I have a Peavey 50/50 and use it with a Studio Pre - it sounds great. Very tight. 2 spaces for the Peavey. You can fit it and your JMP-1 in a 4 space rack. Pretty easy to carry unless you bruise easily. You could also get a Mesa Fifty/Fifty and a Hot Plate to take care of the side of the power amp you aren't using.
Good luck finding the right fit.
Good luck finding the right fit.
