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Ok, I'm working on building a custom CarPC and setup in my car. I've been trying to figure out how to get a high quality DAC setup for my audio. The problem I'm having is trying to figure out how to get 4 channel output as well as a sub channel? The front end software I'll be using doesn't seem to have any settings for select specific output devices or ports for specific speakers? Is there a way I can do this in windows? I'd need to set one channel to SUB for sure otherwise I may not get any audio output on my sub channel at all? Trying to figure out how to do this.
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To clarify, this would have to be through SPDIF I guess? Can the buffalo do 8 channel SPDIF? I was a bit confused by that part of the manual. Can you extract I2s from a sound card or something? Maybe I'm just crazy for even thinking about this.
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No and no, as SPDIF is stereo only. TTL level PCM or DSD are the only methods for multi-channel sound. And yes: one can extract I2S from a soundcard. Some even have their interface on an expansion header.
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Hmm, well then maybe it is possible off the soundcard then.
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Ok, do you know of a thread with an example on getting I2S off a sound card? I need to figure out what the best sound card to get for this and what not. I'm going to look through some of these threads as well.
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LeonvB wrote:http://www.twistedpearaudio.com/forum/default.aspx?g=posts&t=2184
Nice! So the Asus Xonar makes it quite easy for us! That's great news! I have new hope now :)
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Blah! I wish those cards were cheaper..... Is there a cheaper solution that's not crazy difficult? lol
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The ExaU2I would be perfect, but it's 400 bucks.
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See page 4 of the datasheet and then read the guide for the B3, chapter "Connecting sources directly to the DAC board". It's all there.
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Ok I think I figured out WHICH points I'd need to tap, the question I have now though is if just the 4 wires will do all 8 channels? or do I need to get more?
According to the manual "Note: If not using Sidecar but using stereo PCM D2-D5 should be joined via the PCM jumpers.". Does that mean in a multi-channel setup D2-D5 would all have a connection for each speaker?
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You need all 7 wires for 8 channel.
You want multi-channel, not stereo. So that line does not apply to you.
A warning: this will not be a cheap nor a small project. I would suggest reading the BOM at the end of the manual and making a quick shopping list. If you think a Xonar is expensive: it will get worse.
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Oh I know how much the DAC will cost, just didn't want to spend that much just to get I2s out of the pc. I built a dual mono opus previously.
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Do you have to use IVY stages with the B3? I'm not entirely sure what an IVY stage is for but reading over the manual it says for multichannel you need 4 of them? I don't need 8 channels I just need 5 so would I need 4? In fact I'm thinking of making just 4 channels, if I could use 3 outputs on the L/R channels and 2 outputs on the sub channel I think I may go that route and maybe use one of my Opus modules for the rear or something possibly. If it's possible to setup the outputs this way anyways.
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No, you could also use Legato stages. For every 2 channels you need one. For 5 you would need 3 of them (and 6 I2S wires).
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So if I were going to do 3 channels I only need 2 and 4 i2s wires.
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No, you would need 2 I/V stages and 5 wires. For I2S you have GND, DCK and D1 as basic wires, plus 1 data wire for each 2 channels.
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Oh ok that makes sense. I think the rear channels I'd just run off the sound card cause they don't get used much anyways.
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