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In Reply to: RE: Al Sekela on HDLs and the like... posted by Lew on April 15, 2015 at 11:57:45
"Since the capacitor is sonically invisible in this application"
I can' t follow you in that way: for an equal value the "quality" of the cap is clearly audible! I've tested a few and each time difference was huge.
Stein music use in its top level one use oil capacitor. For me the result is 50% value and 50% quality caps.
Follow Ups:
Aupiho,
A curious characteristic of the Stein Music Speaker Matches Plus is not simply that their noise reduction is striking and heard completely within a couple of days of installation but that the benefit then continues afterwards whether or not they remain installed. I checked this for a month or two after the $550 purchase and then delightedly sold the pair. The dealer of thirty years experience subsequently admitted to having exactly the same experience later himself.
DG
What you says is something I'm telling myself for zobel networks too ... Often for the firsts days after, a tweak change is huge but after a while when you remove it the difference become more thin...Even if a difference still there the gap between with and without is not so big than before...
What is interesting with a tweak like stein speaker match plus is that the improvement is really huge and that you can't go back without particulary if you have fullrange drivers like me!
My idea is that some tweaks acts like a burn-in improvement: just like if the tweak was giving the abit to you system to work with full potential and that in the same time the system is changing inside to respond to this full potential and better its potential itself... On a loudspeaker the idea is that the stein zobel helps the speaker to move in a way he didn't go before....a kind of second burn in wich helps the driver to have far better performance...
Just an idea...not a proof but...
Edits: 04/16/15
What speakers do you use? I tried to find out something about these on the internet, but all I could find was one blurb that mentioned the dreaded Quantum Effect. I think more likely they are RC networks, like the HDLs but perhaps using different values of R and C. If that's correct, then one would not expect the effect to linger after removing the device from the speakers. So, maybe I am not correct.Or, maybe they are true Zobel networks, designed to improve amplifier/speaker matching. That might be consistent with other claims I saw that they reduce or eliminate "back EMF".
Edits: 04/16/15
Of course it's impossible to argue against your subjective impression that the capacitor makes a "huge" difference, but it seems to me that the impedance of a .01uF capacitor (used in the Walker HDL and also recommended by Al) is very very high until you get into the RF range, which speaks to the intended purpose of the device. Therefore, essentially no signal voltage passes through the capacitor, which is why I say the cap is sonically "invisible". Indeed, on my home-made HDLs, I cannot hear any difference among different capacitors on my speakers.
However, I think I saw elsewhere that you use something like 0.2uF or 0.3uF. I suppose at that high-ish value of capacitance, the low pass frequency comes much closer to the upper limit of audio frequencies, so there might be some audible effect in the treble. I almost want to say that if you can "hear" the capacitor, it's value is by definition too high, if the goal is the same as that of the HDLs and similar devices. But whatever floats your boat is fine with me.
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