I redid the speaker mounts for my 2 rear speakers, and I
think that since then, when you turn the volume down to a low level, or you listen to an AM station, there is an audible
high-pitched "eeeeee" sound that sounds like you're trying to tune a radio station in.

Also, when you turn on the stereo, the speakers have a light "pop" to them.

Any ideas for what could be causing this?
I was thinking it might be a grounding problem, but I'm fairly sure that I didn't have this problem before I redid the rear speakers yesterday.

Any ideas?

Thanks

 

what year runner do you have ?...is the rest of the sound system stock with the exception of the rear speakers ?

 

It's a 96 4Runner,
Alpine head unit (using it for awhile)
All 4 speakers are the same, Polk db5520s

Same speakers as before, ONLY redid the mounting for the rears.

K

 

what your describing sounds like an amp powering on and a little feedback off the alternator due to poor groundage...did you do the install of the head ? does the 96 come with a factory installed amp or anything ?

 

I have the same issue. Mine happened when I added a second battery. I don't think it's anything to worry about though honestly.
Doesn't bother me because when I have the music playing I can't hear it. Check your grounds though I think that's the best bet. Make sure they have good solid connections and can't come into contact with your power cable. Another thing it could be is an RCA problem. Sometimes if you run RCA cables too close to your main power cable the magnetic field will screw with it and distort the sound. Usually that's throughout the volume range and not just when they're really soft. I don't know if you have RCA's to an amp or are running off the head unit though.

Zach

 

FIXED IT!

Took off the door panels, and found that pressure on one speaker caused the problem.

One of the speaker leads was intermittently touching the metal on the door, causing some noise..

Yay!