If you are worried about bass, get a set of Audiokinesis Swarm subs. The Swarm is 4 to a set; so you can set up something called a 'Distributed Bass Array'. This will prevent standing waves from robbing you of bass (a common complaint, often right at the listening position) and you will have bandwidth to 20Hz.
At that point you'll have your pick of speakers to use for the mains. They won't have to be all that large, since the need only go down to 50Hz or so. To use subs successfully, they must not produce any output above 80Hz, else they will attract attention to themselves. Speakers that image well but don't go below 50Hz or so are common.
At that point you'll have your pick of speakers to use for the mains. They won't have to be all that large, since the need only go down to 50Hz or so. To use subs successfully, they must not produce any output above 80Hz, else they will attract attention to themselves. Speakers that image well but don't go below 50Hz or so are common.