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Go Back   Head-Fi: Covering Headphones, Earphones and Portable Audio > Equipment Forums > Computer Audio

Computer Audio Discussion of computers as source components, sound cards, USB DACs, media servers, etc.

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Old 08-21-2008, 11:22 PM   #11 (permalink)
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I want to thank everyone for their guidance...it really has helped me make up my mind. I am going with the Onkyo 606 (found it at Amazon for $361 with free shipping). I'm thinking this will be the best route.

Thanks again!
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Old 08-22-2008, 10:08 AM   #12 (permalink)
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Originally Posted by gwm1471 View Post
I want to thank everyone for their guidance...it really has helped me make up my mind. I am going with the Onkyo 606 (found it at Amazon for $361 with free shipping). I'm thinking this will be the best route.

Thanks again!
Wow, bargain! If only I lived in the US
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Old 08-22-2008, 05:17 PM   #13 (permalink)
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Regarding digital 5.1:

With regard to movies that have 5.1 audio, this audio is already compressed into a single digital stream. You won't find a DVD or an iso image with 6 discrete audio streams. What you will have is Dolby Digital and Dolby DTS compressed streams.

The ideal is to have a sound card and software that are capable of delivering this stream to your DTS-capable receiver completely unmolested and not processed in any way shape or form.

Your receiver's DSP will do, at worst, just as good of a job as your computer would at decoding it. And this way you free up processing cycles for video processing and only have to use one cable.

As for compressing 6 discrete streams into a single dolby digital transport on the fly, there are a very small number of motherboards and sound cards that are capable of this - and you'd know if you'd bought one because the Dolby license demands a $40 or so price premium on the dolby-encoder version of the board. And this technology is only useful if you are a gamer who wants to use an outboard surround system without six cables - because movie and TV audio are already compressed.
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Old 08-25-2008, 02:06 PM   #14 (permalink)
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Originally Posted by ericj View Post
Regarding digital 5.1: Your receiver's DSP will do, at worst, just as good of a job as your computer would at decoding it. And this way you free up processing cycles for video processing and only have to use one cable.

So are you saying that the "one cable" to the receiver is the HDMI or SPDIF? I thought both processed and decoded audio before sending it out. Also, my understanding is that HDMI is the only way to get TrueHD sound from a PC...everything else (analog or SPDIF) will be Dolby Digital at best. Is my thinking correct?
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Old 08-26-2008, 04:46 PM   #15 (permalink)
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Computers tend to mangle digital audio before pushing it over SPDIF, but they don't have to. On linux, pushing dolby digital through spdif is old hat. It's a trick, but everybody knows how to do it, and the driver features that make it possible are carefully maintained. I've been doing it since 2003.

I have no idea what the situation is on windows. I'd be surprised (but amused) to hear it if it's not possible to stream iec61937 unmolested on windows.

You're only going to find TrueHD audio on HD-DVD and BluRay discs. And yeah, spdif doesn't have the bandwidth for it. Are there even PC systems that support hdmi's audio channels at all yet?
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