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Old 24th July 2003, 05:51 PM   #1
eduard is offline eduard  Netherlands
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Default passive bi-amping parts

Hello, In the near future i need some small capacitors about 40 nanofahrad to make a 12 db 600 hertz filter at the input of my amps. There will be only little voltage. So what i need are c's that have good sonics and will keep their value during the next decades. I am afraid Audio Note will be not accurate enough or they must be willing to select them for me. Anyone has a suggestion what to use. For the lower part it will be in parallel and for the Tad 2001 it will be in series. Do i have to use identical types for both of them or not? thanks a lot, ed
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Old 24th July 2003, 05:59 PM   #2
SY is offline SY  United States
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The stacked polypropylenes from Wima (WKP or FKP) should work fine. Well constructed, stable, and good tolerances.
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Old 24th July 2003, 06:10 PM   #3
eduard is offline eduard  Netherlands
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Hello SY, Strange to say maybe but i was thinking of Wima as not audio grade. But i think i will try some because maybe the very small value and physical dimensions ( i will choose a 63 volt version ) will reduce the influence on the sonics. Maybe the kind of capacitors that are used in riaa stages will do. i WILL WAIT FOR SOME MORE IDEAS AND REMEMBER THEM ALL. THANKS SO FAR, Ed
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Old 24th July 2003, 06:25 PM   #4
SY is offline SY  United States
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A lot of expensive, well-regarded gear uses Wimas. I don't know about the sociology; maybe they're just too good, reasonably priced, and reliable to be fun or to be worth debating. I use them in my RIAA eq network and my active crossovers.
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Old 24th July 2003, 09:31 PM   #5
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Hi,

Quote:
The stacked polypropylenes from Wima (WKP or FKP) should work fine. Well constructed, stable, and good tolerances.
As do the ERO stacked polyprops...still I find them dated as far as their sound goes.

Maybe something to include into that cap/resistor shoot out, SY?

Maybe you should consider something a little more exotic...I mean it, there are much better caps out there without paying through the nose.

Edouard,

Ask Ger Fust from Fust Electronica to match the cap values you need.
If he isn't too keen, tell him I say hello...he will do it than...

Cheers and happy building,
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Old 24th July 2003, 09:35 PM   #6
SY is offline SY  United States
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No, for The Test, I want your best shot, the ones you think will sound most different from cooking-grade.

I've been having a fascinating discussion with some magicians on tamper-resistant box design. What clever measures/countermeasures there are!
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Old 24th July 2003, 09:49 PM   #7
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Hi,

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No, for The Test, I want your best shot, the ones you think will sound most different from cooking-grade.
To me they all sound different somehow, some more noticeably so than others.

There's a lot to be said in favour of the stacked films, which I don't consider to be cooking grade, BTW.
Could be the filmquality is not up to par, don't really know.

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I've been having a fascinating discussion with some magicians on tamper-resistant box design. What clever measures/countermeasures there are!
At the end of the day, those who cheat are only cheating on themselves...

Cheers,
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Old 24th July 2003, 09:50 PM   #8
SY is offline SY  United States
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In this case, they're cheating ME. It will still be possible, but not without some real effort.
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Old 24th July 2003, 10:37 PM   #9
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40 nano is not that easy to find in some more exotic brands. It's usually 33n or 47n, last time I checked.
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Old 24th July 2003, 10:39 PM   #10
SY is offline SY  United States
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33 plus 6.8 gets you pretty darn close.
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