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I'm thinking of replacing a MC33079 with a OPA4134 in a dac. Anyone with actual experience or electronic training out there that could shed light on the likelihood I could drop in the 4134 without a problem? The LME49740 works in this situation. I seem to prefer fet op amps and the OPA2134 in particular from my present experience. The OPA4132 is another possibility. Thanks, Tweaker
Edits: 06/07/16Follow Ups:
Personally I would stay with the LME49740. From the NwAvGuy website, where he compares many different opamps,
*OPA2134/OPA134 - The Burr Brown dual FET OPA2134, and the OPA134 single version, are the BMW 325 sedan of audiophile op amps. You see lots of them around, they're not exactly cheap, and they offer better than decent performance. I've included this part in my comparison mainly because it's so popular. They're $3 - $4 each for the dual part. Personally, for the price, I'd much rather have the LM4562 which outperforms it overall. I had to laugh when I read Doug Self's critique of this part. Commenting on Burr Brown's claims of "superior sound quality" Self said, "regrettably, but not surprisingly, no evidence is given to back up this assertion."
"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 ?
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? ;)
I'm not interested in using a bi polar part. I like the sound of the 2134 a lot and will soon listen to the 2132. Since both of these come in quads I would like to know if they would very likely work problem free as a replacement for the bi polar quad chip that is stock. Don't know if there are any complications with quads that would make oscillation more likely. Peoples opinions of sound are all over the place. My issue is the likelihood of problem free operation. Tweaker
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