is there REALLY a difference? I mean, the only difference is well the obvious amount of power i suppose. ie 200 watts at 8 ohms but 350 at 4ohms I have a 4 OHM ampeg 1x15 but id like to add another cab. Going to an amp that offers 2 ohms might be reasonable...BUT if i don't want to go to an amp that goes to 2 ohms, would I hear a big difference in sound and tone if I used 2 8 ohm cabs to get the full power at 4 ohms? thanks!