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Such as in portable DAC/amps TEAC HA-P50 and Sony PHA-1? High gain have higher output impedance? If older headphones were expected to be used with somewhat high output impedance, don't they sound their best if not using modern ultra low OI sources? Like they were designed in mind to be used...

https://www.audiosciencereview.com/forum/index.php?attachments/schiit-modi-2-uber-dac-with-topping-d10-jitter-measurement-png.12285/ what does it mean? I see the limit being -140 a lot. Why not lower?

Or the names of many different electronics, as well as their components. I've often wondered. For instance, FiiO Q1 Mark II looks pretty good, but why is it called Mark II instead of Q2? The PCM5102A DAC is common, but if it's a revision of the first one, why didn't they call it the PCM5102B?*...

Hi, I'm new here... I was wondering if anyone had done measurements of cheap PCM2704 DACs? Here is one I got today in the mail from China...