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Need some information about DSD over HDMI

I'm not sure whether this is a really dumb or really complicated question, but I'm hoping there's an answer. I have a Cambridge Audio CXU universal player which I really like, but which doesn't support I2S. Instead, it outputs DSD directly over HDMI, but very few DACS accept this protocol. In fact, the only one I know of is Bryston's highly respected BDA3. My current DAC is an AMR DP-777 which I also really like but it's old enough that neither of these protocols are supported. My SACDs end up being internally converted to PCM by the CXU player, and output over analog connections, so the external DAC is bypassed entirely. Okay, pretty standard stuff so far, I think. However, I have lately been very tempted to try out one of the newer R2R ladder DACs from Audio-gd or Denafrips, which DO support I2S. So my question is: does any kind of adapter exist that can convert the DSD data on my SACDs to I2S format so that one of the aforementioned DACs can accept it? Thanks for helping me out with this. 
cooper52
mahler123
3,400 posts
 
Why not just by the Bryston?  I bought it precisely for this reason and then sold off my Mytek Manhattan 
fuzztone's avatar
fuzztone
5,635 posts
 
"You can wire your own."
Wrong. I can barely write any more.
Yes there is a market for HDMI/i2s adapters, it's just not a big enough market for any entrepreneurs to help us. 
You’re on your own.
"There needs to be"
Not as long as manufacturers want to keep sales in house. PS Audio pretty much invented it and it iS the most copied protocol.
I have found very few problems going i2s into their DACs.
pinwa
291 posts
 
I asked a similar question on one of the SACD groups on facebook and I was directed to a product on ebay that is supposed to extract the DSD and output it over I2S.  If you search ebay for  HDMI/MHL to IIS I2S HDMI IIS I2S Separate Extract Audio I2S/DSD/Optical/Coaxial you will get some products that claim to do this.  I ordered one from Aliexpress that should come this week so I don't know yet whether they actually work as advertised.
cooper52 OP
187 posts
 
Thanks, everybody, for the responses so far. Yes, I have of course considered buying the Bryston DAC, and though the BDA 3 does occasionally appear on the used market, it was my interest in R2R DACs that prompted my question. I'll be very interested to hear whether the adapter from Ebay actually works. I'll stay tuned.
pinwa
291 posts
 
I got the HDMI extractor today and I can confirm that it is capable of outputting a 2.28 MHz DSD signal to my D70 DAC over I2S.  The D70 requires you to set the IIS Phase to REV which I think is the PS Audio standard.  When you are sending DSD over the HDMI cable it doesn't have any audio output on the Coax or Optical connections.  But if you switch the settings for the player so that it isn't forced to output DSD then the extractor will play 176.4 Khz PCM (?) over I2S, Optical and Coax.  All of this is with the switch set to "amp".  I didn't try the other two settings.  Pretty cool for $60.   I've only had it running for a little while but it seems to work well and sound quality is good. At some point I will have to spend some time comparing the sound from the players RCA outputs to sending DSD to the DAC but my assumption is the DAC will be better but that remains to be tested.
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