Have had the EP600 for a couple of weeks now and works great. Having a typical California house, the floor is 12" of pre stressed concrete, and one of my projects has been replacing carpet with a marble flloor. Also have an 8' Cal Spa in the solarium, which is a large part ot the listening area. Last night after finishing up adding the second set of M80's, put some tunes on and relaxed in the spa, with the system runing at about 94db, the EP600 was causing ripples on the water, and the spa has a surround of 12" x 12" granite tile, so its rather solid. Also noticed my two cats were having a reaction to the vibration in the concrete flloor, so ya, the sub does have a lot of power.
