The logitech surround sound z906 speakers deliver realistic cinema quality surround sound with the breathtaking power of 500 watts this system turns any movie evening into a hollywood premiere the thx certificate guarantees audio that sounds exactly as it should integrated digital 51 decoding converts dolby digital or dts coded audio into rich surround sound from roaring crowds to footsteps approaching from behind all sounds are reproduced with unbelievable realism you can simultan