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More => Old Versions => JRiver Media Center 19 for Mac => Topic started by: BillyD on December 29, 2013, 05:39:46 pm

Title: Feature request: 2xDSD using 2-wire (4-channel) DoP
Post by: BillyD on December 29, 2013, 05:39:46 pm

Hi, I have a Mytek Dac that only supports 2xDSD over DoP with the so-called 2-wire scheme introduced in the DoP 1.1 spec. It uses 4 x 24 bit samples at 176.4Khz to carry 2 x 1 bit samples at 5.6Mhz. By playing 4 channel .wav files cobbled together from Audiogate's 5.6Mhz output, I found the sound significantly improved over 1xDSD. Is there any chance you can add this feature to the list of Output Encoding methods so I can listen in real time?

Many thanks!

P.S. The Mytek does support 352.8Khz DoP on Windows via USB, but on the Mac, DoP is currently (permanently?) limited to 176.4Khz / firewire.

Title: Re: Feature request: 2xDSD using 2-wire (4-channel) DoP
Post by: JohnT on December 31, 2013, 10:16:09 am

I'll wait for Matt to weigh in on this.  The JRiver office is closed until January 2nd, so please check back later. Thanks.

P.S. Have you tried the Mytek on Mac via USB?

Title: Re: Feature request: 2xDSD using 2-wire (4-channel) DoP
Post by: BillyD on January 04, 2014, 12:43:00 pm

> P.S. Have you tried the Mytek on Mac via USB?
Yes. When 2xDSD over DoP output is tried, I get the same message as with Firewire: "Playback could not be started on the output 'Core Audio' using the format 88.2KHz 64 bit 2ch'." When I try a 4-channel .wav file containing DoP encoded 2xDSD (with no output encoding in MC), the Audio Path report says something like "4 channels are being converted to 2 channels" and I hear only a hiss.
1xDoP output encoding DOES work over USB, contrary to what I stated in my P.S. above. It's just that 4 channels will not pass via USB while they will via Firewire.

Title: Re: Feature request: 2xDSD using 2-wire (4-channel) DoP
Post by: BillyD on February 22, 2014, 07:39:17 pm

Hello? John? Matt?

Is there any news on this?

Title: Re: Feature request: 2xDSD using 2-wire (4-channel) DoP
Post by: JimH on February 22, 2014, 07:59:22 pm

http://yabb.jriver.com/interact/index.php?topic=86462.0

Title: Re: Feature request: 2xDSD using 2-wire (4-channel) DoP
Post by: BillyD on March 22, 2014, 10:23:44 pm

Thankfully it sounds like Matt is making a spectacular recovery from his horrifying accident.  Fortunately for me and him, this thread does not need to lengthen his backlog. The new Mytek Mac USB driver and 1.7.6 firmware supports 2xDSD over DoP.  It would be nice to have 2xDSD working with firewire also, but for Mytek owners it should be much less important now. Depends on how many other DACs need 2-wire/4 channel DoP.  Best wishes Matt!