Can anyone recommend (make/model/dimension) replacement rear speakers, and perhaps a subwoofer added to my factory '00 Symphony system? What make/model multidisk CD changer is compatible with the Symphony - Clarion or Panasonic?

I have adjusted the front speakers to my liking. I think the system unit is adequate as is, and I don't want to alter the appearance of the dash, or limit system functionaity.

Bringing up this question as I too would love a response to same questions