I recently upgraded to a Pioner DEH-P3500 head unit with Pioneer 6880R speakers in the doors and Pioneer 6870R's on the rear deck. I'm noticing a hum/buzz from the rear speakers at certain low frequencies. I'm pretty sure I did not blow them. I'm suspecting it's the metal speaker housing making contact with the metal mounting tray in the rear deck. The factory speakers had a rubber cushioning strip on the back of the speaker housing to insulate it from the metal of the mounting tray, the 6870s do not.
Is there narrow rubber stripping I can get for this? Preferably adhesive on one side? Back in Europe I used to use a special silicone. You'd squeeze it on the mounting tray and let it cure. It would adhere to teh tray and form a soft cushioning bead on which you could mount the speaker. Sort of like a 'gasket out of a tube' :-) However, since it cured, it would not adhere to the speaker so removing the speaker was easy. Is there such a thing available? or another way of insulating the speaker from the mounting tray?
Thanks in advance!