Has anyone tried a sealed box bass system ? I tried to connect to a 12" HIFI sub (THX) with an aluminium woofer. never heard such tight bass ! And still, pleasent and soft. almost unreal. Any drawback ? : The cabinet has a SPL at 87 db. at 1 Watt. so it need much power, even at smaller gigs. Could ad more of this , but the cost would be very hi.