buzzing/squealing noise issues

[SharkOnLand 10+ year member]

Hey guys, Ive been having an issue with my system lately. BTW my car is an 07 335i coupe.

So about 2 months ago a got a complete system installed in my car(2amps and upgraded speakers + subs added) and everything was fine. First I constantly hear a light hissing noise from speakers ALL THE TIME. Regardless if something is playing or not. When I play something it gets pretty unnoticeable and anything playing at a decent volume, you cant hear the hissing.

The second thing is sometimes I would hear a squealing noise from the speakers. Once it comes on, it changes according to the revs of the engine. I disregarded it since it came on a handful of times since the install. Just 2 weeks ago I got another amp installed in my car for my rear speakers and I noticed the noise came on everytime when I put the AC on and was louder than before. Especially, the warmer the engine got(continuous or long drives) the noise was loud. The squealing noise is coming from my REAR, im guessing the amps or battery.

My amp for the subs is RF 1500 watts, front ARC audio 400 watts and rear 400 watts..thats a total of 2300 watts and another 440 watts for the oem amp which totals to about 2700 watts, and I have the stock battery with nothing added for power. I was thinking the squealing was from the batter due to the extra stress??? Can you guys help me out??? thanks

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[Mike465 10+ year member]

Was the stock amp bypassed?

 

[SharkOnLand 10+ year member]

Was the stock amp bypassed?

i believe so but I am not 100% sure since I didnt do the install myself, I had it done at an audio shop...Do you think that maybe the cause for the noise??