Stereo shuts off at high volume

[Bigbee246]

Ever since I got my Sony headunit which has a built in 45w amp I have been having problems with it shutting off when I crank up the volume to around 45-50 (50 is the max volume) and the bass hits. I have replaced my battery, alternator, checked my ground, and it still does it. I did however find out that if I disconnect one of my rear speakers it does not do it. It doesn’t matter if i disconnect the rear left or rear right, but it does seem to solve the problem. I’m thinking that having all 4 connected just draws too much power out of the amp and it shuts off because it doesn’t have enough power. I am going to do the “big three” grounding mod soon to see if that helps any. Also my dome light dims really bad when the bass hits, even after replacing the alternator and battery and I even cleaned up the terminals and ground. Any help would be greatly appreciated!!!

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[keep_hope_alive Premium Member]

head units aren't made to function at full volume (they also sound pretty awful when doing so). 

do you have external amplifiers?  you shouldn't have dimming issues from just a head unit.

You could run a dedicated wire from the battery to the radio to remove the radio from the dash wiring (which may be why you're shutting off).  I've attached a diagram of how to do that with a relay.  I run my head units this way to keep them isolated from the car wiring. 

 

[keep_hope_alive Premium Member]

Also, it's possible you have a slight short in the wiring, just one wire strand close to metal could arc and short. ensure your connections are well insulated.

 

[Bigbee246]

Sorry for the duplicate post. I still would like to have the ability to at least get near full volume with all 4 speakers connected. No, just the built in 45w amp in the headunit. I checked all my connections but don’t feel like ripping out every single wire going to the speakers.