Really I guess it's the player AND the receiver. The player needs to be able to pull the data off the disk and get it out to the coax or optical port without mucking it up, and then the receiver needs to be able to decode it into all the right channels.

That's the nice thing about speakers. Their job never changes and they don't care about formats. They also don't care about whether the source is digital or analog, despite the "digital-ready" plaques on many inexpensive speakers

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8