Input capacitor 2.2uf Polystyrene or Mundorf Silver/oil? - Page 2 - diyAudio
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Old 14th November 2012, 06:41 AM   #11
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well .... i can tell that i noticed listenable difference between 2.2 ufd from wima mkp or mks next to a Chinese unknown manufacturer which the Chinese was better for sure the choice of the input capacitor will play some audible role ...

keep in mind that polarity of especially exotic and big caps will also have some effect in the sound due to the built of the capacitor...

eventhough these are called non polar caps still from the manufacturing there is polarity and this will play some role

capacitor will also play some role always depending on the rest of the filter

Kind regards
sakis
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Old 14th November 2012, 08:42 AM   #12
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Hi Sakis! As we are in the hi-end parts mood, have you ever seen or heard of 2.2uF Polystyrene caps? I reckon they must be a lot bigger than the preamp!
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Old 14th November 2012, 09:04 AM   #13
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Yes IAn ..they are big polarized and microphonic so its not only the benefit of good sound that passes through them ... there is other things also //

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Old 14th November 2012, 10:52 AM   #14
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i have compared with hand wound polypropelene with 1uf polystyrene....
polystyrene gave very very transparent presentation.... I guess mundorf would have softer presentation than much clear pres as styrenes...

I would like to remove the input cap this cap is just to block the DC.
there will be a preamp before this which is opa627

the reason why i want to use get that signature of that capacitor is very much perceived when used in signal path...
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Old 15th November 2012, 09:10 PM   #15
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I have mentioned the following in another thread, but the subject of caps comes up so often that I hope repetition to be forgiven.

Not to upset the apple cart - certainly not to grate those with golden ears .... but before we go all agog about the "sound" of caps "in the signal line" we might review a few electronic basics:

The signal path: I think most of us have learnt that current flows in a circle/circuit. I am therefore puzzled why mostly only those capacitors from say signal input to perhaps a transistor base is considered "in the signal path". Electricity cannot suddenly appear in a circuit, nor can it disappear into thin air. Every minute bit of signal going through an input capacitor thus also has to 'return' somewhere through a power supply or at least a bypass capacitor. But no one seems to be so very worried about the quality of those - surely the weakest link in the circuit determines the quality!

Then the action of a coupling capacitor: For signal frequencies coupling capacitors are supposed to be shorts, i.e. contribute a negligible atternuation/effect to the circuit. It is as if one has a 10 ohm resistor in series with a 10K resistor, and one spends one's attention only on the quality of the 10 ohm!

How can that be logical?

Last edited by Johan Potgieter; 15th November 2012 at 09:17 PM. Reason: spelling
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Old 15th November 2012, 10:31 PM   #16
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johan .. your approach is wrong to my opinion

first of all see for your shelf ...get a very basic amplifier and degrade all capacitors in the ''signal path " as described above with the lowest quality available ..then you will know ...

This theoretical approach might come out of a book but music is not just an AC signal there is way too much information travels through this capacitor and its a type of many signals mixed

So of course there is going to be both audible difference and orientation like X cap plays good with this music and some other better or worst ...

If you are only trying to listen 1KHZ signal ... most of them will sound pretty much the same

kind regards
sakis
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Old 15th November 2012, 10:52 PM   #17
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I must say I am at a total as why you want to flavor the music with caps . Johan approach as far as I understand it is on based in logic . My question is not to the audible difference in cap which I agree is there but to why do you want to use them as tone controls in a solid state amp ? If it is as tone controls then so be it . This not the road taken by many of us on the board .
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Old 16th November 2012, 12:23 AM   #18
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I just wonder of this:
Why doesn't anyone find theese presumeable big differences in sound-signature when such caps are testet in a double blindtest?
I am afraid there is all too much of a placeboeffect going around here.
As long as we have caps of reasonable good quality, there must be exstremely hard to find any real good arguments to prefer a $100,- cap over one cost $2,-

The paralel Johan points at is really a good one.
There is so much going on in an amp that reduces the audible effect of an input-cap to be as close to zero as anyone can imagine.

And as I said: Why can't anyone determine this in a double blindtest? Ever?
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Old 16th November 2012, 02:43 AM   #19
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yeah i agree with sakis we are not just measuring in freq domain... its alot more than that...
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Old 16th November 2012, 04:30 AM   #20
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Are all polystyrene caps good for audio?
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