So I've got a Shuttle 6.2 with the matching 210 cab, and I am considering getting a second cab to go with it. If I'm running two 8 ohm cabs at the same time the head will be putting out 600W. Do both cabs need to be rated at 600W? On Genz's website the Shuttle cabinet is only rated at 400W, so I'm assuming that both cabs get the 600W of power distributed evenly. Any thoughts?