Having trouble with sound deadening

Audyssey XT32 has a low frequency filter that can be applied to minimize those bass notes that easily disturb people in neighboring rooms.

If you get a AVR or Pre/Pro with the XT32 in it (not the regular Audyssey, it has to be the XT32), it may help the situation.

Been in the insulation business for over 40 years and I completely agree with Avgoround. Good Luck

Auralex subwoofer platform as suggested, or spring isolation are possible solutions to decouple mechanically the sub.

Personally I use springs. (common knowledge to many in Agon now)