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I am hearing wierd sounds...from my speakers

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Gunny65

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The audio section is dead so sorry for posting here but, I need some advice.

I have had a intermitant problem lately. Every once in awhile when I turn on the head unit, engine on or off so no it is not alternator type noise, I hear a high pitched squeal from all speakers. The normal music is coming through also but the squeal starts out low and gets higher in pitch but will not go away unless I diconnect the battery ground. Then it will go away, for a short time, and then start back up.

I checked the grounds. I have a ground from the - battery cable to the body, a ground from the engine to the body, and the ground for the amps is connected to bare body metal. I have the amps mounted under the right rear inner removably panel and the body. Just behind the wheel well.

Sometimes the tone is low and you can barely hear it and sometimes it gets down right loud. If I shut the head unit off, it doesnt help....normally. Ideas?
 
Does it only happen in the left or right channel or both? Separate left/right amps or both in the same unit? My initial guess would be that you have a leaking capacitor in your amp.
 
mine did the same thing and it was the grounds. so i grounded the battery to the motor, then on that same bolt grounded the motor to the frame, and off the neg cable up by the terminal grounded it to the body. that way all of the individual truck was grounded to the battery directly. then on the firewall grounded it to the block as well. on my 2 amps i grounded them to the body bolts, and on the underneath of them same bolts i grounded them to the frame as well, no more high pitched whining. other than that if the sound is coming out of all the channels its most likely the headunit. try unhooking the amps and seeing what happens, if it still goes on its the grounds or the headunit itself.
 
After reading the title, I was going to tell you to turn off the rap and turn on the classic rock and the wierd noises will go away. :D
 
Oh man, if I were there........
I think you said that the noise continues sometimes even after you turn the head off. That would seem to indicate that its in the amp.
Its possible for it to still be in the head unit, parts usually stay on with the switch off.

How are the speakers hooked up? Two individual wires from each to the amp, or are you using a common return of some kind?

I know this is going to sound strange, but are any of the speakers real close to the amp or head unit?

This sounds like some kind of feedback. Sometimes electronic components develop a condition where they become what is known as microphonic.
Some things that are not normally affected by sound vibrations start changing gain with sound.
 
Have you checked the remote wire the blue wire if its not connected properly you can get backfeed type souds
 
rampage said:
Does it only happen in the left or right channel or both? Separate left/right amps or both in the same unit? My initial guess would be that you have a leaking capacitor in your amp.
Click to expand...

The squeal is on all 4 Channels. I have one amp on four speakers (front and back) and another amp on the two small subs (behind the seats).
 
Fordum said:
Oh man, if I were there........
I think you said that the noise continues sometimes even after you turn the head off. That would seem to indicate that its in the amp.
Its possible for it to still be in the head unit, parts usually stay on with the switch off.

How are the speakers hooked up? Two individual wires from each to the amp, or are you using a common return of some kind?

I know this is going to sound strange, but are any of the speakers real close to the amp or head unit?

This sounds like some kind of feedback. Sometimes electronic components develop a condition where they become what is known as microphonic.
Some things that are not normally affected by sound vibrations start changing gain with sound.
Click to expand...


The speakers are all hooked to the amp separately...on thier own line. None share....well, except the subs. They are bridged but the sound isn't coming from them.

No, the speakers are all close to the front. Nothing closer than two/three feet.

I also ran the power away from the speaker wires. some come close when they are near the amp but none of the speaker cables snug up against the power cables.
 
When I first connected everything and got the system running it did not make these sounds. It wasn't until after I had it in for about a month. I did some exhaust fixes. One of which consisted of a quick MIG zap. I had to connect the new exhaust pipe to the metal that hangs from the frame. The hanger is connected to the frame via a rubber loop. However, I figured I may as well put this in the discussion as it may have something to do with it anyway.

I also hooked my winch up with a remote.

If I disconnect the ground cable on the battery, the system will not make the sounds for a few days, then a few days to a week later, it starts up again. Sometimes, not often, if I turn the head unit completely off the sounds will not start back up and other times it is quieter but still there. It does it on all sources. Aux, tuner, CD, etc.
 
Gunny65 said:
. . . One of which consisted of a quick MIG zap. I had to connect the new exhaust pipe to the metal that hangs from the frame. The hanger is connected to the frame via a rubber loop.
Click to expand...


:doah: :shame: :shame: :shame:
I'm pretty sure you're suppose to disconnect all sensitive electronic equipment before zapping.

So if you disconnect the signal lines coming out of the head unit do you still hear the noise? That would tell you if it's your head unit or the amps.
 
Yeah, I took the shortcut. I figured since the metal was separated from the frame via a rubber loop it would be fine. I am not convinced that is the problem but...I can't think of anything else right now and I figured if I post it, maybe someone knows how that might of screwed it up in spite of the rubber loop. It didn't happen immediately after the zapping but I figured if I am asking for help, I should put all possibilities out on the table.

I will disconnect signal output lines the next time the squealling starts. One at a time and see if it all stops or if it may be an amp problem. I can also hook the analog lines up off the head unit to check things.

This sucks. My motor blows, I bust the exhaust off, I get tow truck stuck, now my music is squealling. Been a messed up couple of months....truck-wise that is.
 
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