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Author Topic: Not a lot of DAC talk on here...  (Read 232971 times)

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Thad E Ginathom

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Re: Not a lot of DAC talk on here...
« Reply #1430 on: August 28, 2015, 11:55:31 AM »
Quote from: Thad E Ginathom on August 28, 2015, 09:54:35 AM
I do also have Kothganesh's Bottle Head Crack here

Yes, it is a different kettle of fish with the Crack. The problem is much reduced. not entirely gone, but much less. I'm not 100% sure that the combination is my kettle of fish exactly but it looks like there is a lot to work on here. 

It's 31.5C (88.7F) ambient here just now, and today is not a hot day. That's one of the reasons I'm not wild about valves.

So, I guess the ifi is crap? hey ho... maybe. Can't afford to upgrade everything in one go. Anyway, that's verging on Amp talk...


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Azteca X

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Re: Not a lot of DAC talk on here...
« Reply #1431 on: August 28, 2015, 01:50:05 PM »
With all due respect, Thad, you have said yourself that your hearing is significantly compromised in terms of frequency response. I think this will naturally affect how much benefit you can derive from certain gear. Or perhaps since you aren't really hearing portions of the signal you notice things other would not - like if you watched one side of the TV screen you might notice background things that your eye wouldn't focus on if presented with the full frame.
Anyhow, as always, find what you like and what you can afford.
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Sphinxvc

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Re: Not a lot of DAC talk on here...
« Reply #1432 on: August 28, 2015, 03:16:34 PM »
C.A. thread from '09 on multi-bit vs. DS DACs.  http://www.computeraudiophile.com/f6-dac-digital-analog-conversion/multi-bit-dacs-vs-delta-sigma-dacs-2066/

I don't know much about the difference between the two so those easy-to-read posts by Idiot Savant were helpful, I just don't know if he knows what he's talking about.

There's something interesting in there about resistors in multi-bit DACs varying over time and temperature.  He poses it as one of the weaknesses inherent to multi-bit designs.  Is this true? 
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Thad E Ginathom

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Re: Not a lot of DAC talk on here...
« Reply #1433 on: August 28, 2015, 03:31:31 PM »
Yes, Azteca, you are right. I think it is harder to please my ears now than it was even a few years ago. 

Still have a lot of music enjoyment left, though, I hope!
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kothganesh

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Re: Not a lot of DAC talk on here...
« Reply #1434 on: August 28, 2015, 03:46:58 PM »
Nick, I'm not pressuring you at all but if you want to take an additional week with the Gungnir/BH Crack, feel free.
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Anaxilus

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Re: Not a lot of DAC talk on here...
« Reply #1435 on: August 28, 2015, 05:32:08 PM »
Quote from: Sphinxvc on August 28, 2015, 03:16:34 PM
There's something interesting in there about resistors in multi-bit DACs varying over time and temperature.  He poses it as one of the weaknesses inherent to multi-bit designs.  Is this true? 

Yes. Seems like the best solution would be a MB architecture that avoids a discrete network of hand matched resistors with lots of potential variability over time. ;)
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Thad E Ginathom

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Re: Not a lot of DAC talk on here...
« Reply #1436 on: August 28, 2015, 05:40:15 PM »
Quote from: kothganesh on August 28, 2015, 03:46:58 PM
Nick, I'm not pressuring you at all but if you want to take an additional week with the Gungnir/BH Crack, feel free.

Cheers and thanks  :)p7
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aufmerksam

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Re: Not a lot of DAC talk on here...
« Reply #1437 on: August 28, 2015, 05:48:18 PM »
Quote from: Anaxilus on August 28, 2015, 05:32:08 PM
Yes. Seems like the best solution would be a MB architecture that avoids a discrete network of hand matched resistors with lots of potential variability over time. ;)

This http://soekris.com/products/audio-products/dam1021.html is the kind of "discrete" set-up anax is talking about; it is most susceptible to the issues raised by idiotsavant in that thread at CA. The AD57x1 chips in the yggy and gumby don't use discrete resistors. The issue with voltage values is still valid since it is how r-2r fundamentally functions, but can be addressed with better implementations.
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mikoss

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Re: Not a lot of DAC talk on here...
« Reply #1438 on: August 28, 2015, 05:53:52 PM »
So, I'll just bring up that there are comments from people who may be biased/butt-hurt against Schiit/whatever, claiming that AGD-19 is better than Gumby... just wondering if anyone's had a chance to compare the two. I recall reading some comments about the PCM-1704UK in the old DAC thread, but don't really remember much, as the thread kind of disintegrated. Anyone care to summarize? Personally, I'm just asking for info... I'm going Gumby myself, just thought it might be useful to get objective opinions on the DACs for people who are interested. I think we have a more objective voice here that could potentially be useful for others.
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Priidik

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Re: Not a lot of DAC talk on here...
« Reply #1439 on: August 28, 2015, 08:16:49 PM »
Quote from: Anaxilus on August 28, 2015, 05:32:08 PM
Seems like the best solution would be a MB architecture that avoids a discrete network of hand matched resistors with lots of potential variability over time.

I have tortured my Dam more than is expected from a tough design and it still held strong against Yggs. I guess i will see (hear) how it stands against time. Discrete resistors can withstand time-strain as well as laser trimmed ic-s, why wouldn't they? It's more about their standard precision spec that is lacking a bit vs IC-s.
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