Sub problems

[jamesbondmcm]

I took a long trip recently and my subs kept failing at random points. The rest of my speakers were playing fine, but the subs just faded in and out. I took a cursory glance at a rest stop and assumed it was the connection to the battery, which was loose. Today, I tightened it up, but now they're hardly working at all. I can't see anything else wrong with them. I have an embarrassing lack of technical knowledge, so I was wondering if anyone had any advice? Thanks.

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