They sound like the old Solos and Reference line on the top end, but they don't have bottom end. You will definitly need a sub. They need break-in time, so make sure when you audition them they are not right out of the box. Use equipment that is smooth/warm and not bright or etched. The Gallo tweeter will tell all. You don't need power. These things are 93db efficient! They should work better near walls than the older models, because the tweeter only radiates 150 degrees. The original models need to be well out in the room for the 320 degree tweeter to work best. If you have the space, I would go for used Solo or Reference speakers across the front and opt for Due surround arrays. If you have a small room and/or space limitations then go all Due.