
Originally Posted by
MrBoylan
Well Geoff said he could hear differences between the highest bandwidth lossy codecs (e.g., DTS @ 1.5 MBPS, Dolby Digital @ 640 KBPS) and lossless codecs (DTS-HD MA and Dolby TrueHD), but these differences were fairly subtle. But this isn't the full story when considering upgrading an older receiver to one that supports HDMI audio decoding. More on that below.
What preamp/processor do you have? My friend is a little stuck as he has a super high-end Bryston pre/pro that only supports the lossy formats (no HDMI decoding). It's got a great analog stage and nice sounding DACs, but "upgrading" it to support HDMI audio decoding basically just means trading his in toward a newer model and that privilege will set him back several thousand $$$. So for him, he's going with the OPPO BDP-83 because it supports SACD, DVD-A, on-board DTS-HD and Dolby TrueHD decoding, has pretty decent bass management and speaker calibration options and allows you to boost subwoofer levels in the player (unlike most of the competition). So it will work well with his current preamp processor using the external line inputs of the pre/pro.
What kept the smaller high-end companies from getting into HDMI audio decoding wasn't so much the format war (both HD DVD and Blu-ray used the same Dolby TrueHD and DTS-HD codecs) but the cost of admission during the early days of HDMI audio processing. When you're Sony or Onkyo or Panasonic, you can afford to buy a few tens of thousands of decoder chips in order to get the volume discounts. For the smaller esoteric high-end companies to get into HDMI decoding and switching would have been a much more expensive proposition because it would have cost them much more per unit. Also, with the first several batches in high demand, the larger volume vendors got priority of supply.
Now DTS-HD and Dolby TrueHD decoder chips are coming down in price and up in quantity so smaller companies have fewer barriers to getting into that market.
But as for lossless vs. lossy, yes they can both sound excellent, but what people forget is that with Blu-ray you've now got this whole new animal - multi-channel uncompressed PCM - which cannot be passed over fiber or coax connections so it gets down-mixed to 2-channel output. Oh it may have some pseudo surround rear-channel info mixed in there so you can extract that with Dolby Pro Logic. But this is not discrete surround and that *IS* immediately obviously different from discrete multi-channel surround.
In your case, you're even worse off because your processor doesn't support DTS either, so you have to output multi-channel PCM, DTS, DTS-HD MA and DTS-HD HR all as down-mixed two-channel PCM and rely on your processor to derive some matrixed mono rear channel information out of that two-channel signal. Also, all 7.1-channel soundtracks on Blu-ray get down-mixed to 5.1 when output over S/PDIF digital.
Does your preamp/processor have multi-channel analog inputs? If so, why not experiment with that so you can get real multi-channel surround out of Blu-ray Discs with multi-channel PCM soundtracks and from DVDs and Blu-rays that use DTS or DTS-HD? Yes, it's trickier than connecting via S/PDIF digital but the results can definitely be worthwhile.
Later,
-Chris