Both my pfl9705 and pfl9707 does DD 5.1 passthrough from BD to coax or optical - like many other (ARC?) TVs. This is convenient when using a non-hdmi receiver plus you get perfect audio sync. But both bdp7500 and 7700 "goes stereo" (only, downmixed?). BDP7600 works fine though. Any comments? See thread http://www.supportforum.philips.com/...VD)-models-Why