Craig Sawyers Posted December 23, 2016 Report Share Posted December 23, 2016 I completely agree that a chip, or hybrid solution would be best. In fact the concept of using a laser trimmed metal foil R2R network, where the foil network was layed down by photolith ought to be superb, hermetically sealed and dry nitrogen filled. Cheap it would not be... 2 Quote Link to comment Share on other sites More sharing options...
joehpj Posted December 23, 2016 Report Share Posted December 23, 2016 (edited) Although DF1704 TI paired with PCM1704 has been outdated and surpassed by FPGA based digital filter, PCM1704 is still a very good chip even after over 10 years of production. Sad to be obsoleted. As I know, TI stopped all audio R2R chip production. So we have to look into discrete design or use AD chip sth like Schiit used. Even for AD5791, it is only 20bit so when playing 24bit data, some calculation must have to be done. Edited December 23, 2016 by joehpj Quote Link to comment Share on other sites More sharing options...
Sechtdamon Posted December 23, 2016 Author Report Share Posted December 23, 2016 (edited) I have a DAC based on AD1862 (20 bit) and I like it better than a same DAC based on PCM 1704, by a lot. Actually I don't really understand why people treat PCM 1704 as it is the best R2R dac chip ever. Engineered better? Sound wise better? All Sigma-Delta Chips are using that calculations to decode PCM, the highest bit of a hybrid Sigma-Delta chip has as I know 6 bits. So if you do not have any problem with it, why do you think about 20 bit R2R dacs has problems with decoding 24 bit? cuz they are already outdated, cuz you care about the remaining 4 bits is left behind? If a dac can decode 20 bits perfectly, IF, I do not hecking care about the remaining 4 bits. Anyway, what I extremely curious about is this: http://www.transient-audio.nl/DAC_TWO.html Are they using on shelf dac chips in it with a simple closure? WTF is in that closure? Anyone got some info abou it? Edited December 23, 2016 by Sechtdamon Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted December 23, 2016 Report Share Posted December 23, 2016 my guess is that the transient part is all discrete, and very similar to the soekris with fewer bits. and like the soekris, opamps to do the se to balanced, and more opamps to do the filter. there are no off the shelf 24 bit dac chips. if there was, things would be much easier regardless of their price 3 Quote Link to comment Share on other sites More sharing options...
wink Posted December 24, 2016 Report Share Posted December 24, 2016 9 hours ago, Craig Sawyers said: I completely agree that a chip, or hybrid solution would be best. In fact the concept of using a laser trimmed metal foil R2R network, where the foil network was layed down by photolith ought to be superb, hermetically sealed and dry nitrogen filled. Cheap it would not be... ... and encased in a crystal controlled oven to negate any temp drift.... Quote Link to comment Share on other sites More sharing options...
joehpj Posted December 24, 2016 Report Share Posted December 24, 2016 9 hours ago, kevin gilmore said: my guess is that the transient part is all discrete, and very similar to the soekris with fewer bits. and like the soekris, opamps to do the se to balanced, and more opamps to do the filter. there are no off the shelf 24 bit dac chips. if there was, things would be much easier regardless of their price PCM1704 was a 24bit dac. But the ENOB was less than AD5791. Why is that different? Quote Link to comment Share on other sites More sharing options...
Sechtdamon Posted December 24, 2016 Author Report Share Posted December 24, 2016 15 hours ago, kevin gilmore said: my guess is that the transient part is all discrete, and very similar to the soekris with fewer bits. and like the soekris, opamps to do the se to balanced, and more opamps to do the filter. there are no off the shelf 24 bit dac chips. if there was, things would be much easier regardless of their price That was the point I wanted to reach Dr. Gilmore, thanks. Quote Link to comment Share on other sites More sharing options...
lostinaudio Posted December 31, 2016 Report Share Posted December 31, 2016 Interesting thread guys. The Chip type (in R-2R) as we are talking here does seem to have an effect on the sound. And I guess discrete different again, quite possibly surpassing a chip? But the effect of the filtering used and the quality of the power supply and output stage after the chip also has a big impact IMO. Having trawled through various R-2R DACs in the past it seems that has a marked effect on the sound you will get. Quote Link to comment Share on other sites More sharing options...
NoFeedback Posted January 7, 2017 Report Share Posted January 7, 2017 http://audio-gd.com/Master/Singularity19/Singularity 19EN.htm This one looks very interesting, 600/650usd only. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted January 7, 2017 Report Share Posted January 7, 2017 (edited) so the 2 piece version will be capacitor coupled output, the 4 piece version will be dc coupled output, the newest version of cast and cascode fet buffer. for balanced you will need 8 pieces. i'm sure a version of this is coming. as far as I know, no dsd but it should be capable of that. pricing is finally rational Edited January 7, 2017 by kevin gilmore 3 Quote Link to comment Share on other sites More sharing options...
mypasswordis Posted January 18, 2017 Report Share Posted January 18, 2017 Been going through some of the old threads on old multi bit dacs. Is Filburt's favorite opamp THS4032 (with the fancy decoupling) still the one to go for if you have to settle for an opamp i/v? Or are there other opamps that are better now? I haven't been able to get Filby's modded Assemblage sound out of my head, ever since I listened to it. Quote Link to comment Share on other sites More sharing options...
