.....guys, the reason Bose doesn't post specs on the 901's is simple....they would be conceived as bad speakers right off the bat....they are cleaned up by being 89% reflected sound........the system I gave to my son-in-law a year ago was actually homemade....I took quality enclosures about the shape and size of Cornwalls, and loaded the box with Electro-Voice....I used their midrange driver that now runs about $125 on a metal bell up high in the box, and their 15 inch actually guitar woofer that was rated from 60 to 6000....cut at 4500 it gave the most wonderful low mids....here's the likening to Bose....for the tweeter, I had a quality Piezo tweet driver mounted on the end of an EV metal bell....I had it on an L-pad and ran it about 1/4....the metal bell with piezo driver was sitting lone by itself above the cabinet sitting on, truth, an upside-down empty fish food bucket about 18 inches tall....the sideways trumpet end of the bell was pointed more up than forward with the driver end sitting on the bucket....mercy, I had some great high cleanness and presence from that system....to point the tweet directly at you by taking away the old broken vcr tape that was holding it up, brought instant raspy and you wanted to grab your ears....but....reflected off the ceiling, it was Heaven....different dispersion rendering the nectar....that's what 901's do....two eq's in the mix for sure pleased me for a while.....