I just bought a boat with the sub, amps, tower speakers and all that stuff. I am wondering if anyone knows why the sub makes a continuous "thump" noise when nothing is playing in any of the settings (XM, disc changer, am/fm) I have a sub volume knob and it decreases with that, of course, but I can faintly hear the sound when a song is playing. When the stereo is on, the only non-related equipment running is the depth finder. The amps are about two feet from the sub. Kicker 12" w/ an SX6503 and a KX8504 running the tower and interior. Sounds great otherwise! Any suggestions? Buehler?
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