Subs Stay On Now?

[JENKS]

Hey guys, I need a little help please. I have a denon 3808CI and definitive technology BP7002's with a C/L/R 2500 center with bp2x surrounds. For those that don't know the BP7002's have built in 12" subs with their own built in 300 watt amps. I have not been running the LFE from the reciever until today. I plugged my y adapter in the sw jack on the back of the receiver and plugged a sub cable into each side then plugged them into the back of the BP7002's. It now sounds as if everything is quiter, and when I turn everything off the BP7002's amps don't turn off anymore. After 30 seconds of the system being off the subs start to make a rumble ever so slightly and I can feel them vibrating with my hand. I tried setting the speakers to both small and large and also set the sub to lfe+main. I am not really concerned about the volume being quieter, but don't want my subs vibrating all day every day. What should I do?