Mach speaker problem... HELP!

The problem is when the radio is on the speaker makes an annoying einging sound. The sound is low enough to put the radio high and not notice, and also when accelarate the noise also disappears. Its when the radio is on low that you can hear it. the sound is coming from the two lower speakers on the door. Besides that there is no other noise coming from the speakers...

Any help would be appreciated.

check in with the car audio section. it's always some crazy shit like engine vibrations through the speaker wire or even more properties of electricity in action. i don't think that the issue is mach specific or unique to mustangs.

http://www.automotiveforums.com/vbulletin/forumdisplay.php?f=675

ive been doing car audio for years and my good friend is a well known audio specialist if you still need some help you can email me at [email protected] id be glad to help.