You could Daisy Chain the 500 to the 200. (or vice versa)I really, really would like to find a 200c to put under my 800 as a 15" cab... I wish they made a 15" cab that matched identically to the 800 2x10 combo....
I haven't tried it yet, but I do believe, (if the 500 is your primary or has bass connected to it) you can 'SEND' from the 500 to the 200 "Input" or 'RETURN'. I think 500 SEND to the 200 RETURN would retain the 500's Preamp sound config, basically using the 200 poweramp for its 15" with the preamp of the 500.
(BASS GUITAR ~~~~~> 500 Input > then 500 SEND to ~~~~~~> 200 RETURN
I'm sure there are other ways to do this but after a ton of brainstorming I think this would be the best bet.
Now... if you wanted to independently shape the sound of the 15"/200 then SEND 500 to the Input of the 200 then eq the 200 accordingly.
