I've been reading the specs on this amp and it says it has a 4 ohm/2 ohm selector on it. Is 2 ohms comfortable for this amp? or would it somehow shorten it's life? The reason I'm asking is because it can't handle an 8 ohm for some reason according to the ampeg website, and I want to have two separate cabinets for moving purposes, probably a 4x10 and an 18. Do you think this amp would be comfortable at a 2 ohm load? thanks for the feedback.