low pitch hum

[steelblue75]

Hi every one, its been a while since i posted. installed a custom autosound
U S A 6 stereo in my 75 & now i "m getting a a low pitch hum thru the speakers.
has any one had a similar problem? Mid America sells a noise filter. anyone
use one? Thanks for listening.
George

 

[lucky76]

It's common to have to put a filter on the 12 volt supply to auto radios. Noise is usually caused by your distributer or spark plug wires. You don't have to buy it at Mid America, most Auto Stores or electronic stores sell them. Lucky