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Old 06-10-2012, 02:14 PM #1
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External amp installed to front speakers, now back speakers don't work
I purchased a new head unit, front speakers, and an amp. I installed the head unit and the new speakers in the front of the car first, and all the speakers were working, then I installed the amp a week later to power only the new front two speakers, and now only the front speakers work, nothing else. I think the problem is the internal amp which powers the back speakers is shutting off, since I am using a new amp but I am unsure how to fix this if that is the problem. Any feedback would be appreciated. thanks
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Old 06-12-2012, 10:49 PM #2
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the Head Unit should switch the internal amp on and off when ever you tell it not automatically, check your connections behind the head unit. it will be a separate plug.

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Old 06-13-2012, 05:48 PM #3
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Did you by chance splice into the front speaker wires without disconnecting the internal amp of the head unit?
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Old 07-08-2012, 08:07 PM #4
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Question
Ok. Instead of talking in general here, give us specifics. Do you have the factory speakers installed in back? Are you going from OEM JBL to aftermarket? Etc, etc.
What is the brand / model number of the aftermarket radio you installed?
What is the brand /model number of the amp you are installing?
Speakers?
Did you use a wiring adapter when you connected the deck to the OEM wiring?

There's no real turning off of the internal amp guys. If you don't have anything connected to the high-out (speakers), it doesn't see a load. It's not suggested to have speakers connected AND RCAs as this can cause the ICs to burn out, But in all my years installing it's always been just one or the other (connect speakers OR amp RCAs). No switching of internal amps on & off. Not to say there may be a few out there like that, however, MOST you don't need to do anything other than connect it correctly. Now, I'm not saying I am absolutely right, and you are wrong. I do remember an Alpine I had many years ago that you had to switch the EQ setting from deck to AI-Net if adding an external unit. Anything is possible. Which is why I'm asking for model numbers etc.

Anyway, how are you inputting the front audio signal to the amp? Are you using the high out input or low out (speaker level, or RCA)? If it was high out you would have used the white & white/black and grey & grey/black wires from the deck to the amp. If you used RCAs, you should now cap these wires out of the deck with heat shrink or tape because they won’t be used.

The green & green/black and purple & purple/black wires should be wired directly from your deck to the rear speakers. If there was a JBL amp in the system, bypass it by running your own wires to the rear speakers from the deck.
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Last edited by A/V1; 07-08-2012 at 08:10 PM.
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