Finally cranked the V4b today with my goliath 2 4x10 that I had, with our guitar player and vocalist, and it has absolutely no shortage of volume whatsoever. With the gain up I had the master at 3-4 tops and it brought down the house. I was pretty pleasantly surprised, the cab tone sounded STELLAR too; I never thought I was working with a cab that was capable of sounding that good. It just needed a great amp behind it. Looking at a preamp potentially now and I think I'll be good to go. Saving some serious $$ not needing a new cab!