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In Reply to: You missed a few good criterion. posted by jihad on June 25, 2012 at 05:55:23:
"You want minimal crossover distortion in class B amps, class AB amps show worse crossover distortion which can be audible."
This usually shows up in the FFT at 1Khz as high order products.
"IME and IMO, there is no comparision between class A and class AB or B, Class A amps do sound superior"
Generally, I agree but there are some important exceptions.
"You also want a high PSRR overall as well as for each individual stage"
This you can also see in an FFT as the power supply harmonics will show up there and it also let's you see if there is IM distortion products between the signal harmonics and the power supply harmonics. Amps with almost no power supply noise also have very clean FFT spectra(at least with regard to the IM distortion).
"You want good open loop performance, meaning gain and frequency response. Feedback should be used as/if/when needed and should not be shunned, IMO."
Some of the amps I have heard that sounded really good had SOME feedback but I don't know of one that I heard that I really likeed that had a lot.
"I would chose lateral mosfets as output devices. In my limited desgin/building expereience they do sound superior to BJTs, all things not being equal."
I have heard both sound good so but I would say that BJTs are the least linear amplifying devices. However, you need to run them both as much Class A as possible (tubes too for that matter).
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Follow Ups
- RE: You missed a few good criterion. - morricab 07:54:41 06/25/12 (0)
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