Sub Dead or Amp Dead?
#1
Member
Posts like a V-Tak
Thread Starter
Join Date: Dec 2002
Posts: 64
Likes: 0
Received 0 Likes
on
0 Posts
![79ford is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
I have a JBL 4 channel amp powering two 5.25" components in the front and one 12" sub (bridged) in the rear. It started the other day while driving, the amp would cut out, i.e. the red light came on on the amp and the green light went out. After a couple of seconds it would come back on, then off, then on, etc. However, as soon as I put the balance all the way to the front, the amp would not cut out, so it makes me think that the front channels are fine? I went out today and started messing around with it, and unhooked the left side inputs (line level) then the sub seemed to work fine for awhile. I began running new wire, then I was about half done and then it cut out again. So then I just started turning the frequencies and levels way down, but now I basically don't hear the sub. Also, somehow I no longer have power to my front left speaker. By moving the balance from left to right, my left speaker works, at left, nothing at center, then left speaker when balance is all the way to the right. What have I done??????? Sorry for the long message.
#3
Member
Posts like a V-Tak
Thread Starter
Join Date: Dec 2002
Posts: 64
Likes: 0
Received 0 Likes
on
0 Posts
![79ford is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
The front speakers are still working off of the front channels (with the exception that the left speaker is always on)
I don't have another amp to test with either. That would be the best way to test the sub I guess. Is there any way to test the power coming out of the amp?
I don't have another amp to test with either. That would be the best way to test the sub I guess. Is there any way to test the power coming out of the amp?
#5
Senior Member
Posts like a Corvette
![Default](https://www.gmforum.com/images/icons/icon1.gif)
its deffinately the amp, speakers dont just quit making noise, they just sound like crap when they completely go, try fooling with it some more u might get it
#8
Senior Member
Certified Car Nut
![Default](https://www.gmforum.com/images/icons/icon1.gif)
What the fronts have problems too? Check all connections. When i say bridge, i mean somethig is crossing the negative and postive wires. My first sub box ever, the wire hookup was bridged somehow, so i had to put a new one in. but if you got subs and a front channel out, your amp may be going. I'd recommend 2 amps to replace it. What are the ratings, and loads you are putting on the amp?
#9
Senior Member
Certified GM nut
Join Date: Apr 2003
Location: Davison,Michigan
Posts: 1,867
Likes: 0
Received 0 Likes
on
0 Posts
![russianpolarbear is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
Originally Posted by BonneMeMN
Something may be bridging the connections, and that sends it into protection mode (I assume that'* what'* happening.