I stand corrected.. All the drivers in the 6505, triple xxx and jsx cabs are all sheffields which is brand owned by Peavey. However each type has been custom done and branded for each specific enclosure..
Just started doing a bit of recording with the head today with the cab. Sounded really tight and clear with not too much fizz.
Then after a while it started making a wierd noise. Called up James at Peavey and getting a replacement sent out tomorrow and having mine collected. TOO speedy haha - awesome customer service
Seriously though peeps, check out JSX cabs, the nuts! A mates bringing round his 6505+ next week to try it out. Will try and get some clips