well, im impressed by the sound in my EX7 (love this damn thing btw).
i read all these horrible reviews about the sound, and when i got it i expected the worse. when i fired it up the first thing i did was throw a cd in and turned it up, and let me say , it sounded pretty good. when i use my external speakers it sounds great as well. i think some ppl are just expecting a desktop type sound quality, but i say there is not much difference, maybe i got a good sound card, i dunno. all i know is atm, ive had ZERO problems with the sound. i bought the IOGEAR bluetooth head phones, and they work seemlessly with my system. the sound is great as well.
as far as the cx7 is involved, what do you expect two nickel size speakers to sound like.....lol...go buy some bluetooth head phones.