the ht-ddw660 have excellent sound quality include digital cinema sound , which make it sound like a movie theater . it have Dolby prologic , Dolby prologic II , Dolby Digital , and Digital DTS surround sound . my opinion be that Sony speaker sound better than bo speaker . it have 420 watt total system power . it have two analog input and a optical and coax digital input . this be all you need to transform you tv in to a complete home theater . I guarantee you will love it as much as I do !!!