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In Reply to: RE: How about a different approach: replace Juli@'s analogue PCB posted by GStew on March 31, 2009 at 20:18:25
Greg,
interesting thoughts!
Just a brief correcting remark on the ESS Sabre for now: The current version is the ESS Sabre32, it is 32 bit (not 24) and the deemphasis and FIR filters both can be disabled.
Regards
Robert
Follow Ups:
Robert,
That's good to know and I updated my post above.
Honestly, if Twisted Pear had not be out of the Buffalo DAC at the time I'd decided which one to order, I'd probably have one of them now instead of waiting for the AK4399 DAC board. I don't feel bad going with the AK4399, but I liked the maturity of their design.
Two questions I have for the group...
One, you mention that the deemphasis is defeatable. One question I have is what happens with emphasised CDs? I happen to know (because I once made a CDP based on a CDP650 that had a demph-on LED) that a few of my CDs are emphasized. Will they play wrong. It's not like I stay awake at night worrying about this, but I am curious.
Second, does anyone have any tips on programming these things. It looks like the AK4399 will need programming to set the filter bypass on... and I wouldn't be suprised if the others didn't too. I suspect that the info on how to do this is in the ESS Sabre DAC thread on DIYAudio, but I haven't taken the time to look yet.
Again, thanks!
Greg in Mississippi
Juli@'s ASIO drivers remains the best I've seen to date.
New analogue board plugs onto this using I2S interface which I assume will support 24 bit DACs only (a deal breaker for 32 bit DACs). Alfred uses this interface for the Buffalo / Sabre DAC. Alfred: can you confirm 32 interface?
I'm not religious about 24 or 32 bit: important factors are SNR and the ability to bypass internal reconstruction filter. My AA Prestige SE uses the PCM1792 DAC which is excellent. Both AKM and ESS Sabre are excellent 32 bit DACs and yes the Sabre would be a brilliant choice (even better than 1794) given that we can disable its filter and includes IV stage & PS refinements.
So lets go with the Sabre and add RCA outs as well.
Will look into Peter Daniels' work as well. DIY thread is a great start (PS - my loyalties lie with AA).
Regarding Juli@ i2s out and ESS Sabre32:
Not sure wether Juli@ i2s out will work with ESS Sabre32 "as is" right away, will have to test. If it doesn't, this can likely be fixed by choosing a different PCM audio interface format - ESS Sabre32's default is 32-bit but can be set to 24-bit by programming the registers.
Documentation is light and so far, my readings suggest Sabre 2008 allows for disabling "Demphasis" only. Can't get any info on Sabre 2018.
Just thinking aloud:
The ESS Sabre32 has 32bit PCM audio input stream as default - would it be possible and would it make any sense to have SRC resample to 32/192...? Haven't thought about this yet, but apparently Asus Xonar soundcards can output 32bit (at least Xonar DX can, see test here: http://www.atomicmpc.com.au/Review/116715,asus-xonar-dx-pci-e.aspx) - not sure if Juli@ can.
Anyone any thoughts if 32bit make any sense?
.
32 bit i2s and filter disable confirmed
Edits: 04/04/09
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