I ran it at 1 ohm for a few weeks, till I sold my K's. never got hot, or shut down. I bought it new, it was discounted because of a cosmetic defect. a small ding on the underneath of the amp, can't see it if your not looking for it. I am actually coming up to Iowa, to fort dodge next weekend, not sure how far away that is from you, could maybe get together, let you see it. let me know.