Sound system problem

[silver cobra 10+ year member]

I have a problem that I can't seem to fix. Whenever I manually change tracks on my CD, it auto changes the tracks, or I turn the sound system off, it sends a signal to my speakers to make a single thump. I found out if I turn my bass almost off the sound is very quiet, but I like to keep my bass pretty high and this makes for a very loud and possibly damaging to my speakers thump. I am running a Sony Explode head unit with a Hifonics Titan 1600w amp and two 12" Alpine Type R subs. I had a Hifonics Brutus 1600w amp before and never heard this sound, but because I mounted it on top of my speaker box and the speakers vibrate the whole car so much it fried (twice actually, had it repaired once but replaced it this time.) The new amp is mounted on my floorboard in the back seat. So if anyone knows the reason for this thump any help would be appreciated.

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