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Old 3rd October 2005, 06:23 PM   #1
VS is offline VS  Portugal
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Default Polypropylene versus metallized polypropylene

Hi !

Which capacitors, Polypropylene (KP) or metallized polypropylene (MKP) are the best for audio? (E.g. bypassing electrolytic caps. in a signal path)

Opinions needed

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Old 3rd October 2005, 08:22 PM   #2
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Polyprop is consistently better sounding than metalised polyprop IME. Neither is best in an absolute sense.
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Old 4th October 2005, 02:42 PM   #3
VS is offline VS  Portugal
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Thank you, but thecnicaly speaking.....what is the diference? Are the dissipation losses smaler? Is the dielectric absortion ?

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Old 15th April 2006, 12:17 AM   #4
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Does anyone have more to share on this!!

Im thinking of following kk design for the AX100 which calls for 2.2 MKP across the caps

Cheers in advance
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Old 15th April 2006, 01:57 AM   #5
infinia is offline infinia  United States
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Wima suggests these caps in their application guide
for High pulse rise time rating. High (surge) current carrying capacity.
look around there for more info
IMO in the past foil was superior for dv/dt but metalized has improved greatly.

MKP 10 (metalized polyp)
FKP 4 (foil polyp)
FKP 1 (foil ployp)
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like the whisper of the termites building castles in the dust
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Old 15th April 2006, 01:28 PM   #6
AndrewT is offline AndrewT  Scotland
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from reading, I think the advantages of metalised could be:- smaller package, less inductance, self repair.
And advantage of foil could be:- higher pulse current, higher dv/dt, ?

polypropylene and polystyrene are reputed to be audio suitable. Teflon might be but at the moment too expensive.

Wima's foil are not true foil, they incorporate metalised for self repair in the constructions they show on their website.

For bypassing, stick with ceramic for lowest inductance, but only with the very shortest of component leg lengths and close to the current client (glitch producer).

For decoupling, use polarised (electro/tantalum) of the biggest size that fit the board. Aim for a minimum of 20 times (preferably 1000 times) the total bypass on the board.
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Old 15th April 2006, 03:57 PM   #7
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Classic everything you wanted to know article.

1980: 'Picking Capacitors, Part 1/ Part 2', co-authored with Dick Marsh, was published in Audio, in February of 1980. This two part article examined a number of capacitor types for performance characteristics relevant within audio applications.

Probably still relevant today.
Two people can keep a secret if one of them is dead.
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Old 15th April 2006, 05:20 PM   #8
mzzj is offline mzzj  Finland
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Originally posted by VS
Thank you, but thecnicaly speaking.....what is the diference? Are the dissipation losses smaler? Is the dielectric absortion ?

Metal foils show usually lower distortion than metallized. Cyril Bateman was suspecting non-ohmic contacs along the metallization and end plates to be a cause of this. I recommend C. Batemans series of articles in Electronics World(Capacitor sound parts 1&2&3&4&5...) if you are more intrested on subject.
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Old 15th April 2006, 05:36 PM   #9
Vidalgo is offline Vidalgo  Israel
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Note that there is stacked version of the metallized film capacitors. Construction is similar to multilayer capacitor. No winding = no inductance = excellent pulse responce.
Epcos produce such caps - look for series B32620, B32621.
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