However, the 1x12 open back widebody Mesa cab along with the Mark V combo each with the OTR speaker is just kick ***. I got used to the speaker while using the 12AT7 in V4, and on for a short term in V6, now all preamp tubes are 12AX7 and the Mark V never sounded better. This speaker actually kept the Mark V off of the "for sale, used amp" list. I am loving the V more and more every day such that it is getting more use than the JP-2C. For me this was the best mod I have ever done and perhaps removal of C39 was a help. You can really drive these speakers hard and push the bass up a bit more than you could with the V30 or MC90. The single 1x12 cab will work with the JP-2C but the Mark V is a definite yes and would recommend this speaker for specific use in a Mark V combo or extension cab. It will sound a bit dull from the start out of the box but does not take long to loosen things up. The highs will bleed out eventually as well as midrange swell near the end of the break in period. Thanks for the suggestion Jnoel64!
Forget the EV, I may eventually get 4 more and rebuild my OS Recto cab. Will have to hear the Roadster though the OTR first before I decide on it.