I've got a 300W 8ohm amp going into a 1x15 cab and a 4x10...both 8 ohms. I usually run each cabinet in parallel directly out of the amp's two outputs. What is the difference between doing this and running the 15 off the 4x10 in series? Does it matter at all how it's hooked up? If so, what's the ideal setup? Need....more....power.