Quote Originally Posted by grumpy View Post
The JBL p/n (61098) for those little blue caps are polypropylene.
No one would use ceramic caps for bypassing larger values in a crossover.

Definitely replace the L-pads if you have them in-hand.

If you're hell bent on replacing the caps, you could both get higher quality
capacitors (obviating the need for the bypass caps at all), and double up
on the values of the yellow ones and get two of each: to replace each single
cap with a pair in series. Then introduce a dc bias voltage (9v battery works)
through a several-Mohm resistor to the point between the caps. Google
"charge coupled crossover" or "dc-biased crossover".
I have often wondered about DC biasing. But since I have never done any of this sort of work before I would need some serious input from you all. Does the DC biasing just 'precharge' the caps? How could I do this and still be able to change the battery easily? Where does the battery need to go in the circuit?

As for doubling up do you mean instead of one 10uf 250v get two 10uf 250v and wire those in series to replace the original single 10uf? Then I would assume pull the bypass cap and simply bridging that gap with wire? I am totally willing to spend $30-$40 a cap. Please share your approach.

Thanks for your interest and time!