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Post by me262 on Jul 3, 2016 18:51:32 GMT -5
Hi guys, I'm trying to understand how the digital audio outputs (coax/optical) on the XMC-1 are expected to work in the following scenario:
XMC-1 source: optical in (PCM) at 24/96 XMC-1 Mode: Dirac
What will the digital audio output be? My assumption is Dirac will not be applied to it, is that true? If the source was analog is that still true?
Thanks for the help Sam
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Post by frenchyfranky on Jul 3, 2016 19:17:34 GMT -5
Dirac will never be applied to digital output, also every digital or analog input will be standardized to 2ch 16bit 44khz or 48khz, don't remember exactly.
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Post by frenchyfranky on Jul 3, 2016 19:21:22 GMT -5
Forgot to mention that it also works in standby mode, it's very useful with my small schiit DAC and headphone amp when I'm listening Tv in the middle of the night.
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Post by me262 on Jul 3, 2016 19:57:20 GMT -5
That is exactly what u was hoping to hear, awesome and thank you.
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Post by AudioHTIT on Jul 3, 2016 20:40:01 GMT -5
Dirac will never be applied to digital output, also every digital or analog input will be standardized to 2ch 16bit 44khz or 48khz, don't remember exactly. I thought it was 24/48, but could be 16/48.
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Post by millst on Jul 7, 2016 12:44:00 GMT -5
Last I checked, it won't resample unless necessary. You should get 44.1 for a 44.1 signal. I'd expect 88.2 to be resampled to 44.1, not 48, but I've never verified.
-tm
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Post by AudioHTIT on Jul 7, 2016 17:01:24 GMT -5
Last I checked, it won't resample unless necessary. You should get 44.1 for a 44.1 signal. I'd expect 88.2 to be resampled to 44.1, not 48, but I've never verified. -tm Looks like you're right. I recently hooked up the TOSLink output of my HT XMC-1 to the TOSLink input on my Desktop DC-1, I just ran some tests with various files. The path: Mac mini w/iTunes & BitPerfect > USB > XMC-1 > TOSLink > DC-1 > AM5 It looks like up to 48 kHz it's untouched, above that halved up to 96 kHz - I don't have anything higher. I switched to Apple TV4 and 'pulled' iTunes from the Mac just to see what the XMC-1 does with a 48 Khz file, so that's what the last line's about. This also shows the problem with the XMC-1 reporting everything as 24 bit, the DC-1 doesn't show bit rate.
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Post by AudioHTIT on Jul 8, 2016 11:00:59 GMT -5
I thought I'd add to this that there's a delay in the digital output when compared to the mains. It's not huge but audible, just guessing maybe 100ms?
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Post by millst on Jul 8, 2016 11:17:34 GMT -5
Nice to see additional confirmation. The sample rate on the digital output was broken in earlier versions of the XMC-1 firmware (things were getting upsampled to 192 for me). I did some testing when they fixed it, but nothing that extensive. I use mine for a secondary zone where I'm not going to play hi-res.
I am able to get my second zone synchronized with the XMC-1 mains by adding delay, which would contradict what you are seeing. However, I feel that I've run into your situation before and some combination of adjustments corrected it. There has to be some processing delay added due to the downmix/resample so nothing will be synced if your using an XMC-1 sound mode with no digital processing. Also, the DC-1 might just have a large processing delay.
-tm
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Post by AudioHTIT on Jul 8, 2016 12:10:54 GMT -5
Nice to see additional confirmation. The sample rate on the digital output was broken in earlier versions of the XMC-1 firmware (things were getting upsampled to 192 for me). I did some testing when they fixed it, but nothing that extensive. I use mine for a secondary zone where I'm not going to play hi-res. I am able to get my second zone synchronized with the XMC-1 mains by adding delay, which would contradict what you are seeing. However, I feel that I've run into your situation before and some combination of adjustments corrected it. There has to be some processing delay added due to the downmix/resample so nothing will be synced if your using an XMC-1 sound mode with no digital processing. Also, the DC-1 might just have a large processing delay. -tm A little while ago (for unrelated reasons), I did a rear switch power off of my XMC-1, I now can't detect the delay. It may even be as you say that the digital output precedes the main (I think that's what you said), but it might just be the distance delay or the reverb from the hearing the mains off the ceiling into the loft. In any case the delay seems to have disappeared.
