I've only had the AD20 clip on me once, and that was due to having the levels punched.
I run CSB>battboxw/rolloff>AD20>DR7
Keep the gains on the AD20 very, very minimal, maybe a 1/4 of the way up. Since then I have yet to encounter a clipping problem with the AD20.
Are you using the SP box with the roll off or not?
Nope... the battery box is only power... no roll-off, and no level control. The dudes at SP told me that if I had the bb with level control, I would just be able to turn that down, but alas, don't have that...
I purchased the attenuator cable above (only $7) and I think I am going to mess around with that, and set it at a decent level, and then wrap some tape around it so it is consistent, and control the levels solely on the AD-20.
thanks for your responses!