He looks just like you, Tel!
Look forward to hearing the results at a gig. These cabs are very clear on stage and you can hear them from wherever you are in the room, dispersion is excellent. You can in fact load them with low end, but they are quite mid-forward as said above - however this means you will be heard live regardless. The best amp I used with them was a Burman 100W all-valve set-up, that was wicked.
I used ONE J12 in a 9-piece Stax/Mowtown function band with three-piece horn section, three singers, drums and guitar and it was more than adequate. I used it at a NYE gig at the Grosvenor House Hotel Ballroom (not a small room) and it was brilliant. This with a Markbass LM250 at 8ohms and the Kappalite 3012HO. Great cabs.