Soekris Dam Dac

[nige2000]

ac on a cell
Cant see how

ive used cells in all sorts of ways during testing breaking lots of ee 101 rules mostly with lenghts of wire and lack of bypass caps ort regular caps and still get great results regular
I wouldnt dream of doing it with linear supplies
Batteries are a Marvel

[jkeny]

Very interesting and thanks, John.

I read this thread where Jocko Homo contributed - http://www.diyhifi.org/forums/viewtopic.php?f=2&t=1681 (and don't recommend wasting your time on it as 90% is just mud slinging - aren't we fortunate to have Tir NA manners).

I think we shoud advertsie TnaHF forum as the highest SNR audio forum on the net :) and it wouldn't be marketing bullshit, it's true - very little to zero mud slinging goes on here.

There were no suggestions as to how to improve 1/f really.

Have you been working on that objective and can share any tips to follow?

Thank
Jonathan

Well, that thread is talking about the importance of low 1/f noise in regulators, particularly for digital circuits. Jocko does consultancy & measures clocks down to 0.1Hz & he claims that the one's with the lower noise in this frequency area are audibly better. I have some of these clocks that I have to try. But there's 2 aspects to this - the actual oscillator 1/f is determined by the quartz crystal at the centre of the device & the surrounding circuitry (all within the oscillator's metal case) - the second 1/f aspect is the 1/f noise in the power supply to the clock.

There's also a few posts on DIYAudio about very low frequency (VLF) noise but I can't find them at the moment.

I believe LiFePO4 batteries are the perfect solution here. In all cases introducing a buffer capacitor or a regulator in the battery PS is detrimental to the sound. I'm of the opinion that this is because the 1/f characteristics of the caps & regs are noisier than the battery's 1/f noise.

There's no tips I can share except that these batteries are, IMO, the best for VLF noise (i.e noise stability) but I've no measurements for this as such VLF measurements are extremely difficult to make as they are a function of the circuit handling the dynamic music signal

[jkeny]

I would think, for all intents and purposes, in this conceptual game that a constantly charged A123 26650 would have "infinite" .capacitance and the smaller one would have a fraction in proportion to its capacity of infinite capacitance.

Has anyone measured the amount of AC across a float charged battery? That would tell us pretty quickly how effective the battery is as a filter capacitor. I know I never have.

Below my multimeter reading which goes to 3 decimal digits on AC voltages

[rickmcinnis]

Which is why "conceptual game" was in the preface.

It was a joke. Kind of like when I said my imagination has been known to make things up ...

[jrling]

I'm off to listen to some Conceptual Music - Dark Side of the Moon.

[rickmcinnis]

Oh, please, anything but that.

When the INNER PARTY sends me to ROOM 101 that is what my punishment will be, listening to that record but this time the footsteps will be looped for twenty four hours and there is still another fifteen minutes to go.

[rickmcinnis]

ac on a cell
Cant see how

ive used cells in all sorts of ways during testing breaking lots of ee 101 rules mostly with lenghts of wire and lack of bypass caps ort regular caps and still get great results regular
I wouldnt dream of doing it with linear supplies
Batteries are a Marvel

which is why I figure for all intents and purposes the battery is acting as a capacitor of infinite capacity - a no pass filter - assuming neither you nor jkeny (with his invisible meter) are able to measure any ac across the battery.

One can always see AC across a PS filter cap.

These batteries are a marvel and marvelous is the sound.

[jkeny]

I found one of the posts on DIYAudio:
Max Headroom http://www.diyaudio.com/forums/analog-l ... ost3689373

1/f Noise Is The Devil....
Reducing very low frequency system noise (<< 20 Hz) by only a couple or few dB reduces a layer of intermod that intrudes over everything in the band of interest (20-20k).

This effective system intermod behaviour of 1/f noise is also spectrally important..ie the nature of the VLF noise imparts a signature/character to the noise/distortion floor.

IME this is a big arbiter of perceived noise/distortion floor, and further affects/effects all standard descriptions of sound quality...ie overall clarity of sound, L/R separation, depth perception etc.....focus, rhythm, timing etc.
When very low frequency noise reduction is applied to both channels coherently, the perceived noise drops further, thus enabling further improved focus, low level detail, and depth information retrieval.

System intermod behaviour also increases/enables/causes audibilty of low frequency noises, so any reduction/change in VLF system noise would serve to reduce/change 'groove' noise.

I expect the Bybee devices are changing VLF noise level/behaviour/spectrum.....not by a lot, but enough to cause an audible difference.

Dan.

[nige2000]

I found one of the posts on DIYAudio:
Max Headroom http://www.diyaudio.com/forums/analog-l ... ost3689373

This effective system intermod behaviour of 1/f noise is also spectrally important..ie the nature of the VLF noise imparts a signature/character to the noise/distortion floor.

IME this is a big arbiter of perceived noise/distortion floor, and further affects/effects all standard descriptions of sound quality...ie overall clarity of sound, L/R separation, depth perception etc.....focus, rhythm, timing etc.
When very low frequency noise reduction is applied to both channels coherently, the perceived noise drops further, thus enabling further improved focus, low level detail, and depth information retrieval.

System intermod behaviour also increases/enables/causes audibility of low frequency noises, so any reduction/change in VLF system noise would serve to reduce/change 'groove' noise.

I expect the Bybee devices are changing VLF noise level/behaviour/spectrum.....not by a lot, but enough to cause an audible difference.

Dan.

sounds like the description of every power supply improvement




i tested a small bybee in series with the speakers overall id call it a good improvement but also felt it did something marginally negative

[jkeny]

You bought some bybees?
Have you taken them apart yet? :)