What might a good to great 20uF film/foil capacitor for a woofer.

for caps you might try Clarity CSA 

for inductors you could try Solen , 1% tolerance 

Do not, do NOT change DCR on coils willy-nilly.  Lower is not better.

As for bypass caps, Axon is fine in the large values.  Be careful replacing old electrolytes though, especially here.  Match or compensate for any significant differences in ESR.  Again, and most importantly here, lower ESR is bad.

I am starting to use Jantzen Audio’s Litz Wire Wax coils, crossovers are 95% done, I just have to decide on the bass cap. I was looking at Jentzan’s Supremum Z 20uF but they’re expensive $$$ for a pair of them compared to the Erse 400v and other caps I have considered. I don’t want to pay for a boutique priced cap when I am looking only to improve the bass and waste money (losing/wasting) the med and top end frequencies? I have used Axon in a couple tube amps with great results but should i consider them for a bass woofer? I will look into the VH Audio ODAM, never heard about them before. I was looking at Clarity caps when I ordered the Jantzen Litz Wire Wax coils. I should have grabbed a pair to try out because I already paid for shipping. It wouldn’t have added any to the shipping cost being they don’t weigh too much. I appreciate all the info/ideas.

I’ve also been using some remarkable 1939 NOS unused before Western Electric No. 10 Tinsel wire/cable switching out all the (1976) Cornwall’s driver wiring shortly after installing and listening to the upgraded B-2 crossovers. That made a remarkable improvement in sound quality. Also, I'm now using 1930-40 Western Electric cloth over silk over enamel 18 ga. solid copper wiring for the crossover wiring as well. Very nice sounding wire.

Hello,Sir

We are ERSE factory and we have stock of Erse 20uf 400v Cap.

Any requirements pls let me know.

Kind regards,

Wendy