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B&W CM10 Mystery Cap?

I own a great pair of B&W CM10s, low to high seems to be how B&W prioritized parts quality across LF to HF crossovers. LF begins with an average electrolytic, then into the HF which also covers off the mids - they step it up to a mystery film cap, on to beautiful Mundorf SilverGold Oils for the tweeter.

I suppose on some level this is the way to do it, if one were a manufacturer, but leaves me thinking there is improvement to be made and mids are my target. I was thinking of placing a 0.1uF bypass cap on the yellow mystery cap as a safe bet for a boost and thinking Mundorf Supreme SilverGold.

Here is a pic of the mystery cap in question - what do you think of this plan? Good? Or scrap it and just replace the cap with something expensive and be done with it ?

 

 

 

rickysnit
rickysnit OP
79 posts
 

Bypass

erik_squires
15,902 posts
 

Audyn TruCopper is a fantastic bypass cap at 0.1uF. :) 

rickysnit OP
79 posts
 

That’s great Erik, appreciate that! I’ll have a look.

BTW, I thought further about your comment on my JBL thread - electrolytic replacement with film and ESR. What have you done to typically mitigate that? In LF applications dial down the capacitance slightly?

 

Thanks!!

Post removed 
erik_squires
15,902 posts
 

@rickysnit As I tried to write, you compensate with another resistor.

That is, if your cap’s ESR goes from 0.4 to 0.2 Ohms, you must add the missing value with a new R so the

new ESR + R = original ESR

I like to use Mills here because the high wattage are tiny compared to other brands, and extremely precise values. Get at least a 5W resistor.  If there is already a resistor in series you may chose to replace it instead with a larger R.  Say your original values were:

0.4 ESR + 0.2 R = 0.6

but now you have

0.2 ESR + 0.2 R = 0.4

You could either add another 0.2 R or replace the original with 0.4 R so the total remains 0.6.

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