Setup: I have an alpine 9853 HU, 2 alpine 12" type-s 2-ohm dvc subs, and an alpine mrd-m605 amp.
Problem: I noticed that when that when I put a cd in my HU I hear a muffled or rumbling bass coming from my subs, It also does it when I skip tracks on my cd. And when I turn the subs off from the HU the subs continue to play at a really low volume.