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Post by millst on Jul 8, 2016 16:30:45 GMT -5
Yes, the digital output signal comes before the application of room correction, bass management, etc. are applied.
-tm
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Post by eugene on Sept 12, 2016 17:19:00 GMT -5
Here's an example where having stereo digital output _after_ room correction would be useful: a combined stereo and HT setup where stereo is driven by higher quality DAC compared to Emotiva's. Such DAC could work in pass-through mode in HT application and consume digital out from Emotiva in for listening to stereo music. I have been considering exactly that and would appreciate if there was an option to have digital out with the main channels _after_ room correction.
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Post by millst on Sept 13, 2016 10:43:11 GMT -5
So you're going to limit your audio to 48kHz, possibly downsampling to get there, run it through all kinds of processing from Dirac, and then expect the DAC to make huge improvement?
-tm
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burki
Minor Hero
Posts: 26
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Post by burki on Oct 21, 2016 7:39:35 GMT -5
I'm now setting up my new XMC-1. My problem: I've expected, that the digital outs are working in a similiar way like the UMC-1. With the UMC-1 from all sources (analogues, SPDIF, HDMI,Tuner) the digital "tapeout" gives out a stereo downmix. With my XMC-1 only "SPDIF sources" will downmixed to pcm. Are I'm wrong or is this the wished behaviour for the XMC-1?
Thanks, Burkhardt
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KeithL
Administrator
Posts: 9,901
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Post by KeithL on Oct 21, 2016 8:46:45 GMT -5
The XMC-1 will output mixed-down PCM from all sources - including analog. I'm now setting up my new XMC-1. My problem: I've expected, that the digital outs are working in a similiar way like the UMC-1. With the UMC-1 from all sources (analogues, SPDIF, HDMI,Tuner) the digital "tapeout" gives out a stereo downmix. With my XMC-1 only "SPDIF sources" will downmixed to pcm. Are I'm wrong or is this the wished behaviour for the XMC-1? Thanks, Burkhardt
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burki
Minor Hero
Posts: 26
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Post by burki on Oct 21, 2016 13:05:21 GMT -5
Mmh, my XMC-1 doesn't do it for the two spdif outputs. The analogue tapeout and the two zone2 outputs are working as expected.
Is there any setting for solving this problem?
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burki
Minor Hero
Posts: 26
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Post by burki on Oct 22, 2016 7:52:12 GMT -5
Again: Dosn't has anyone this problem with the firmware 4.0 or can it be a hardware problem (disconnected or broken cable in the XMC-1)?
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Post by AudioHTIT on Oct 22, 2016 12:01:27 GMT -5
Again: Dosn't has anyone this problem with the firmware 4.0 or can it be a hardware problem (disconnected or broken cable in the XMC-1)? Are you not getting any digital signal? What is the specific problem you're having? I have not installed 4.0 yet, but my digital outputs seem to work as expected (as per the chart I posted above).
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burki
Minor Hero
Posts: 26
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Post by burki on Oct 22, 2016 12:23:49 GMT -5
As described above: I'm getting on SPDIF out only a signal from SPDIF and USB ins, but not from analogue or HDMI sources with firmware 4.0. I've not tested older firmwares, because the unit is brand new, but not with the ugrade board.
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burki
Minor Hero
Posts: 26
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Post by burki on Oct 26, 2016 10:49:23 GMT -5
Ok, now I've flashed firmware 4.0 again (my XMC-1 was delivered with it) and now all things are working as expected.
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