Very nice set-up. I’m looking up the specs on both. Are you going for a “near field,” full field (?) set-up? The JBL’s have some very helpful looking set-up features. I think I’d bring up the JBL’s first , and then add the Yamaha MSP5 set to fill in or do what the JBL’s are not and vice versa – whatever that may be at even given time. I think once you get all the specs lined you, you’ll be able to calculate many things on all this and just work it out by ear and eye on the meters, even.
And I’m also wondering about placement? Will the JBLs be placed adjacent the Yamaha or maybe further back on a separate set of stands or wall mounted? You have some interesting geometry and acoustics problems to work out until the cable finally arrives.
Wonder if JBL has a forum? If so, I’d drop a post about this there.
It’s going to sound awesome.