Jump to content
Sign in to follow this  
ted_b

First multi-channel DSD playback solution with Mytek!

Rate this topic

Recommended Posts

It was super cool watching the leds of each Mytek DAC light up on the stack of 3 Myteks while playing multichannel.

The surround sound even in the smallish room they had to audition in was spectacular. Remarkably the best surround I have ever heard. I supplied them 2 Double DSD music files and the 3 units all displayed HDSD as they played the files.

One thing I wish I had spent more time checking was the neat way Chebon manipulated the files in JRiver.

And we found out, you did try it Ted_b didn't you ? That JRiver and Mytek will play the ISO DSD files without extracting the individual files.

Share this post


Link to post
Share on other sites

Direct ISO playback of multichannel content, DST-compressed or not, is quite doable in JRiver/Mytek. Jriver calls them file type "SACD" so browsing or creating views with ISOs is easy. However, it has huge cpu load issues (especially those with DST compression content, which are not easy to identify without first extracting some test files on the ISO) that I'm trying to get my arms around.

 

I built a minimalist server (CAPSV2+) for good reason; keep it simple, keep it clean, keep it doing just 2 channel music serving. The idea of having this server now do decompression of DST, "unwrapping " of ISOs, etc is not something I am quite sure I want to do. That's my theoretical first impression. My real world first impression is that my CAPS doesn't have enough cpu horsepower to do it, and it freezes and coughs and wheezes. However, my CAPS V2+ was never intended to do multichannel in its design, so its place here is just for this prototype (and yet serving multichannel DSF has been flawlessly accomplished to-date).

 

So, my first impression is this: direct multichannel ISO playback is cpu intensive and will require a bigger machine like a CAPS Zuma or non-CAPS design. I have yet to determine if it even sounds as good as extracted DSF files, and its clear that the metadata is not as good out of the box (and likely player specific). But it would certainly save time and storage.

Share this post


Link to post
Share on other sites

I've ripped some SACD from RCA(three channel SACD) and Pentatone RQR(four channel SACD). But when I drag the ISO file into JRiver, it showed those tracts are "5" channels. Does anyone encounter this situation? I only got two myteks now, which should be able to play 4 channel DSD.

Share this post


Link to post
Share on other sites

John,

As I said in my several PMs to you, JRiver sees them as 5.1 files even though only 3 (or 4) channels are actually used and active. I am working through the issue of having only 2 DACs, as I said. Give me some time. This is all experimental. Right now i know 3 DACS works; not exactly sure why 2 don't..my first theory is that JRiver wants to downmix to 4 channels, and downmixing is a DSP (i.e PCM) activity. Just a first hunch.

Share this post


Link to post
Share on other sites
John,

As I said in my several PMs to you, JRiver sees them as 5.1 files even though only 3 (or 4) channels are actually used and active. I am working through the issue of having only 2 DACs, as I said. Give me some time. This is all experimental. Right now i know 3 DACS works; not exactly sure why 2 don't..my first theory is that JRiver wants to downmix to 4 channels, and downmixing is a DSP (i.e PCM) activity. Just a first hunch.

 

Ted,

 

Thanks for your reply. I think I must have missed what you've mentioned. I hope that the fix about the multi channel recognition could be seen on JRiver.

Share this post


Link to post
Share on other sites

Have you contacted Michal or Chebon. I would assume soon, since it is working fine in testing overall, with one issue to smooth out.

Share this post


Link to post
Share on other sites

Ted, have you looked into .dsf as a multi-channel format? It's specified as stereo only, and I have not tried to convert a 5 channel .dff file with Audiogate to see what it does with it. It's on a machine currently taken apart.

Share this post


Link to post
Share on other sites
Ted, have you looked into .dsf as a multi-channel format? It's specified as stereo only, and I have not tried to convert a 5 channel .dff file with Audiogate to see what it does with it. It's on a machine currently taken apart.

