Capacitors in a filter application

Filburt · 11th May 2008, 10:53 AM

I'm thinking of changing around the capacitors in the LPF on an Assemblage DAC-2.6. It came, stock, with WIMA MKP2 caps (or whatever the 5mm ones are). I just recently tried Panasonic ECQ-P 630V, but those ended up being too laid back or something; there was a slight sense of veil that was off-putting.

I'm thinking of using the Multicap (Polystyrene) that Parts Connection originally offered as the upgrade since I'm curious about that. I've also seen people mention Vitamin Q PIO caps as good but I have zero experience with that stuff and it's difficult to find good information on how well those would work for this sort of application. I'm not looking to spend tons of money since eventually I'll be installing a (discrete) current steering i/v in place of the THS4031 I'm currently using (AD825 is as LPF/Buffer). However, I also think I should be realistic and realise that I may just not get time for it for a while, so I figure it may be worth getting good performance out of what I'm using right now.

So, any suggestions would be helpful. Cap values are 0.015uF, 0.022uF, and 3900pF (e.g. 0.0039uF).

AndrewT · 14th May 2008, 11:22 AM

Hi,
3n9F, 15nF and 22nF are all available in either polypropylene or polystyrene. PS will be bulky and expensive.
PP in commercial types can be bought in these sizes very cheaply.
Before spending large amounts of money on a few exotic caps, try buying a selection of cheap metallised film polypropylene from various manufacturers and to various voltage ratings and styles.
You may well find the solution is much cheaper than you expect.
Have a look at the caps thread for the classD amp. It has a lot of cheap ideas in there as well as some more expensive ones.

Filburt · 16th May 2008, 05:28 AM

Thanks for the help, Andrew.

I decided to bite the bullet a few days ago and just buy the RTX. They fit, barely. I had to sort of finagle it to get the 0.022uF in, but it does fit for the most part.

The performance is outstanding; I'm seriously impressed. Much better than the ECQ-P Panasonics and the WIMA MKP2s. I pretty much ended up with exactly what I was trying to achieve, so I'm quite happy

11th May 2008, 10:53 AM	#1
Filburt diyAudio Member Join Date: Jun 2006	Capacitors in a filter application I'm thinking of changing around the capacitors in the LPF on an Assemblage DAC-2.6. It came, stock, with WIMA MKP2 caps (or whatever the 5mm ones are). I just recently tried Panasonic ECQ-P 630V, but those ended up being too laid back or something; there was a slight sense of veil that was off-putting. I'm thinking of using the Multicap (Polystyrene) that Parts Connection originally offered as the upgrade since I'm curious about that. I've also seen people mention Vitamin Q PIO caps as good but I have zero experience with that stuff and it's difficult to find good information on how well those would work for this sort of application. I'm not looking to spend tons of money since eventually I'll be installing a (discrete) current steering i/v in place of the THS4031 I'm currently using (AD825 is as LPF/Buffer). However, I also think I should be realistic and realise that I may just not get time for it for a while, so I figure it may be worth getting good performance out of what I'm using right now. So, any suggestions would be helpful. Cap values are 0.015uF, 0.022uF, and 3900pF (e.g. 0.0039uF).

14th May 2008, 11:22 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, 3n9F, 15nF and 22nF are all available in either polypropylene or polystyrene. PS will be bulky and expensive. PP in commercial types can be bought in these sizes very cheaply. Before spending large amounts of money on a few exotic caps, try buying a selection of cheap metallised film polypropylene from various manufacturers and to various voltage ratings and styles. You may well find the solution is much cheaper than you expect. Have a look at the caps thread for the classD amp. It has a lot of cheap ideas in there as well as some more expensive ones. __________________ regards Andrew T.

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16th May 2008, 05:28 AM	#3
Filburt diyAudio Member Join Date: Jun 2006	Thanks for the help, Andrew. I decided to bite the bullet a few days ago and just buy the RTX. They fit, barely. I had to sort of finagle it to get the 0.022uF in, but it does fit for the most part. The performance is outstanding; I'm seriously impressed. Much better than the ECQ-P Panasonics and the WIMA MKP2s. I pretty much ended up with exactly what I was trying to achieve, so I'm quite happy

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