2002 tahoe low volume after new headunit

[MANTI5 10+ year member]

Hey, my neighbor is having an issue with his new headunit and the volume of the rear speakers. The wires are all tight and there's sound from the rear but it's really low. It has a factory amp and works just fine when he hooks the factory headunit back up, he has a PAC module someone told him would help but it hasn't. I haven't had much free time to look into for him so I thought I'd pick your brains to see if there's anything obvious.

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[Boomin_tahoe 5,000+ posts]

Check the fader/balance on the HU.

 

[MANTI5 10+ year member]

He did, that's the only way you can hear the rear speakers playing unless your ears are up against them.

 

[Boomin_tahoe 5,000+ posts]

What's the vehicle?

That factory amp, my Tahoe has one also, and had to do a little research as far as locating it, remove the harness then remove the necessary wires needed to hook to the amp. Could be the issue.

 

[MANTI5 10+ year member]

2002 Tahoe