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In Reply to: RE: Quad op amp drop in replacement ? posted by Hornlover on June 08, 2016 at 08:37:38
"TRANSPARENCY: If op amps really have a "sound", as many audiophiles suggest, it would follow when you add op amps to the signal path the sound should change. Two guys named Meyer and Moran conducted a very interesting rigorous study. They played high resolution SACDs on a high end system and sometimes inserted an extra A/D and and D/A into the signal path to "down convert" the high resolution audio to CD quality (16/44) audio. After 500+ trials lasting more than a year, using audiophiles, recording engineers, and students as listeners, they found nobody could tell when the extra A/D and D/A was in the signal path. On top of demonstrating the supposed benefits of SACD are highly questionable they also managed to demonstrate that A/D and D/A converters can be audibly transparent as well. And, as you may have guessed, both the A/D and D/A add several op amps to the signal path. But nobody could tell they were even there. There have been many more blind tests that also demonstrate different op amps (and much more) indeed sound so much alike even audiophiles can't hear the difference. See the Matrix audio test for another example."
Citing Meyer and Moron's "test setup" as a definitive source? Too funny!
Can you say gobs of negative feedback?
Follow Ups:
Seriously, is the author of that article deaf, or what? Indeed, a very funny read. The troubling part is that he's serious. Which brings me back to my question - is he deaf?
those who evaluate audio gear by watching sillyscopes rather than listening to music. Such is quite evident with this guy:
" It's very difficult to match the overall performance of even the inexpensive 5532 op amp with a discrete circuit...
To even come close to the performance of an IC op amp many more components are required. You need differential pairs, multiple stages, current mirrors, constant current sources, bias circuits, protection circuits, etc. You end up with dozens or even hundreds of components to try and match a single dual op amp IC in a little 8 pin package...
Op amps typically have higher open loop gain. This allows more feedback which in turn lowers distortion...
An op amp, because of all the advanced techniques available to IC designers, can operate its output stage in Class-B with vanishingly low levels of distortion."
One just has to shake their head and smile. That's what Nelson Pass would do. :)
You did see AV Guy in his name ........
ET
so, he's another clueless guy from the NW.
Did I miss your point?
No, I was just stressing the AV thing. They can be linked with pro sound guys in my experience. On one board a QSC engineer said all amps sound the same and parts quality on caps wouldnt change the sound.
ET
All op amps sound the same, all amps sound the same, all coupling caps sound the same. Ahh, Life is easy again. We must be hallucinatin. Between a OPA2134 and a NE5532 I'll take Moron's blind test any day of the week. Anyone want a piece of the action?
They can be linked with pro sound guys in my experience.
Got it!
On one board a QSC engineer said all amps sound the same and parts quality on caps wouldnt change the sound.
Why would that sentiment be a surprise to anyone? ;)
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