I found this:

Technote Tn30 Jumper Settings OA Cards

which implies I do need 2 separate OA03�s for a L sub and a R sub. But I think that would just give me dual mono subs if I�m interpreting correctly. Mconfig gives the choice of stereo subs when I add a single OA03 with jumper setting 6, which is my preference (both for sound as well as $ expense). I know there have been numerous posts on stereo subs but I can�t find any that reference the OA03 and jumper settings. Apologies if this has been covered before and I�m just not seeing it.