I think so. The 30 doesn't have any internal decoders for new HD audio.
The 50 decodes 7.1 (via HDMI), but only has 5.1 analog RCA outputs.
IMO, they made the new HD audio support way too complicated. DVD was easy. DD & DTS. Either the DVD player did one or the other and had 5.1 analog outs, or just a digital out and your audio receiver did everything. With Blu-Ray there's so many different HD audio types, and so many different ways to output it (analog, raw bits via HDMI, downsampled DTS/DD via optical/coax, decoded LPCM via HDMI, etc...). Way too confusing, IMO.