For those of you with experience..... I have a 6x10 Ampeg cab and I want to add another cab. I am thinking either another 6x10 or two 4x10 cabs. I figure I can pack the 6x10 or a 4x10 to smaller gigs and when needed pack the any combination of two to all three. My question is will two 4X10 Cabs move the same amount of air as the famous fridge 8X10?