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RE: Thanks...

Charles, thanks very much for this. MQA claims an end-to-end (which I take to mean encompassing the ADC and the DAC) "impulse response" with a main lobe of duration ~ 6 samples, with "ringing" limited to just one negative-going overshoot (ok, undershoot) "lobe" with no more than 10% of the total area (is that with linear or log scales? I don't remember). As far as I know they've released no evidence that they're actually achieving this (I asked for it once more than a year ago; go the typical audiophile "trust your ears" response, which I think I've heard elsewhere ;-) ), so feel free to comment on this aspect of things. But the main question:

When you say the QA/B-9 combo does NO damage at dual or quad (I assume that's 88/2/96 or 176.4/192?), what do you mean exactly? To adopt the MQA vocabulary, I would take to mean that an impulse equivalent to one sample wide (say, 5 microseconds at 192) would, after ADC/DAC, still have a width of 5 microseconds--is that what you're saying the QA/B chain can achieve? (I realize I so far haven't mentioned the question of the POSITION of the impulse in time--phase if you will--which could have uncertainty even if the width is preserved.)

I'm simply trying to understand what you mean when you say the QA/B chain does no damage, and how to relate that to MQA's claims.

I hope this line of inquiry makes sense.

Thanks much.


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  • RE: Thanks... - Jim Austin 18:21:14 05/28/17 (2)


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