Pars Posted January 18, 2017 Report Share Posted January 18, 2017 That is what I used on my Rotel 991 (still haven't gotten around to discrete in it yet) along with 8xxx for the buffer/SE ->bal. It was touchy for decoupling. I used the Aries DIP adapters with on pin decoupling and no sockets for the 4032s.Sent from my iPhone using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
mypasswordis Posted January 18, 2017 Report Share Posted January 18, 2017 Awesome! How does it sound? And what discrete i/v were you planning on using? You wouldn't happen to have some of the borbely stuffed saved up would you? Quote Link to comment Share on other sites More sharing options...
Pars Posted January 18, 2017 Report Share Posted January 18, 2017 It sounds good, probably not as good as my 855 with an rbroer (diyaudio) discrete, but much better than the stock opamps.I have one of Colin Toole's discrete stages partly built for the 991. Still haven't decided whether to leave the ad8599 (IIRC) in as the SE to bal converter or to use something discrete there.Sent from my iPhone using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
RudeWolf Posted February 7, 2017 Report Share Posted February 7, 2017 What's the latest news regarding a Denafrips DAC being spotted in Iceland? P.S. Looks like 2017 will be the year of the R2R dac. I sort of feel torn between a RME ADI-2 Pro and one of these Asian miracles. Quote Link to comment Share on other sites More sharing options...
spritzer Posted February 7, 2017 Report Share Posted February 7, 2017 Yeah I bought one... blame Kevin as he's such a bad influence on me. It's shipped but I have no idea when it will arrive... Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted February 7, 2017 Report Share Posted February 7, 2017 definitely blame me. its my fault. its always my fault. This is definitely the year of r2r and the start of the end for megabuck stupidity. 1 Quote Link to comment Share on other sites More sharing options...
spritzer Posted February 7, 2017 Report Share Posted February 7, 2017 Can I blame you too for the 150$ Wiha wire stripper I bought which really doesn't like PTFE wires? I need a new cartridge for those... It will sure be fun to compare it to the MSB. They sent me message asking for my email address so they can send me the drivers so that is a good sign. The Soekris modules are also sitting here but I have no idea what to do with them. Quote Link to comment Share on other sites More sharing options...
fat joey Posted February 8, 2017 Report Share Posted February 8, 2017 Be careful. MSB fanboy is gonna hate you guys Quote Link to comment Share on other sites More sharing options...
RudeWolf Posted February 8, 2017 Report Share Posted February 8, 2017 9 hours ago, spritzer said: Can I blame you too for the 150$ Wiha wire stripper I bought which really doesn't like PTFE wires? I need a new cartridge for those... It will sure be fun to compare it to the MSB. They sent me message asking for my email address so they can send me the drivers so that is a good sign. The Soekris modules are also sitting here but I have no idea what to do with them. That's just grand. You ninja those right before me and now they collect volcanic dust... Well, get 7-9V of AC or DC, fashion a spdif input and you should be able to have music. Quote Link to comment Share on other sites More sharing options...
spritzer Posted February 8, 2017 Report Share Posted February 8, 2017 I'll throw something together eventually as I need a balanced DAC for my test setup. What is the USB input of choice these days? Still XMOS what ever? Quote Link to comment Share on other sites More sharing options...
joehpj Posted February 8, 2017 Report Share Posted February 8, 2017 Amanero Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted February 8, 2017 Report Share Posted February 8, 2017 (edited) i use the stripmaster. does teflon just fine. justin has managed to go thru a few sets of dies, mine are still original 30+ years later, although i recently bought a new one as the handles on the old one are falling apart. Edited February 8, 2017 by kevin gilmore Quote Link to comment Share on other sites More sharing options...
spritzer Posted February 8, 2017 Report Share Posted February 8, 2017 I normally use the Wiha 36050 stippers but they do wear out after a while with the 24# teflon stuff. The Wiha 24672 is supposed to be better but I need the bloody PTFE cartridge for it... Quote Link to comment Share on other sites More sharing options...
RudeWolf Posted February 8, 2017 Report Share Posted February 8, 2017 2 hours ago, spritzer said: I'll throw something together eventually as I need a balanced DAC for my test setup. What is the USB input of choice these days? Still XMOS what ever? I'd use this - https://www.minidsp.com/products/minidspkits/nanosharc-kit You get superior DSP control, extra inputs and remote volume/input/filter control. Supposedly the DAC should be input agnostic due to FIFO reclocking. Quote Link to comment Share on other sites More sharing options...
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