amp whine, can't figure it out help?

[tuff57 10+ year member]

i tried searching, and couldn't find anything

when my head unit is on zero i hear a whine that sounds like it's coming from amp, but i hear it in my engine compartment as well, when car revs it doesn't get louder it stays the same, and when i turn the car off i still hear it for like 3 seconds. when i turn the music up to 15-18 i still hear it but anything over 20 the bass kills the whine sound (probably still going i just can't hear it). it sounds like it's coming from the amp? any ideas? it's an audioque 1200, kenwood excelon x792 hu. all 4 gauge power wire ran, i welded bolts to my trunk to hold my sub box in and that's where i have my amp ground. i haven't done the big three yet(planning on it within next couple of days) i have rockford fosgate rcas, a friend gave them to me don't know how old they are

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[SQAddict 10+ year member]

I am by no means an expert, but it sounds like you might have a ground loop. They make ground loop isolators that might fix your problem. Otherwise, Id check into your wiring (connections, running signal wires (RCA/speaker) on/near your power wires, etc).

My doubts come from it sounding like you have good connections (welds) and the fact that the whine doesnt get worse at higher rpms (accelerating).

Hope that helps, and good luck

 

[mcsoul 10+ year member]

Unplug the rca's from the amp but let it come on with the rest of the radio (remote on) and turn on the car.

Does it still whine?

 

[80INCHES 5,000+ posts]

sounds like a bad ground

80

 

[thevic24 5,000+ posts]

you dont happen to have a pioneer head unit do you?

 

[mcsoul 10+ year member]

sounds like a bad ground
80

Yep, but it could be on the hu, amp or maybe a crappy rca.

May want to do big 1 as well.

 

[tuff57 10+ year member]

it's a kenwood head unit, it's dark out here now so i can't really try it i'll have to try it in the morning, i'm hoping it's the amp ground my radio is a b*tch to get out.

and i'm doing the whole big 3 on sunday leaving the factory wire and adding 1/0 to the battery ground, alt pos to battery pos and then battery to engine. then next week i'll do the chassis to engine ground

 

[x1le 10+ year member]

and i'm doing the whole big 3 on sunday leaving the factory wire and adding 1/0 to the battery ground, alt pos to battery pos and then battery to engine. then next week i'll do the chassis to engine ground

why do the battery to engine? //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

 

[tuff57 10+ year member]

why do the battery to engine? //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

i figured since it's gm terminal and there's only 2 grounds from the negative change them both instead of jerry rigging the factory terminal and the 1/0 gauge wire to the battery. i had extra wire:crap:

 

[mcsoul 10+ year member]

If you run short on time, just do the battery neg to frame, it's the most important, unless your running an HO alternator, then they all are.

 

[tuff57 10+ year member]

i took the rcas off and still whined, i'm going to fool with the ground tomorrow

 

[Savag3 10+ year member]

if you take the RCA's off and it stops then its ? the hU ?

 

[forbidden 10+ year member]

Run the car and turn the stereo off, like dead off, no power, nada. If the noise is still there it is not the stereo. I am going to guess no noise with the car not running either..... that should give you enough info to figure out what it could be......