Pat, As one of the only other known eternal crossover Rev owners, be patient. The external crossovers take a good 600 hrs to break in, maybe longer (assuming Ultimate Mundorfs).
Pat ordered the standard crossover pieces and parts, but had them housed in external enclosures for ease of upgrading.
IMHO, the standard crossover is so good that he may not think there's much to be gained with upgrading. Though a direct A/B comparison is out of the question, perhaps you'd like to offer your perception of the differences, Ted. I wouldn't mind knowing how you think they differ myself.
Enjoy. They are world-class transducers of the first order. 
Absolutely correct IMHO. The seamlessness of the crossover/driver integration, the openness and clarity of the presentation and the realism afforded the listener is unparalleled in my experience.
And, of course, the bass is absolutely to die for.
