Thank you so so much for your feed back (as well as the others that provided info). I was tied up for the past 6 weeks but now ready to move forward. I was deciphering your parts list for the ClarityCaps and was confused in a few areas but think I have it right.
1) I assume the list of parts is for one complete crossover upgrade (one AR Speaker cabinet). Therefore I would double up on the parts to complete 2 AR90 speaker cabinets.
2) In each line item you mix the words "series" and "parallel" in the same sentence, which confuses me. example: 24mF (series) ClarityCap CSA (2) 12.0mF 250VDC connected in parallel. To me, I would think I need to just wire two 12mF together in parallel to make 24mF. So whats the "series' for?
Finally, please review the parts list I assembled in PartsConnexion shopping cart (the 4.7mF and 2mF caps are out of stock right now and listed as $0, but I would order them when it comes in stock or elsewhere) and let me know if this is complete for 2 AR90 cabinets.