i have car mtx audio 3 10" 1200 watt subs hooked up to my home rca dvd/vcr 300 watts but when past volume 35(out of 40) it does a cracking nosie like i just blew the subs but then comes back on and does it nonstop sometimes. i thick it has to do with the watts of the dvd player because it dose it on the other subs also.if i hook up two 4ohm subs with the neg from dvd to neg of the 12" and the pos tho the pos of the 10" and the neg and pos of the 10" and 12" and it wont crack then but i just want the 10 hooked up. that about it