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Comments about Yamaha YSP-4100 Digital Sound Projector:
Recently installed this in the living room of a mid-sized condo unit. The room is not exactly square with a large open kitchen off of one side.
After automatic calibration, I instantly experienced great surround effects while playing the included DEMO CD.
Level of surround effect depends a lot on the source of audio, however overall I'm very happy and impressed with the technology.