If schematics were posted somewhere in this thread, can you provide a link?
Search function doesn't seem to turn up anything with that word except your post above.
I'm trying to advance the discussion. Have you any thoughts/ideas regards my question?
I've asked what your question means - if you could explain it in another way, please?
Lots of possible reasons: Layout of LP filter effects on stray coupling or ground currents, particular components used having some direct effect on sound, possible filtering out of some vow level RF noise at the input that otherwise gets rectified in semiconductor junctions and affects bias levels, etc. Could also simply be the little bit of expected phase shift in the audio band that turns out to be audible. Some experimentation might be needed to figure it out.
Danial Kahneman used an acronym to describe a very common observation about human thinking: WYSIATI
wysiati rule - Google Search
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Is there a 100KHz LP filter on one of the preamps? Edit: Ah, you mean PMA suggested using a 100KHz LP filter to smooth the 1MHz preamp? Has this been done & the an audible change noted?
Sure, using a LP filter changes the BW - that's what an LP filter is - a BW changer & is in no doubt. But is anything above 20KHz audible i.e change the sound?
Hmm, what do you understand by transfer function? I understand it to mean the function that describes how the system maps from input to output signal. It's what comprises the output signal & differences between them which give rise to the audibility that I'm interested in. Simply saying one preamp produces a different output signal to another preamp doesn't really get us very far in understanding what are the audible differences.
OK, phase shift is implicated in a BW change LP filter so is this happening below 20KHz? I don't remember seeing any graphs which showed this - did I miss this evidence?
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I wonder if it isn't more likely that the difference in the phase response was audible through different, not very good, listening set ups, than the difference in the noise floors. Also the suggestion that a filter could for some people make poorer recordings sound smoother through an accurate system.
Yes, that's possible & a lot of people reported listening on their laptops, etc Maybe a bad systems interacting with & exaggerating phase differences?
A 100KHz filter? If it effects something <20KHz then yes, it's possible otherwise it is being suggested that changes > 20KHz are affecting audibility which is also possible if foldback is happening or is there another mechanism?
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I have had a question: if a HF transparent stage shows negative traits in sound, is this because (i) it precisely produces traits in its input (ii) it creates its own negative traits?
The answer is probably 'both'. But lately I'm convinced (by comparing with the source) that the negative traits are products of the transparent stage!
Now I want to find out how or why a transparent stage can produce such a negative trait. The perceived sound as one of the negative traits is the sharpener of the tones (chalk on the board) often associated with the sound of HF intermodulation.
PMA implied that the input filter 'degraded' sound quality. Just filtering HF garbage shouldn't affect the sound negatively. I think the problem is that we have ignored the effect of phase at both ends of the spectrum.
Don't feel too bad, at least you are not getting beat up by syn08 for saying so. Not so lucky here when in an AK4499 thread I said that the NJM7805 voltage regulator sounded better than a high performance LDO. Accusations to the effect that I must be up to some no good or some kind of fool were absolutely unwarranted.
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Claim accompanied with quote would help your credibility. Otherwise it's just a conjecture.
Nope, you were simply asked by myself and others to prove and explain your conclusion about the 7805 superior sound. Since these ancient regulators are known to have some poor performance (in particular noise and frequency response) you claim constitutes an extraordinary claim, as such requiring extraordinary proof. You came up with nothing of substance, as usual.
Lacking any evidence, you could present your design choices as your own preferences. That will save you lots of troubled interactions with those pesky EEs.
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The explanation is simple: I listened to the dac with the 7805 and with an LT1963. Also, in the past I listened to ADM7150 verses an opamp buffer voltage regulator (with a different dac). In addition, I am not the first person to hear the audible effects associated with at least some LDOs. The only technical conjecture we have about why it happens has to do with regulator linearity. That said, no attempts to measure the audible differences were conducted by me. From my perspective, I don't owe you my time spent on research to prove I am justified in saying one things sounds better than another thing. I am not saying noise is better or regulation is better, only that I like the sound better.
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I don't think it does. And that's a test too
...One and the same amp: Both with a capacitor of the same brand (WIMA?) and type (MKP2?) but different values (x10 difference) setting the BW / -3dB point at 100l/1M.
It's an other test than this one for sure.
From test in this thread we cant draw the conclusion that there is a difference due to BW.
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That’s not an explanation, that’s an opinion, and it should be taken as such.
This comment shows again that you are not looking for any technical progress, but only attempting to create a group of cult followers. Likely for commercial purposes, by yourself and your (self admitted) business partner Jam. There’s nothing new in attempting to promote, under DIY pretences, a fake “secret sauce” in audio, in a desperate attempt to differentiate from the pack.
True, that test could be a logical next stepI don't think it does. And that's a test too
One and the same amp: Both with a capacitor of the same brand (WIMA?) and type (MKP2?) but different values (x10 difference) setting the BW / -3dB point at 100l/1M.
It's an other test than this one for sure.
From test in this thread we cant draw the conclusion that there is a difference due to BW.
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