Just close couple four of those and it should be good enough for your home theater
" I am using 4 4645B's (which i think are very similar to the SIS's but I have no experience them, i just know you mentioned them in a post of mine when we were discussing the 4654 line of subs.) powered by 4 Crown's (bridged) in a 20' x 40 x 10 room (8000 cu. ft.) and believe me they are "earthshattering" ... "
I second this, with a suggestion;
Get a digital xover with the ability to create a " Stepdown mode " also known as a B6 filter.
Then get a LARGE amp ( Crest 7200 or QSC MX3000a ) and there's your insane bass.
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