amp works with 1 sub and not 2

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=112739
Printed Date: May 14, 2025 at 2:56 PM

Topic: amp works with 1 sub and not 2

Posted By: stylinz
Subject: amp works with 1 sub and not 2
Date Posted: March 27, 2009 at 11:05 PM

So here's my setup:

Audiobahn a8002T

200.0 Watt - 4.0 Ohm - 2.0 channel(s)
400.0 Watt - 2.0 Ohm - 2.0 channel(s)
800.0 Watt - 4.0 Ohm - 1.0 channel(s)

2 10" JL 10w-1

4 ohm single voice coil
125watt RMS

Ported box

Now that all of that is out of the way. Here's way happens.

hook each sub to each channel and the power light will continually fade out (along with sound) After a few times of this it'll eventually cut off and then turn back on and the sub will shoot out and then th protection light will come on.

hook 1 or 2 bridged............ same thing..

hook 1 to 1 channel and it works perfectly.

Any suggestions?

TIA

Replies:

Posted By: Chad7n7
Date Posted: March 28, 2009 at 6:31 AM

Sounds like possibly bad ground to amplifier, or not enough power to supply amp for current draw. Check to make sure your amp is properly grounded, then use a DMM to check voltage at amp when it "fades out".

Posted By: i am an idiot
Date Posted: March 28, 2009 at 6:39 AM

You said hook one to one channel and it works. Did you mean to say hook one to either channel and it works?

Have you checked voltage getting to the amp while it is trying to play?

Posted By: lil evo
Date Posted: March 28, 2009 at 11:00 AM

what guage wire are you using?

Posted By: stylinz
Date Posted: March 28, 2009 at 11:28 AM

Ill check the voltage and see. Yes one amp to either channel works fine. Ground seems good. Bolted to the rear shock tower stud. It's 4 gauge wire.

I'll add this it did the same in my other car with a 2 gauge wire a good ground and 2 audiobahn sub which are 6ohm DVC speakers except it''d push two just had to have it turned down a bit.

Posted By: dustin42069
Date Posted: March 29, 2009 at 11:05 PM

did you try it 1 sub to 1 channel and the 2nd sub on the second channel that should give you the right ohms

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Dustin

Posted By: mtparker18
Date Posted: March 30, 2009 at 10:02 AM

try them in series-parallel