I was just looking at Carvins website and they have 350 and 425 watt powered full range PA cabinets for not a ton of cash. Why couldn't a bassist just use one of these with a Sans Amp Bass Driver or similar DI device as a pre-amp? Wouldn't it be the same as using a rack mount pre amp, power amp, and several cabs...except more self contained, and way easier to carry. Or, use one of these powered speakers as like an extension cab, and run it from the line out of a smaller combo. When I was looking at these systems I saw in my mind what I think is missing from the bass world...affordable, high powered, combo amps. All that you'd need is some kind of pre-amp, which would be solved by using the Sans Amp. I must be missing something or else everyone would do this. What piece of the puzzle am I not considering?