More V9 info here.
My new rig!!! Ampeg V-9!
It's definitely a guitar cab, not a bass cab. Voiced for guitar. Sounds like a giant Fender Twin.
I've A:Bed it with a 8x10 flatback, and it has nowhere near the bass response. It's all high mids.
I thought you meant a MONSTER cab like a 4x18 or 4x21.