I run a 4 ohm cab and love it, but I have an 8x10, so odds are, I won't be adding a second cab. The downside to having a 4 ohm is that if you add a second 4 ohm, you are now running at 2 ohm and a lot of amps won't handle that. With and 8 ohm, if you add a second 8 ohm, then you are at a...