[Nebby]

You have to factor in the cringe factor of potential customers once they hear there is a coupling cap in the design

 
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Let me ask this another way. How many of NP's "free designs" in the source/preamp/crossover category use coupling capacitors and how many of his commercial designs in this same category use coupling capacitors?

 

 

[LowPhreak]

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This is significant in that the D1 stage has been highly regarded as one of the best DAC analog stage to use for over 15 years.  There have been a lot of complex ideas floating around in the DIY community the past decade but none I have found sound as good as the D1.
 

Which is exactly why I still have my original D1 (with 24/96 upgrade), and have felt no pressing need to DIY it. 

 

[regal]

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Which is exactly why I still have my original D1 (with 24/96 upgrade), and have felt no pressing need to DIY it. 

Awesome,   Do you prefer it with the 24/96 upgrade?  I actually prefered mine with the PCM63K's.

 

[LowPhreak]

I like both versions, just different. The 24/96 seems a bit better resolution, a tad more air, but not as ballsy in the low end as the '63 version.

 

[luvdunhill]

don't underestimate the fail factor of potential DIYers.
 
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You have to factor in the cringe factor of potential customers once they hear there is a coupling cap in the design

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[Nebby]

I forgot to take that into account...touché.
 
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don't underestimate the fail factor of potential DIYers.
 

 

[samoloko]

this Is best to original d1 http://www.diyaudio.com/forums/pass-labs/34191-i-u-stage-d1-clone-2sk389-finetuned.html
try It and comment

 

[regal]

I'm thinking it may be an alternative to passive I/V for a tube DAC.   It looks like the distortion decreases exponetially with gain,  so if you set it up for a low gain and then add an anode follower it could be an altenative to the Audionot method of I/V transformers and passive I/ve keeping a lower compliance voltage on the output of the DAC.