sounds like you might wanna try out a product a heard, er felt, at ces. it's perfectly named "the buttkicker." (i'm not kidding: all their reps had on shirts with their cool logo.) it can be installed in or under chairs or on platforms if you listen & dance simultaneously. it provides the feel of gut whacking bass without disturbing the rest of your family or neighbors. if it's a sub you want, go for a front firing unit, not one that fires downward. there are lots of these available as ht products. should be able to find several used ones here. oh yeah, i highly recommend a powered unit to get the kinda bass you desire. (the hsu will never work for you, IMHO.)