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In Reply to: RE: Digital improving -final posted by J. Phelan on April 16, 2016 at 17:39:05
"Alright - so before 2010, most DACs were programmed wrong -to pre-ring. But how audible is this ? Is there proof ?"Right or wrong really doesn't apply.... It's a matter of personal preference.
Linear phase measures better, especially "phase error".... But I think minimum phase is truer to the original pre-digitized audio waveform..... There are fans and detractors of both. All things equal, I prefer minimum phase.... (I think minimal pre-ringing sounds more pleasant than no pre-ringing, but there should be more post-ringing, relatively speaking.)
"I believe there's bit-switching noise, but I thought digital measured very good. Has anyone measured the RF ?"
There should have been a log with such data put forth back since day one of digital audio playback..... I think it would impact people's decisions on what products to attain.... All I know is that putting an AM radio near an active DAC, the radio station is often drowned out by the noise from the switching in the DAC. (This is why I never liked PCs for digital audio playback. They're RFI monsters relative to dedicated DACs.)
Edits: 04/16/16Follow Ups:
"..drowned by the noise". But it could be the power supply, no ?
"But it could be the power supply, no ?"
Only if it's a switching power supply.... Some of those things are nasty...... But most good DACs don't use them.
Most audio gear still use linear supplies..... Poorly designed linear supplies will make an AM radio emit 60/120 Hz "buzz" out the speaker..... But not enough to drown out a station.
Could be the clock - how do we know it's the switching ?
Scanning around, I found an old Analog Devices spec-sheet (for a 20-bit DAC) which claimed noise of -120db. But only if you employ the extra (recommended) capacitors. In reality, it was probably -115db. Still low, but some are now claiming -140db, in a complete D/A device.I then found a research paper by TI that talked about clock-noise. But the report also mentioned 'intrinsic' DAC-noise. So, you're right -the question is how much...
Edits: 04/17/16
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