my system is directly connected to the batteries and still I get the engine noise in my speaker everytime my engine is on. You think noise filter will help? What's the best and where to get it? Thanks...

what kind of noise? is it a pop, or a whine that differs depending on the RMP?

suggestions for the whine (which is what im assuming you are talking about):

make sure your power and signal cables (RCAs) are seperated. make sure your battery and alternator are working properly. make sure your grounds are secure on every aftermarket audio component. guess thats about it.

:shhh: i do cocaine :/shhh: