My '04 came with a Panasonic SCHT650 home theater sound system. When it died, I replaced it with the newer Panasonic SCPT660 home theater sound system. The component is not as high or as deep, and connected to the same speakers, making it a rather easy replacement, since it fit in the same cabinet. The DVD isn't blue ray, but it is true surround sound and pretty good sound for a rather inexpensive system. The plasma screen in my coach is not HD anyway, just ED.
'04 Alpine Coach 36' MDDS