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Old 17th August 2011, 04:34 PM   #15071
SY is offline SY  United States
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Quote:
Originally Posted by VladimirK View Post
VERY strong effect of a cap in the signal chain is so obvious and so familiar even for beginners, that I do not see what do you mean.
Care to share test setup and results from a ears-only listening test?
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Old 17th August 2011, 04:50 PM   #15072
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Care to share test setup and results from a ears-only listening test?
Just change the cap (input, NFB, output) and listen the difference. The difference is so huge, that I see no need in more sophisticated test setups. Compare a lytic alone, and film polyprop alone. Any unexperienced listener states a big difference in sound. And this is so, irrelevant of what harmonics measurements show. Usually the last say nothing interesting, since important effects are masked by unimportant harmonics.
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Old 17th August 2011, 04:52 PM   #15073
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OK, so the answer is, no, you haven't actually done a listening test.
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Old 17th August 2011, 04:59 PM   #15074
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OK, so the answer is, no, you haven't actually done a listening test.
You mean some method. But if, as a final result, it states that all caps sounds similar, all the pages, containing its description, better to be used in a way, other than reading them.
If we can not see bacteria via simple glass, it does not mean that bacteria does not exist. Invent a microscope, and it will be found. But no, somebody will insist, that simple glass is THE INTENDED USE approach, and microscope is forbidden. Hence, bacteria does not exist, in spite that people get ill and find it related to bacteria.

Last edited by VladimirK; 17th August 2011 at 05:06 PM.
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Old 17th August 2011, 05:04 PM   #15075
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I don't understand your analogy. Either specific caps used in a certain position distort or they don't. Either specific caps used in a certain position sound different or they don't. You don't use a microscope for listening, just your ears.
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Old 17th August 2011, 05:06 PM   #15076
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Originally Posted by SY View Post
Care to give a two or three line summary?
Sure.

I was testing if a difference could be heard by changing the input cap of a Tripath amp. The Tripath needs a DC blocking cap because the inputs have a 2.5V bias. All caps were 2.2uF if possible, or 2uF if not.

I tested a least a dozen from boutique to ordinary, electrolytic to film to film in oil. Some sounded very different, some not much. My favorite were the Obbligato oil for mids, Obbligato film overall and Jantzen crosscap because it was very similar to the Obbligatos but much smaller. Some of the film caps weren't so great.

This was a specific test in a specific application. I kept notes. I picked what I liked on music. Testing was done over headphones.
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Old 17th August 2011, 05:12 PM   #15077
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Some sounded very different ... .
If you would ask BV to test just the differently sounding caps, and he would not report measurable difference, what would be your conclusion ?
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Old 17th August 2011, 05:19 PM   #15078
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VERY strong effect of a cap in the signal chain is so obvious and so familiar even for beginners, that I do not see what do you mean.
If you do diferential test (substraction) with two caps , with music signal with all transients and asymetry in signal, and audible results for your ears is ..nothing,silent, zero, and you at same time claim, you clear hear (with the same ears), diference between the those two caps, conected e. g as input capacitor in the same amp, what do you mean about it? Here is not black magic, or yes?

Last edited by BV; 17th August 2011 at 05:22 PM.
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Old 17th August 2011, 05:25 PM   #15079
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Can You post here simplified circuit, how was this cap conected?
BTW, tripath is PWM amp, and You are talking about DC blocking, so no coupling cap in signal chain. And in Tripath amps, input coupling capacitor is part of HPF with corner freq. about 10Hz and more, so here is AC voltage across this cap, and so distortions too, depending cap type.

Last edited by BV; 17th August 2011 at 05:32 PM.
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Old 17th August 2011, 05:26 PM   #15080
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Pano, thanks- how did you control for other sensory input?
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