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PeterSt

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  1. A great interview. Thanks ! And the only person I can think of to refuse to write about our DAC because he instantly heard how the speaker we used at some US audio show, distorted in the tweeter. Imagine : ahead of the show we tweaked and tweaked and tweaked to make that speaker sounding right ( I should be able to find photos of what we all did to that for the given (to us) speaker for this show). We were quite nervous at explaining to every one requiring it, that something was wrong with the speaker and it surely wasn't our DAC (such a weak excuse !). But John, out of all, worked the other way around: he was comfortably assuring me that no review etc. was possible with these speakers. And I wondered how the heck he came to that conclusion seconds after he walked into our room. If I only would allow myself to put up the photos at the end of the show, we all literally rolling on the floor of laughing because of having so much after-show fun. Out of respect I always kept them hidden on my hard drive.
  2. Yea, cool. Do you have a use case for this ? Apologies for being serious. Speaking of that, is this the spray you used ?
  3. I wish I made photographs of all the (very low voltage) fan means I applied to the cooling part. So the Peltier element would cool itself. It always worked ... ... temporarily. Next up : perpetuum mobile
  4. You bet. But I'll start with sound quality. I am really used by the other way around by now. So yesterday I deliberately did not start this software process (of the next 24 hour implying playback). Sound is really more "relaxed" because of this. This, while I know for 5-6 years by now that in my specific situation, playback needs to commence for ~20 minutes to develop a balanced sounding operation. With the 24/7 thing this indeed lacks (no difference audible for whatever next minutes of inital playback). But doing nothing (the past 24/7) is also not good (again, in the situation I have at hand here). So it is all quite sensitive. The Peltier solution can be tuned to the most sensitive temperature setting with resistors (I did not try, but is should work).
  5. Btw, don't underestimate other sources of influence because of heat. Of course it depends completely on the design. But for example, the DC Offset measured at a DAC output is always subject to heat somewhere along the chain (within the D/A process, including the gain stage). DC Offset also applies to a differential setup, where it manifests in THD aggressively (plus and minus are influenced differently). So this is now now expressed in THD per D/A element (like a mono channel chip) but to the net result (plus and minus fighting).
  6. Try it. With really low TDP (like measuring 25C or so at the chip's surface) continuous operation on any of the chips, no continuous use would show a higher temperature. Still, running that for 24/7 will degrade THD by the ever so slightest means (like 0.002dB or so). This is audible like crazy (perhaps because of means beyond my knowledge). You applied it the other way around: cool the chips to a relevant degree, and measure a sheer 5dB of less THD. I believe you without checking. Btw, 5dB is rather much, but easy to accomplish by this aggressive means (like a heat source would do it the other way around I guess). So yes, it is the way to go. I am quite confident of that.
  7. Same here. Worked for weeks on it. We may well say that the efficiency of it is too low. Also, ambient "leaks". It requires thermal isolation beyond normal means. A bit hard to explain, but I think you will understand what I mean.
  8. From close to the past year of "development" (and public forum posts about it) I by now have the proof the other way around: heating up the lot by means of break-in which can be repeated each and every day, deteriorate THD. Heat-up: not measurable by thermal measurement (unless by means of whatever behind the decimal point). Break-in: Just keep the lost under normal playback means and constraint / strength (mimic impedance is tough without sound). So all 'n all, software-wise I have created a repeatable situation (measured on a per day term) that keeping all under the tension of 24/7 payback, deteriorates sound. The other way around seems obvious indeed. But for me a long shot because e.g. heating up the lot with a föhn, surely does not speed up real breaking-in. I have all that stuff laying around and will apply that to the D/A chips readily tomorrow now. FYI (again): I have been testing with this idiocy for almost a year by now (software incurred). So it is high time to apply the opposite. Funny thing is that this afternoon I was discussing the invention of the Warmth Wheel and mentioned Peltier and how it works. Time to have a real application for the latter. Or at least a test of it for the better SQ.
  9. FYI: A bit depending on the software version (hence the year we look at), encrypted files (feeds) can't even be stored. They need decoding first and then can be stored (and that goes by A/D). Versions that could store encrypted files have existed, but then they had to be decoded within 24 hours, or you'd lose them. The decoding was a separate process (a "run"). All sh*tty stuff. Why is all on YouTube free ? (at least I think it is) ... because it is all as lossy as hell. I know, this is not A/D stuff, but still the answer to your quest.
  10. Yea, that's what you would logically say. But it isn't so. Again this depends on what actually happens and additionally whether encryption is in order or not (and do note that the encryption is dedicated to our places over here (Canal Digital)). I am fine with the thought that all is recorded digitally and no A/D - D/A is in order, but then they compress more on the D-D job. One way or the other, it is about the number of stages under way. And YouTube is special anyway (and not for the better).
  11. This is what XXHighEnd would show you, when it is so. It is my understanding that the current "standard" (a convention) depicts that there's always an upsampling step in order when the file is under 88.2 sampling rate. I (XXHighEnd) don't comply to that ... (and you (XXHE) would upsample yourself anyway, per your own means and up to the rate your DAC can handle).
  12. PS: Encryption is also a deteriorating process, but it depends a bit on where it happens (we have the decoding in the set-top boxes, which is a pain in general).
  13. Maybe it is about the number of A/D - D/A stages the feed goes through (which includes your home appliance). I have already mucho difficulty with recording the program say 20 minutes ahead in order to skip advertisements during playback. This should imply one additional A/D and D/A stage (the one in my SAT receive which can also record). Picture is poorer, but sound is so much more worse that I have difficulty to follow conversations. Having said that, to me it is totally clear that the means which has been used at the other end, is crucial to the playback quality. Over here we by now have several "missed the program" services, and they all bear another quality. Btw, because this is so, I don't pay attention to YouTube recordings. And oh, many real-time programmes these days, "time shift" the recording already, in case something bad happens (like Trump suddenly being shot which is not allowed to end up in the living room). These too already bear a poorer quality. All 'n all, no surprise to me. It's how it is and it won't get better.
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