Hi! I'm looking for some specs about the Mesa Boogie Big Block 750 and the Mesa Boogie Powerhouse 1000 (4x10"+15"). I can't find this info on their website. How much power will the BB750 do at 4ohm? Freq range of the cab? Sensitivity? What do you think about the combination? Is the power enough for metal at pretty large stages (up to 1000 people).I can't try before ordering it. It's a lot of money (but hopefully I'm working out some endorsment deal with my dealer). I like the 400+ anyway. Thanks!