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realDHT

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  1. I remember from Andreas measurements last group buy that the phase noise for the 5/6 Mhz SC-cut was actually very similar to the PN for the 11/12 Mhz. Then there was a big increase in PN up to the 22/24 Mhz SC. So based on this, i'm guessing that a 10 MHz SC cut / Driscoll oscillator will have the best performance.
  2. This looks to be a fairly high quality RCA switchbox: https://www.ebay.com/itm/192864171577?_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D232195%26meid%3D122b5be7179346d4a059a0b830e4ec7d%26pid%3D101195%26rk%3D1%26rkt%3D12%26sd%3D284246139866%26itm%3D192864171577%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplAMLv9PairwiseUnbiasedWebWithSearchFilterPromotion&_trksid=p2047675.c101195.m1851&amdata=cksum%3A192864171577122b5be7179346d4a059a0b830e4ec7d|enc%3AAQAFAAACEClKviNOdewYUBffQVCCI2t2UH65%2BGLEzS88JNzc3G9KoPgmfUFC6HTUubVM1cj1KavzFCKmsAzut1k134GZwW6ARRxQ81mSdRMfiLXG
  3. Another thing that Lynn Olson argues in the text I linked is also very true in my experience: measurements at "the box level" usually does not correlate much at all with audio perception, so they tend to be rather meaningless. On the other hand, during development, measurements are very powerful tools to evaluate a design change, subcircuit etc, provided the designer has skills and experience to select the right measurements and correlate them with perception.
  4. Yes agree 100% with you guys on this. We really don't need to complicate it for ourselves when evaluating..either it moves us, or it doesn't. If it does not move us when listening, it is not good no matter what, even if it has the best "tight bass" and "extended hights" Lynn Olson described it very well "What do audio systems do? At the most basic level, they are Illusion Engines. I'll repeat that: a hi-fi system is really an Illusion Engine, a type of mechanical contrivance that hypnotizes the audience into thinking musicians are somehow present (or at least nearby). If the
  5. John told me earlier it runs at 200 MHz.
  6. Great news. Very interesting! And interesting news that ECD are designing a complementary tube amp too. So if I understand you correctly, you think the powerdac + rasperry is better than the UPL + fractal DAC in subjective listening tests? How much better would you say it is? Is it sort of a "must-do-upgrade-immediately" :) or just a little bit better in your opinion?
  7. Just because you are not able to understand it does not mean that it is technical BS.
  8. I did not say anything about jack reliability in my post. It is not "stupid easy for anyone" to change a jack by the way. You would have to dissassemble the dac and desolder it from the board. If you can do that easy, then you can just as well install a new jack somewhere and connect it with cables to the board. And the powerdac R is NOT a combined DAC/headphone amp, John stated that clearly in the blog.
  9. Yep I would be interested in hearing his feedback when you get it. Meanwhile I'm just guessing: The common 5V 250mA might be actually the same PSU as is delivered for the DA96? The power D/A converter is probably the power resistor ladders, not including the rest of the D/A board. And probably the novel PSU he was talking about is directly associated/integrated with the power D/A circuit and internal of the design.
  10. I read their update now. Good that they confirm they have tested 32 ohm phones successfully. Then we know it will indeed work well for most phones out there.
  11. I am thinking if you are selling a commercial product having a headphone jack, it must work well with all, or at least most of the headphones on the market. Even if you inform on the webpage it will only work for some phones, it might give you badwill and confusion amongst customers when they connect their unsuitable headphones..
  12. Actually with this in mind it does make sense not to have a built in headphone jack.
  13. As I remember it it was 10 steps for the R version and 13 steps for the speaker powerdac.
  14. Agree, and we should keep in mind that this new Powerdac R has around 30 Ohm output impedance so probably it will not work that well with 32 Ohm headphones. In my opinion it is more a normal DAC but with easy-to-drive-headphone compatibility. The better drive capability compared with the current generation fractal dac would still be a nice thing for line level use.
  15. The design reminds me of some B&O products (famous for their designers by the way 😉) https://www.beoworld.org/prod_details.asp?pid=953 Agree that the recessed RCA contacts could be a problem.
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