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Hello, Thanks. To point out, listening tests was peformed with matches levels, 115 mV. Problem arrose with level matching with tube amps later on. I have contacted bottlehead and they suggested to load the headphone output when measuring - which I did not do beforehand. will test that later...

Please help me on that. What I did is take a ripped cd, .flac format, but 30 seconds of it using audacity and exported to VAW. What exactly should I be comparing to what?

Hi, 1) Yes, load (headphones) connnected to the amps too. 2) That was done in a following manner: 10 swiches between different sources per song, subject knows that each time its an different source. Subject needs to determine which source is which. 3) Most important difference with my ears was...

Hello Stanroz, Just to point out, that in this comparison test both me and another "subject" were able to accurately say which one of the systems was playing. So I would say both the difference and sound signature could be determined on this one. ABX no doubt would be harder.

Hello all and thank you again for active participation: This Friday evening I came in much better prepared: four songs clipped @ 30 second samples, same source (iPhone 13Pro using VLC), two systems to compare (Chord Dave vs Apple Lightning Dongle), volume matched using a small portable scope +...

That was done using the Topping. I've also tried apple dongle with similar results. Will try on Chord Dave and Chord Mojo later this week, however I don't expect miracles. Could identify 1ms delay sound though MacBook speakers.

Well I tried to perform some more testing.. Laptop speakers 1ms/2ms/5ms 10/10. But 5ms is the one I can hear. Others are for me were plain different sounds, not a differentiable delay. So really agree with your opinion that there might be something more to it.

Chord 2Go/2U audio player was used as a digital source for Chord Dave and Topping D90 DAC's, Iphone for Chord Mojo and Lighting dongle. Do you see large downsides for using Ipad or Iphone as a source?

5ms 7/10 was the best I could do.

I performed the using the Topping D90 + Topping A90 + HD650. USB output from my old Macbook pro, if it does matter. The room I performed the test was far from ideal, kitchen machine running, HVAC on etc.. After tiring hour of sine waves, results are: Audiocheck I post the test that I have...

Really appreciate the support.

My bad, pardon.

Seems to be a nice little kit, I guess the inner wiring is similar. Can you share your experience on do you hear the difference between it being in the signal path or bypassed? Testing blindly I could not tell with mine.

Thank you all for participating in this thread. I know some of the topics are quite heated, and I need to remind everybody that is is purely My own experience with my setup and personal limitations that does not apply to your ears or your systems. Throughout the discussions I have already...

1) Pink noise, however, to level match it, we used audacity recording input graph and were setting it to ‑10dB. This Friday we will perform adjustments using a scope on the headphone output voltage, as it has been pointed out that is more precise. Again, from the listening perspective, it seemed...

This all started with helping hands switching between sources and the switch box. Once we we not able to tell the difference that switchbox is within the circuit, we moved to a 4-to-1 setup to continue our investigation. On Friday evening I will try to document and upload some pictures/info on...

Its a tough one to swallow, I still need to comprehend it. Somewhere deep I still blame the "mid-tier" HD650, although they have given me many, many hours of hi-fi pleasure. Soon to perform a test with Audeze LCD-5 to fully seal the deal on the DAC selection..

Thanks for the moral support. My wife reaction was "if it measures better, it must be better, even though none of you can tell the kits apart". As long that don't purchase on credit or prioritize snake-oil cables over a family holiday my marriage is still strong.

Thanks for replying, I shall. Also will perform the suggested hearing threshold testing sequence on my free time. Well at least I can tell the difference in different headphones, as the blind testing.. is impossible with them!

The switch was built not bought, aluminum enclosure, 4x 6.3mm inputs 1x 6.3mm output. This: https://www.lemona.lt/Files/Instrukcijos/TI/En/Pdf/Galetiniai.pdf was used for the switching, 3 pole 4 way version. I have tried similar experiment with direct cabling, the switch box really does not...