So i have my 12 inch JL audio in my truck with a Hifonics 1000 watt amp. Everything was going good, great bass, everything ive always wanted!

Now when i turn everything on all i get from my sub is a crackaly sound. sound is going in and out. really no bass at all. Just a crackling noise going with the music somewhat. This also happens with my 2, 10 inch kenwoods that i tested to see if possibly my JL 12 but blowen. Its not though, because sometimes the system works, other times i just get this darn noise. Sounds like there is a bad connection somewhere or somthing. Ive looked all around and cant seem to find the fix. Any suggestions on what could cause this?

Peace!