Bought this player and the accessories for in-vehicle listening when driving from MD to/from OH in the early '90s.  Unfortunately, vehicles then did not have aux inputs.  I used the (in)famous cassette adaptor to listen to my U2, INXS and other CDs during the 6 hour drive.  The D-555 is/was incredible; the car's speakers and cassette adapter - not so much.  I loved the surround and EQ settings that created a very pleasant listening experience despite the constraints of the balance of the setup.