I've got 2 diamond m6's running off a genesis miniblock amp each n 1 of the subs vibrates back n forth even when i'm not playing anything through them when i switch the system off it seems to pop?? anyone got any ideas?????

Noise in the system?

Knackered amp?

Regarding the turn-off pop, have u got any other processors in the system?

i'm running an alpine flip monitor into audio control 4.1 eq which feeds to the amps the sub is ok on the other amp. if it is the amp which i presume it is whats best to do??

Ground loop problem , just a thought!!!

Have a look at grounding as suggested above. It's definitely something happening in the amp or its power (+ ground) if you've tried swapping things around and the trouble disappears.

I guess you got this from LCA? Have you tried taking it back suggesting it's faulty or having them have a quick look over? I know one member has had a few "issues" with them and warranty, but this sounds a straightforward case.