Pioneer doesn’t present 1 but rather 4 “Smart Theater” solutions, the 707, 555, 353 and the 303. The first 2 have wireless speakers, the 555 has a DVD player, the 353 is a 555 without wireless speakers and the 303 doesn’t have wireless speakers or a DVD player. All 4 models have MCAC, Multi Channel Acoustic Calibration System, so for all you lazy geeks out there, the systems adjust themselves. They can even improve the sound quality of the MP3, WMA and even AAC files (but if you play a crap song, it’s still crap that sounds great).