I was playing around with the bi-amp feature of the DB680, running each signal into one side of a CA9 with lows going to an NV215 and highs going to a Marshall 4x12 with V30's. Kinda fun.
Aguilar DB680 biamped into Berg NV215 & Marshall 412.MOV - YouTube
Before I did this, I ran the highs into the Bag End stack and it sounded great as well - the Bags have a lot of nice crunch to them, maybe better than the V30's.
DB680 bi-amped into NV215 and Marshall 4x12 - video 
