the only thing it can be in my mind since everything else seems to check out.
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Old 05-05-2010
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OK, so I'm an idiot. The plug with all the RCAs came unplugged from the back of the HU. Plugged it in and everything works fine just like it did before I moved the amp. Thanks for the help anyways guys.
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Old 05-06-2010
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haha, it happens :)
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Old 05-06-2010
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thats why i always do my idiot list before i go rippin stuff up!
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