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In Reply to: RE: Do you believe in giant killers? posted by ahendler on August 06, 2016 at 08:46:32
Unless it's been equalized back to flat in the analog domain your NOS DAC almost certainly has an treble roll-off. The roll-off is due to the sample-and-hold operation (known in DSP science as a 'zero-order-hold') of nearly all audio D/A units. With CD sample rate content the roll-off profile produces about an response that's about -3dB at 20kHz.
An 3dB @ 20kHz droop might not be audible in itself. However, the problem is that the roll-off begins two whole octaves below 20kHz, at around 5kHz. My experience is that the roll-off subjectively manifests as a sin of omission rather than comission, and therefore tends to sound benign. It's when you hear the same NOS DAC with the roll-off EQ'd that you realize what you were missing.
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Ken Newton
Follow Ups:
Two points
1) I do not believe that measurements tell you how a component will sound
Many people love tubes even though they don't measure well. People love vinyl although measurements would not support it. A lot of people favor nos ladder dacs although they measure worse than Delta/sigma dacs
2)How do you know that the designer of NOS ladder dacs don't adjust the analog output section of there dacs to give flat resonce
Alan
1) I never claimed that measurements reliably define subjective sound. You're trying to construct a strawman by suggesting that I did.
2) As I clearly stated before, the roll-off can be EQ'd back to flat. Published frequency response graphs I've seen have shown the large majority of NOS DACs do not employ such EQ.
3) You are unjustifiably defensive. I never attacked NOS. I fairly stated some of it's pros and cons.
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Ken Newton
I apologize if I misinterpreted what you were saying.
Alan
No worries :)
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Ken Newton
I looked up the specs on my Audio-GD Master7 dac that uses 8 1704 ladder chips set for no oversampling
SN > 120db
Freq responce 20-20khz < -0.1d
Alan
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