John,
Here in the Chicago area, $428 per pair would be a good price for a brand new pair from any of the JBL distributors. Based on a prior posted tip from you on the Klipsch site, I investigated the 2404H along with the EV ST350A, and elected to go with the JBL unit. I purchased a single used unit this summer for $170 (included an exorbitant $20 freight) from Jammin Jersey out of California. A pair would have thus run $320.
In addition to DJK, I suggest you write to Tom Brennan here in the Chicago area, as I recall that he has some experience with the EV unit.
Phil
P.S. I attempted to send you this via Email, but the Email was returned as unaccepted . . . any reason?