I'm talkin' 'bout the typical ferrites as used on billions of power and signal cables.
The affect/effect is non zero.
Dan.
IME ferrites on power and/or signal of radio/cd player, shelf system, hifi, PA system, take your pick, affect/effect audio, and not for the better.
Dan.
Quote " . . . The difference between ferrite beads and BQPs though is reality, on is based on reality on is based on BS..... "
So the BS stands for 'Bybee Science' I presume?
So the BS stands for 'Bybee Science' I presume?
😕
In what way and how did you arrive at this?
"That return energy is not linear and I find that such ferrites do affect/effect baseband audio."
At audio frequencies the effect is negligible (i.e. probably not measurable on an AP or on frequency response.
Its double blind test time.
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Can you explain why your experience differs so much, compared to quite a few reputable manufacturers ?
Dan,
I am convinced you are hearing things that are not there as in, cannot be discerned by ear. This is not the first time I noticed your doing so. And this is not the first time I am calling for some kind of proof. In order to make statements like this stand, you need at least to elaborate the kind of testing you did to come to such conclusions.
Metals come in all sorts of alloys... same with ferrites and metal-ceramic types. The alloying determines the freq of effective Z and q and other parameters....
such as, hysteresis which has similar affect as DA in a cap.
The German cores made of Aronit (cer-met) material and also Ferrite core HP3616 could be a good choice to try.
THx-RNMarsh
such as, hysteresis which has similar affect as DA in a cap.
The German cores made of Aronit (cer-met) material and also Ferrite core HP3616 could be a good choice to try.
THx-RNMarsh
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What got me to look at the higher than audio freq was a high THD+N reading with an 80KHz BW analyzer filter.... well within most SS amps BW. IIRC, -60-65dB re 0dbm when measuring a 10KHz signal via playback.
All looks good with THD or FFT esp with 30KHz filtering...... but unwanted freq above 30KHz are easily amplified by the pre and power amps to their BW limit. This can easily lead to increased distortion in the audio freq range.
As an alternative idea to filtering, low amplifer distortion measured to 100KHz might help. Is this a contributing reason why CFA sound better in most systems?
THx-RNMarsh
All looks good with THD or FFT esp with 30KHz filtering...... but unwanted freq above 30KHz are easily amplified by the pre and power amps to their BW limit. This can easily lead to increased distortion in the audio freq range.
As an alternative idea to filtering, low amplifer distortion measured to 100KHz might help. Is this a contributing reason why CFA sound better in most systems?
THx-RNMarsh
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Yes, IMD on wideband amplifiers is a reason it's sensible to bandwidth limit the input/outputs of an amplifier.
Integrating over 2.666x the bandwidth will also, unsurprisingly, increase the noise figure handsomely, especially depending on the compensation scheme of the amplifier (HF noise gain around the intercept for stability). Will any of it be audible?
As Bonsai writes, back to the DBT before handwringing.
And a preemptive happy Thanksgiving to our US members, and equal goodwill to everyone around the globe.
Integrating over 2.666x the bandwidth will also, unsurprisingly, increase the noise figure handsomely, especially depending on the compensation scheme of the amplifier (HF noise gain around the intercept for stability). Will any of it be audible?
As Bonsai writes, back to the DBT before handwringing.
And a preemptive happy Thanksgiving to our US members, and equal goodwill to everyone around the globe.
Noise shaping? DSD? (both have HF noise that confuses measurements) Or some historical amplifiers? Otherwise I have no explanation.
Note that i am Not talking about noise figure or thermal or 1/f or anything remotely like any of that. This increase is due to extraneous unwanted freqs generated by (digital) circuitry and which appears in the analog output.
THx-RNMarsh
"Unwanted freqs generated by digital" are easily measurable. If the device is not a total s..t, then it is noise shaping. I hope we do not speak about cheap DVD players with poor SMPS power supplies. But even if yes, a good amplifier must handle this easily. If not, then it is a poor design, regardless names.
second graph seems to be levelling out. As for the others, if you have 50W at 50KHz coming out your power amp then you have some major issues on your hands surely?
Ok. So it seems that the digital guys just moved their problem off their desk and onto the next guys.
The freqs above 20Khz must be cleaned up before going to the pre/PA. Either in the DAC/CD player or the next piece of equipment has to deal with it.
High levels above 20Khz can cause problems for the gear following.
View attachment SDModulation.pdf
tests which pretend that only our hearing freq range is needed to measure is deceptive. Critical listeners will hear the whole system working together which includes above audio freqs affects as well as dynamically changing parameters and elements.... neither are showing anything with typical FFT and thd measurements using a pure single, in-band sine wave for individual equipment tested in isolation.
I think I said this before.
THx-RNMarsh
The freqs above 20Khz must be cleaned up before going to the pre/PA. Either in the DAC/CD player or the next piece of equipment has to deal with it.
High levels above 20Khz can cause problems for the gear following.
View attachment SDModulation.pdf
tests which pretend that only our hearing freq range is needed to measure is deceptive. Critical listeners will hear the whole system working together which includes above audio freqs affects as well as dynamically changing parameters and elements.... neither are showing anything with typical FFT and thd measurements using a pure single, in-band sine wave for individual equipment tested in isolation.
I think I said this before.
THx-RNMarsh
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For some DIY'ers who might need some filtering, this can be a helpful source to add a LPF to their gear.
http://sim.okawa-denshi.jp/en/CRlowkeisan.htm
THx-RNMarsh
http://sim.okawa-denshi.jp/en/CRlowkeisan.htm
THx-RNMarsh
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What's the problem with having 50W at 50 kHz, Bill? Or am I missing something? I assume you have no significant breakthrough of whatever much isn't supposed to be there, although I have witnessed cases of ultrasonic noise leaking out of a cheap CD player, and that could be quite a problem. It was later found that a low pass filter inside was in fact not working due to a leaked out capacitor, and set straight by replacement, removing the worst of the problem.
No such problems with the real time DAC (8 parallel Philips 1543 DACs, no oversampling, no usual brick wall filters, just some classic analog first order filters), although I can hardly claim much on basis of just one (Australian) sample, delivering truly high quality sound. Worth every penny it cost (AU$ 250) and then some.
Seems like a paradox to me. Here we are, trying to avoid every bit of phase shift we can inside the amp, which means it must have a very wide bandwidth, and on the other hand this very act appears to be a possible trap which creates more problems than it resolves.
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