This SD-550 is like the grandfather of surround sound or even SACD’s multi-channel playback. With the SD-550, you could enjoy some good old fashion 4-channel “surround” sound to your music by having it “de-matrixing” the signal. With some careful adjustment in time delay and reverberation, you could almost mimic listening to your favorite music in a hall like atmosphere.
Cosmetically, there are some minor scuff marks from use but nothing major. Unit will be securely packed for sage shipping.