Forgive the naive nature of the question, but I want to get myself straightened out on something. Here's a set of specs for the sake of this conversation: AMP: 400 watts @ 4 ohms and 200 watts @ 8 ohms. Two cabs: 1.) A 2x10 @4ohms rated at 500 watts. 2.) A 2x10 @8ohms rated at 250 watts. When used one at a time, will 4 ohm cab be louder than the 8 ohm cab? I realize that one cab is drawing more power from the amplifier (4 ohms) but is it actually pushing any more air? Let's assume same brand, and same cab design, you just have two to chose from, one is a 4 ohm 2x10 the other is an 8 ohm 2x10. Some companies offer choices like this (such as Carvin) presumedly to allow you to set up your rig with more than one cab if need be, so I'm just trying to gain an understanding of something here. Many times when I think I "get" something I come to learn I had it all wrong. Thank you.