How much of a difference with HD sound codecs? - AVS Forum
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Old 01-10-2013, 04:56 PM - Thread Starter
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My receiver doesn't support 3D video pass-through. So to get HD codecs to work I need either a new receiver or getting a HTPC with 2x HDMI outs.. both expensive options. So the bottom line is, how much of a difference between the sound I can get from SPDIF compared to HDMI HD sounds?
I have an ONKYO 905 if that matters.

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Old 01-10-2013, 06:18 PM
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I think the general consensus is that because BDs use higher bitrate lossy encoding than DVDs typically do, there is essentially no difference between the lossy and lossless versions (in blind testing). As much as I like my blue light to come on for the lossy soundtracks, I think you can rest pretty easy withoug making an investment at this time.
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Old 01-10-2013, 06:31 PM - Thread Starter
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Thanks tongue.gif

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Old 01-10-2013, 09:20 PM
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Quote:
Originally Posted by JHAz View Post

I think the general consensus is that because BDs use higher bitrate lossy encoding than DVDs typically do, there is essentially no difference between the lossy and lossless versions (in blind testing).

Is the higher bitrate lossy sound available from the coax digital output, or just HDMI?

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Old 01-10-2013, 09:56 PM
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Quote:
Originally Posted by noah katz View Post

Is the higher bitrate lossy sound available from the coax digital output, or just HDMI?
I guess you meant lossless hd sound codec. It's only available via hdmi. To get a big difference in sound quality, you would need reference quality speaker with high efficiency sound delivery. You can checkout the speaker forum to get some idea on what other AVS'ers are raving about and better yet listen them in local best buy or the boutique home theater stores.
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Old 01-11-2013, 02:03 AM
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I think he meant lossy from BR via SPDIF.

lossy dts on DVD: 768kbps or rarely, 1.5Mbps
lossy DD on DVD: 192kbps to rarely 448kpbs

lossy dts 'core' on BD: up to 1.5Mbps typically (DVD can do that)
lossy DD in the companion track on BD: up to 640kbps typically but I've seen 448kbps

These can pass via SPDIF. But you are limited to 5.1.

There are other threads already asking about the differences between lossless and lossy scattered around AVS. We just keep repeating the same over and over. The latest (apart from this thread) is this:
http://www.avsforum.com/t/1433605/anyone-hearing-big-differences-between-dts-hd-ma-and-truehd-and-regular-dolby-5-1

Also worth noting: there's nothing "HD" about it in a typical Blu-ray because most BRs use 48kHz sample rate, the same in DVDs, and not usually what people would call high resolution audio (88.2kHz to 192kHz).

My own view is the difference between lossless and lossy is subtle (almost nil with dts) and more in the nuance than night and day differences and very much depends on content (speech/effects/type of music) and volume. Hence it'd be very hard to do proper trials or give generalisations.

Audiosceptics accept audio trials using 25 people. A recent Oxford study with over 353,000 patient records from 639 separate clinical trials shows for every 1,000 people taking diclofenac or ibuprofen there would be 3 additional heart attacks, 4 more cases of heart failure and 1 death every year.

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Old 01-11-2013, 10:50 AM
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Originally Posted by noah katz View Post


Correct, and thanks for the additional info/link.

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