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Author Topic: Schiit Yggdrasil DAC Review (pre-production): a short preview of your next DAC  (Read 80229 times)

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zerodeefex

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Re: Schiit Yggdrasil DAC Review (pre-production): a short preview of your next DAC
« Reply #220 on: March 07, 2015, 05:22:14 AM »
Quote from: jexby on March 07, 2015, 04:26:52 AM
Except that Ravi might well have Natalie Merchant in his living room.
 :-00

I tried to invite her over but my wife vetoed that.

I've been getting a behind the scenes play by play from Marv for the past few days. Jealously faded quickly and now I'm genuinely happy he's enjoying it so much. It's like seeing your buddy with the gal or guy of his dreams (who is also super duper hot) and he's totally happy while you've got a rocky love life: at first you envy that happiness a teeny little bit but you quickly are happy that a bro is happy.
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Anaxilus

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Re: Schiit Yggdrasil DAC Review (pre-production): a short preview of your next DAC
« Reply #221 on: March 07, 2015, 05:56:59 AM »
Get a room.  :vomit:

Keep it up and CeeTee is going to break up with you.
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zerodeefex

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Re: Schiit Yggdrasil DAC Review (pre-production): a short preview of your next DAC
« Reply #222 on: March 07, 2015, 06:12:24 AM »
Quote from: Anaxilus on March 07, 2015, 05:56:59 AM
Get a room.  :vomit:

Keep it up and CeeTee is going to break up with you.

Awww, how cute. Anax is afraid of fuzzy feelings.
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Marvey

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Re: Schiit Yggdrasil DAC Review (pre-production): a short preview of your next DAC
« Reply #223 on: March 07, 2015, 06:14:15 AM »
CT babysits my kids online in CoC.
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mikemoffat

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Re: Schiit Yggdrasil DAC Review (pre-production): a short preview of your next DAC
« Reply #224 on: March 07, 2015, 06:31:16 AM »
For non Marv completists who do not keep up with all of his threads:

 The DAC in the Yggy is an AD5791BRUZ - Headline specs:  1 ppm 20-Bit, ±1 LSB INL.  I use 2 per channel (1 per phase) to get an honest 20 bit level of performance.  That is four per Yggy.  The BRUZ version is the higher specced model.

 Only 20 bits you say?  You can get a 24 delta sigma bit (advertised) DAC  chips for 3% of the cost of one 5791.  Check it out.  Go to Mouser or Digi-Key and see how much AD5791s cost.  Yup, you get just about $400 worth of DAC chips in every Yggy.  I have seen $10,000 dollar D/A converters with $22 bucks worth of dac chips inside.  The Yggy is by far away the best fucking parts cost deal going in the arena of high end DACs, period.

Biggest problem was figuring out how to get it running without glitching - sample and hold amps sound like ass.

Also you have to drive it with DSP because every sample requires a fixed preamble.

For the above reasons, I don't expect a lot of competitors to be using it.  After all, even analog devices told me it was not designed for audio.  The best way to get me to do something is to tell me I can't or shouldn't do it.

Couldn't resist grandstanding -- sorry!
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thune

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Re: Schiit Yggdrasil DAC Review (pre-production): a short preview of your next DAC
« Reply #225 on: March 07, 2015, 09:28:39 AM »
Chips? Bah! I want to know about the "secret burrito" FIR filter that is of a class that preserves samples (so f(0)=1 and f(t)=0 for integer |t|>0), but it isn't a sinc-filter or a typical minimum-phase one.  Enter the magic unicorn burrito phase sauce selected by the Gods! My guess (given the 'divide-by-zero' anecdote) is a minimum-phase filter in the analog/Hilbert-Bode sense* (not the usual discrete-time sense). But I have no idea.
Jedi master tricks aside, the curious pirates have not forgotten about the filter.  :wheel:
But enough of that, back to the business at hand. :money:

*Section III, equations (9)

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Tachikoma

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Re: Schiit Yggdrasil DAC Review (pre-production): a short preview of your next DAC
« Reply #226 on: March 07, 2015, 11:33:17 PM »
Quote from: mikemoffat on March 07, 2015, 06:31:16 AM
For non Marv completists who do not keep up with all of his threads:

 The DAC in the Yggy is an AD5791BRUZ - Headline specs:  1 ppm 20-Bit, ±1 LSB INL.  I use 2 per channel (1 per phase) to get an honest 20 bit level of performance.  That is four per Yggy.  The BRUZ version is the higher specced model.

 Only 20 bits you say?  You can get a 24 delta sigma bit (advertised) DAC  chips for 3% of the cost of one 5791.  Check it out.  Go to Mouser or Digi-Key and see how much AD5791s cost.  Yup, you get just about $400 worth of DAC chips in every Yggy.  I have seen $10,000 dollar D/A converters with $22 bucks worth of dac chips inside.  The Yggy is by far away the best fucking parts cost deal going in the arena of high end DACs, period.

Biggest problem was figuring out how to get it running without glitching - sample and hold amps sound like ass.

Also you have to drive it with DSP because every sample requires a fixed preamble.

For the above reasons, I don't expect a lot of competitors to be using it.  After all, even analog devices told me it was not designed for audio.  The best way to get me to do something is to tell me I can't or shouldn't do it.

Couldn't resist grandstanding -- sorry!


Hee, picked up another $10 for my Yggy fund.
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Marvey

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Re: Schiit Yggdrasil DAC Review (pre-production): a short preview of your next DAC
« Reply #227 on: March 08, 2015, 09:12:13 PM »
Quote from: thune on March 07, 2015, 09:28:39 AM
Chips? Bah! I want to know about the "secret burrito" FIR filter that is of a class that preserves samples (so f(0)=1 and f(t)=0 for integer |t|>0), but it isn't a sinc-filter or a typical minimum-phase one.  Enter the magic unicorn burrito phase sauce selected by the Gods! My guess (given the 'divide-by-zero' anecdote) is a minimum-phase filter in the analog/Hilbert-Bode sense* (not the usual discrete-time sense). But I have no idea.

I do too. But Jason's left hints: 1) Closed-form. 2) Maintains original samples. That basically tells you a lot! If you know your math and algorithms.
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cizx

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Re: Schiit Yggdrasil DAC Review (pre-production): a short preview of your next DAC
« Reply #228 on: March 08, 2015, 09:44:49 PM »
Quote from: mikemoffat on March 07, 2015, 06:31:16 AM
For the above reasons, I don't expect a lot of competitors to be using it.  After all, even analog devices told me it was not designed for audio.  The best way to get me to do something is to tell me I can't or shouldn't do it.

No one at ADI should be trusted.
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cizx

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Re: Schiit Yggdrasil DAC Review (pre-production): a short preview of your next DAC
« Reply #229 on: March 08, 2015, 10:09:35 PM »
Oh, can I get a discount on an Yggdrasil if I ship you a few AD5791BRUZs? ;)
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