Just do what Gene mentioned to test. Mine are original and sorta wavy. No issues. One of my Emits should be replaced. It buzzes on piano. No problems on other music but I do listen to piano so....If they were redone like he said there should be no issues unless he likes to crank metal at high volumes with underpowered amps. Which I doubt.
Gene would be your source of info for those but oh yeah!!!! Personally I'd use the stock crossover but that's me. I'm having Bill Thalmann redo my RS-1 crossover or whatever it's actually called. I'll let you know how it sounds when I get it back. I'd love to have a pair of 4.5s but may just try to get some 2.5s due to my lack of space around here. Don't forget the pics.
On the EMIMs are they rebuilt with Graz ribbons?
Nickelback-No idea what the CD is got it from an ex of mine. Running thru the AR-90s but using the VTLs for power. Sounds alot better than I remember. Gotta love tube amps.