 

Tom, as per above..all I use is DSF in multichannel. The files are huge (cuz they are decompressed DST often) but play wonderfully even on my minimalist CAP V2+. And they have all the tags, etc. JRiver sees them perfectly.

 

Conversely, i tried playing ISOs directly but my small server chokes on them cuz 90% of the time they are requiring the cpu to do DST decompression, which it's not built for that kind of load. Maybe evn a RAM increase would help, but what the hell...storage is cheap.. :)

Share this post


Link to post
Share on other sites
Ted, have you looked into .dsf as a multi-channel format? It's specified as stereo only, and I have not tried to convert a 5 channel .dff file with Audiogate to see what it does with it. It's on a machine currently taken apart.

 

No it's not stereo-only, DSF supports mono, stereo, 3.0, quad, 3.1, 5.0 and 5.1... DFF can support the same, but also in addition 2.1.

 

So both DSD file formats are perfectly ready for any pretty much any channel configuration up to 5.1. (so all the same as SACD)


Signalyst - Developer of HQPlayer

Pulse & Fidelity - Software Defined Amplifiers

Share this post


Link to post
Share on other sites

Thanks guys! I was reading the DSD Disk spec, which as I understand it, was the genesis for .dsf, and that's 2 channel only. Then AudioGate should be able to do the 5 channel conversion from .dff to .dsf.

 

Thanks again!

Share this post


Link to post
Share on other sites
Thanks guys! I was reading the DSD Disk spec, which as I understand it, was the genesis for .dsf, and that's 2 channel only. Then AudioGate should be able to do the 5 channel conversion from .dff to .dsf.

 

Thanks again!

 

I'm not sure Audiogate can convert more than 2 channel files. i could be wrong; never needed to.

Share this post


Link to post
Share on other sites

It's not a big issue. Pyramix 8 with DSD support is due out for release mid April, and it does support .dsf now, in addition to .dff. I just have a few projects I'd like to complete before 8's release.

Share this post


Link to post
Share on other sites
Any idea when the new firmware will be available for the Mytek that allows a person to sync the clocks via USB?

Ted - I haven't heard from anyone. Have you heard any news on this topic? Thanks.

 

David

Share this post


Link to post
Share on other sites

No news yet, but remember, mine was early beta. So, simply use the existing firmware and drivers (or ask Mytek for the beta if clock synching is mandatory).

Share this post


Link to post
Share on other sites

Thanks Ted. Do your Myteks get very warm stacked on top of each other? I have the two stacked and just wondering if it would be an issue. Mine feel pretty warm but I'm out of real estate :-)

Share this post


Link to post
Share on other sites

Hi Ted and everybody

 

Pls see this video explaining the same DSD surround setup as shown at Mytek Room at Axpona 2013 in Chicago

 

 

 

 

Best regards, Michal at Mytek

Share this post


Link to post
Share on other sites

I am helping David (dlbeck) on his setup, so i threw this picture together to make a little more sense. Firmware and driver are beta but will be released soon. They fixed a PCM channel swap issue we were having (easily remedied in JRiver but better not to have).

 

mytekstack setup.jpg

Share this post


Link to post
Share on other sites

 

[ATTACH=CONFIG]4963[/ATTACH]

 

Interesting. Keeps it asynchronous I suppose at the cost of some setup, an option to run all in sync mode might be nice.

 

I think this has inspired me to create my own single board multi-channel DSD demo...

Share this post


Link to post
Share on other sites

Hi,

So, any news?

Is it ready to public release?

Thanks!


Synology DS1815>Cisco Switch>CAPS Pipeline Win7/10 x64 > Foobar/AlbumPlayer/JRiver MC > ASIO > Dac: exaSound e28 > Speakers: Focal SM9 and Twins Be6 in 5.1 > HeadAmp: Woo WA22 > Cans: HD800 (Bal)/Focal Uthopia > Portable: Iphone X> Shure SE530PTH

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×
×
  • Create New...