I'm not sure of the politics of posting this. Nonetheless, Nwavguy's "Op Amps: Myths & Facts" and "Op Amp Measurements" (google them) make for a good read and dispel the majority of leeperry's anecdotal pseudoscience.
So much nonsense on the same blog deserves an award(balanced headphones amping is snake oil, all opamps sound the same, all volume attenuators sound the same, and it goes on and on), this guy is good! He might even be (one of) the best I've read, so kudos to him! I hope he gets good money from his hard work coz he truly deserves it.
Lee Perry is always trying to prove op-amps sound different, and has NEVER shown any real evidence that they do. Every time he puts forth an argument, someone shreds it, much like what is going on here. I will give him points for being persistent though. And of course the 5532 always sounds bad to him, its what known as expectation bias, or experimenter's bias.. He believes they sound bad, so they sound bad.
http://en.wikipedia.org/wiki/Expectation_bias
Alright, another member of team "all opamps sound the same" I presume? I believe you own a shiny STX, but I guess you never bothered swapping its cheap opamps for better parts? So you're basically talking about gear you have never heard, it would be like a blind guy discussing on a forum about colorimetry.
without blind testing you can be biased by numerous non auditory factors
Nick, please do your homework and stop relying on biased measurements of feedback driven equipment that are utterly meaningless as previously explained. The diff between opamps is night and day when you compare say AD797 and LT1028, calling it "placebo" is nothing more than a proof of ignorance. This could be of some assistance: http://www.head-fi.org/t/397691/audio-gd-discrete-op-amps-reviewed-opa-earth-opa-moon-opa-sun-v-2
Have you heard the audiophile USB cables for your external DAC? [..]
From my perspective, this is the exact same argument.
Great! Thanks for passing by, this was a treat really.
5532 is meant to look good on the paper and smart manufacturers save large amounts of money by making ppl believe that they buy high end gear based on bogus measurements....when their music really goes through low-end jellybean IC's. The output stage is what colors the sound the most, so you'll only be as strong as your weakest link. At least some manufacturers such as Resonessence use AD797, which is one of the "less worse" opamps in many ppl's opinion(including mine)...I wonder why they didn't use 5532 and/or 4562 in their Invicta DAC
Luckily, the ppl who buy 5532'ish gear don't seem to have ever heard anything better so everybody wins: customer's happy and the manufacturer's too, obviously
I could bother going through google for hours and explain you how feedback is bad for ya, but this sounds like a waste of my time =/