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About GUTB

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  1. How was it determined that there was no time correction?
  2. It's true that MQA is lossy, but it seems that they've successfully identified what can be lost and still maintain high resolution audio. With MQA-CD specifically there does appear to be a loss of definition vs higher bitrate masters (176-384), so if it's a choice between MQA-CD and DXD or high-rate DSD than MQA-CD would be the last choice. However, high-rate DSD and DXD (or 176-192) don't have physical media (I wonder why?). So if you want physical digital media, and a lot of audiophiles (especially in Japan) do, there's 2 choices currently: SACD and MQA-CD. SACD isn't lossy, but
  3. It's not gobbledygook but rather a functional compression scheme. From my own testing MQA-CDs played back in a non-MQA system are indistinguishable from regular CDs (using the MQA test CDs) in casual listening. I haven't performed a detailed listening comparison so there may be mild artifacts. I'm actually not sure if it's just the least significant bit dedicated to MQA data. Using a MQA-CD capable system (in my case, a Mytek Liberty and a regular CD transport connected via SPDIF) the quality improvement is on the level of a 96 kHz master, and significantly inferior to high-rate DSD and DXD ma
  4. So, ESS released a new chip a little while ago, the 9068AS. This part is unique as it is the first DS-style DAC chip which has MQA unfolding built into the silicon. The Gustard DAC-X16 was the first product on the market to use this chip for $500 -- so I just had to pick one up. After a day of burn-in I sat down to test it out...and found that is wasn't detecting MQA-CD from the coax input. Reading the spec sheet for the chip it says that it unfolds "decoded MQA streams"...meaning that it doesn't decode them. It needs a first decode stage first, and as usual with these Chinese DACs that's on t
  5. Just opened it up look and I can't see them, they're fully covered by another component directly in front of them so I can't read the text on the front. I don't even know if they're regulators I just assume they are because they're attached to heatsinks. Also I've decided NOT to return the VTV. The reason is that on Audiogon someone commented that the Weiss opamps destroyed all the others and was a game-changer for him. So okay, I went and ordered some Weiss...these are very large and very expensive parts. $170 for each one, and they are single opamps meaning I need a total of four
  6. Just a note. I listened to the Schiit live Q&A session today and heard that the new Schiit CD transport is going to have a USB output capable of connecting to USB DACs. That's big, it's the only transport capable AFAIK that can do this, and there's no digital interface that I know of that offers SPDIF-to-USB functionality. That means MQA-CD is opened up to a much larger pool of MQA DACs.
  7. Oh good, they can count my potential business I may have done with them in the future gone forever. Trust is a precious commodity in this industry and if they don't care to lose it than I know where not to place it.
  8. Okay so I plugged my reference mains into the input of the 500VA balanced isolation transformer and the VTV into one of the outlets using an Audio Envy power cable. This is the transformer I have: https://aliexpi.com/ugvH Also, by happenstance, I got in a new preamp, a Mbl 6010 clone: https://aliexpi.com/pxKz The new preamp has balanced input and output and low noise / distortion specs. I thought I'd throw this into the chain as well. The Freya is high-bandwidth and has a JFET buffer stage option, but I never trusted I was getting good results from this unit. It's been
  9. I was using my reference mains which is a Lessloss level 1 filtering cable + Lessloss Firewall 64X plugged into a Furutech outlet. My listening room has only audio gear plugged in and no lights / fans turns on. I suppose I COULD try it through my 500VA balanced isolation transformer before I pack it up...but I had tested it against a stock black cable plugged into another common outlet in the room and I don't think there was any difference. On my reference there were large upgrades to sound with this setup.
  10. In reality, the sound from the Purifi is less resolving and more muddled than from the Odysseys, with or without tubed preamps and with digital or vinyl. It's not awful (after upgrading the input boards) but if you think this is high-end sound you honestly don't know what high-end sound is. Odyssey amps are good, but I've heard better. I also wouldn't describe the sound of the Purifi as being dry, cold or lifeless unlike most other class Ds have struck me as. I believe Purifi had solved that particular problem. But the death-blow to class D remains, the utter boredom and lack of engagement. I
  11. So, the Purifi is going back. After giving the new input boards and Sparkos opamps several days of burn-in after which it doesn't appear to improve any further I gave it a listen. I tried it with both the Yaqin B-2T all-tube SE preamp and my Freya using all-balanced connections. Digital is from my reference digital source (custom audio PC) to a Yggdrasil Analog 2. Also tried by vinyl system with it. Ugly midrange problem: appears to have been solved by the new input boards and opamps. Midrange quality significantly improved and is now almost as good as the reference (Odysse
  12. Right from the beginning you should hear a greater dynamic presence or "pop" from the piano on the DXD. Drumstick taps sound more "present", there's an overall sense of dullness in the MQA-CD vs DXD. Pay attention to the bass starting at 1:55 in the DXD you should hear deeper into it making it seem more present / real.
  13. That’s interesting. To me the difference between MQA and DXD was minor, but the difference between DXD and MQA-CD was pretty significant. My system for this test was my custom audio PC, Mytek Liberty + linear power supply, Mjolnir 2, TH900 with balanced cables. What were you listening with?
  14. The upgrade input boards and Sparkos opamps came in today. I installed them and the amp is now burning them in. I’ll refrain from posting early observations because those are always defunct within the first day of burning in so I’ll hold off this time. I’ll check in on it regularly to see where it’s at but I plan on giving it at least 100 hours.
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