I agree with Trendkillah, the head was probaly lined out to a rack full of effects and to the PA, probaly more sound coming out of the monitors than the cabs (if the cabs were used at all)when people go to a concert, they want to see rock stars, and what self-respecting rock star ain't gonna have a bunch of Marshall stacks behind them, I think thats in the rock star handbook, page 4, para:3, Showmanship 101