hey guys, i just bought a peavey tour 450 bass head a few days ago and used it in band practise with my metal band. I have found it to be not loud enough, and i have it as loud as i can without it clipping too much, pre gain75 percent of the way and post gain 100 percent of the way. It is running at 8 ohms at the moment into a mag 410 deep 8 ohm cab. To make it louder i have resolved to buying a second cab to add on to it, i use my amp for metal. what cab combination would be the loudest, my 4x10 with a 2x10, 1x15 or another 4x10? Help would be greatly appreciated!