Acoustic Zen Crescendo speaker crossover capacitors ... who makes them?

These speakers are very respectable But,the Xovers are very lacking especially for 
Speakers including the Adagio the Xovers made in Taiwan ,I helped a friend  on the flagship and I  owned the Adagio the Audyn true Copper and Mundorf supreme caps are 3x in size as well in weight far better quality .for a few hundred dollars 
A dramatic upgrade across the board . My uncle is a pro audio engineer and knows the Chinese pricing model well being there several months a year.the cabinets at most 500 each and 250 on the Adagio a substantial  profit margin for even the drivers are made in Taiwan which 
Like tang band very good, but far less expensive then scan speak , seas,or Dynaudio. I am just stating  facts .I feel if  being charged  $5k and up I should get at least decent quality boutique Xover parts .Even Clarity ESA capacitors, and Mills resistors are a substantial upgrade in sonics at a minimal cost and still leave a very good profit margin .this is a pretty accurate statement. At least offer premium upgraded Xovers for just the price of the parts ,I think that would be fair.
When just being built easy to install .I had to take everything apart to modify to mount the bigger parts a lot of extra  work after they are built.

In all honesty the whole Xover only passes small voltage through a Loudspeaker 
Everything is converted through the amplifier before the Loudspeaker. 
Myself learning well over 20 years ago Electrolytic are by far the worst possible 
Way to conduct a signal the only reason used in power supplies normally for is you needed say 10,000uf in capacitance, poly caps are night and day less distortion and noise but are  Huge vs same UF- Microfared in capacitance. 
In a Loudspeaker largest are in bass caps say 80uf for example.Bass nowhere as critical to the ear such as midrange a decent cap like Clarity ESA, or top shelf for Bass Which I use a Munforf Supreme  if in your budget.Duelund way too expensivefor Bass., but for midrange 
On a good speaker yes. In a speaker Never would consider leaving electrolytic 
All ways a poly cap. Go to magico, yg acoustic,marten, b&w only poly caps 
Electrolytic in power supply like my amp over 200k in capacitance,I then  bypass with good Audyn .1uf Caps 
Poly caps just to clean up the. high frequency noise.This is very common practice.
I just follow what the leading builders do. That being said you do whatever with your monies.

Regarding thd Crescendo I heard on several visits stock as well as modded.
That is how I was aware of the caps in there .IMO they have no business at all in a over $10k Loudspeaker. At least name brand boutique caps like a Clarity ESA 
At the least .

The caps are Taiwan or were .I have Never known them to use name brand 
On the few Adagio and crescendo over the last 5 years. They still sound very respectable with a Xover upgrade with boutique caps. 
In thd Bass just put in a bunch of poly bypass caps Solen would ge good enough. 01uf 400v would be fine that would  clean it up a bit. Good Copper gold or rhodium loudspeaker terminals another easy fix.  
If you are open to spend around  $700 while you are replacing the Loudspeaker terminals VH audio has a special. 2 years ago these were $ 1300.
Bybee Golden goddesses on the hot side and then  black ones  on the minus. 
I guarantee you a more detailed quieter backgrounds and just more real soundING. I did these for a friend, I am more surprised at the results and I Allways do upgrade mods. First read a few reviews these were $4k when they first came out. They replaced the 24k hold with a matrix of things. Your call.