Got major feedback noise out of speakers especially at low volume. When turned up it drowns out the noise. Got 2-800.4 Kickers with 1200.1 Mono. I've got good grounds, the deck is JBL marine. Does filter really work. The noise is bad?
That is funny you said RCA's, the speakers on the right side under dash stopped working. I pulled RCA's and pluged back in and they started working. The RCA's are split so I think they might be bad. Should I change them all to something high end?