Oh, the most trendy thing in R2R DACs is discrete implementation, not using an existing chip. Chord is a great example. As are countless ones. Chip-based ones tend to show more in budget products than high-end.
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Review and Measurements of Holo Audio May --- Probably the best discrete R2R DAC
- Thread starter WolfX-700
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Killingbeans
Major Contributor
Yes, I thought they used an FPGA implementation of Delta-Sigma?
Ah yes. Temporary brain failure. Sorry.
Killingbeans
Major Contributor
Don't blame ya. You have a lot on your plate 
restorer-john
Grand Contributor
Killingbeans
Major Contributor
Some with PHz bandwidth?
It's not a chip. It's a PCB with individual, surface mounted resistors. If May is anything like the original Holo Spring, it should have two resistor ladders, one used in a scheme to compensate for the errors in the other. At least that's how Jeff Zhu, the designer described it.
I had no idea, guys. So Chord is an R2R implementation?
solderdude
Grand Contributor
Chord is an DS implementation but not using standard DS DAC chips but their own constructed one using an FPGA.
They measure quite well but are expensive but so is this one.
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restorer-john
Grand Contributor
He wasn't suggesting that. What point are you trying to make by telling him "you should know better"?
It is a waveform, devoid of pre and post filter effects, something rarely (if ever) seen in a domestic digital product. It would be fun (not that listening to square waves is fun) to compare using suitable ancillary gear so as to preserve as much of that as possible, don't you think, for the purposes of a blind test? What about a series of sample impulses?
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The word without pre-ringing it has nothing to do with R2R vs DS.
restorer-john
Grand Contributor
And who doesn't know that? Ever since (and prior to) the introduction of the Compact Disc we've had pre-ringing and post ringing (from Philips' o/s chipset) and post ringing from Sony et al, with R2R D/As.
It's the "you should know better" I find disingenuous.
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Peace my friend we have a one of those chat group misunderstandings here, pma is an old friend I was just tweeking him.
restorer-john
Grand Contributor
OP
- Thread Starter
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OK, wow, those are spectacular. What are we looking at and what do you learn from it? <need popcorn >
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