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

Granny,

Yes I ave used this technique and it defiantly improves the SQ of a Bipolar Electrolytic Capacitor.   All capacitors in a Speaker Crossover should be Bipolar as this is an AC circuit.   If you google this there are many diagrams on how to connect the circuit, and you are describing it correctly,  you must however use a separate feed from the battery to each set of capacitors - luckily 1M Ohm resistors are very inexpensive.

One small correction to above post - since you are connecting the capacitors in series each should have a value of 2000uF, a series connection of capacitors results in half the value of each - i.e 2000uF in series with 2000uF = 1000uF

https://www.google.com/patents/US7443990

Best of luck

Peter  

Peter, I did figure that on the caps. Thank you for sharing this option.

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 .

Well my speaker does use two 1000uf caps per speaker so you are saying to bundle film caps and replace those electrolytics? The cost will be outrageous and I am not sure for bass frequencies it is worth it.  Just imaging buying 20 -100uf caps per speaker! Will they even fit! The cost is crazy high. 

@pbnaudio suggestion would cost very, very little and I have read that this battery biasing approach does indeed sound very good. As good as film caps on the bass Board? I don't really know.