I recently picked up a new Epifani UL310 and matched it up with one channel of a Crest CA9....and it was heavenly! It sounded so freakin good, in fact, that I am in the process of adding another UL310 to run off of the other channel of the CA9! I opted for (2) UL310's instead of a UL610 for portability issues. I can just take one cab with me for practices, and small gigs, and add a second for the larger rooms. The 2 stacked together will be my ultimate rig of doom! Yes, I need 2 cabs to compete with a very loud drummer and guitarist in a rock band. Has anyone actually heard 2 UL310's played together? If so, what was it like, compared to a single UL410.