sajunky
Headphoneus Supremus
Yes. NOS mode I would chose for comparing, always. Bit-perfect transfers of audiophile quality music.Nope. I've auditioned my friend's May. It's closer to the sound from an Audio-gd DAC, especially in NOS mode. Absolutely NOTHING like a Benchmark DAC.
No. Springs 2 level 2 was fatiguing. There is a point where upper frequency become harsh, losing harmonic coherency with base notes. Transient details like reverbations on a decay disappear, image becomes blured, it turns to a one massive sound. It is not in a DAC, but in my brain no longer able fully reconstruct sound real-time. I became a very sensitive detector. Delta-Sigma DAC brings fatigue after 10-20 minutes, for Springs my brain switched to a simplified processing after one hour of listening at a medium volume. Other R2R DACs, Audio GD, even my entry level R2R-11 do not show such phenomenon, can listen for hours, all day.
For Holo May there were reports of hearing sea waves along music after couple of hours. Others report of developing pumping pressure or sort of dizziness. In my opinion this is a main reason of getting so many offers on a secondary market.
There was a discussion on technical aspects with other member on the NOS and sound preprocessing issue of May. It turned out I was wrong on the oversampling part, but from his measurements I came to a discovery that Holo Audio is adding spread spectrum ultrasonic scrambling to a sound. It leads to very good distortion figures and a measured ladder linearity, but these are averaged results over thousands (even hundred thousands) samples. Our ears react on each clock output value. Our sensors are not analogue, but digital. If it were analogue, we would perhaps need full analogue reconstruction of a waveform. We don't. NOS mode allows us to read digital samples in the original form (before analogue reconstruction), simplifying data conversion path, the actual DA conversion is made in our brain (If there is a conversion). From the Holo Audio example it looks like ultrasonic scrambling do not help our reconstruction process. It gives a pleasant effect in the short term, it doesn't lasts for long.
[EDIT] I didn't mean Benchmark DAC. Holo Audio DAC is a benchmark for measurements, that is. Others already picked up this nuance.
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