Passlabs D1 (PCM63) vs. Threshold DAC-2 (Ultra Analog D20400a) - who have heard both?

My high frequency hearing has gotten so bad I probably won’t hear it even if it were there.
Free low pass filtering with no phase shifts :)

Its sobering to see how early (40 years young) and how low (6kHz) higher frequency hearing is lost:
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Free low pass filtering with no phase shifts :)

Its sobering to see how early (40 years young) and how low (6kHz) higher frequency hearing is lost:
View attachment 1091014
even if this curves are without Flecher loudness corection they seems way off what I have measured over diferent individuals trought years its normal for 40year old man hear 6khz -5db , 10khz -17db (referenced to 1khz). however noth much can be heard after 15khz ,unless 15-17khz @100db level.