I was always curious as to whether this was discouraged because after a time the life of the head will be reduced, or if you very likely will blow the head then and there. does the level of "crankage" on the gain knob matter? can you run a 4 ohm min amp into 2 ohms at low levels? some heads of seemingly similar design form the same manufacturer have different minimum ratings. for example, the older eden 300 and the newer eden 550. the 300 is rated to only 4 ohm, while the 550 is rated to 2. they are basically the same head though, arent they>? I guess my questions is, does anyone run their amps into lower-than-rated-impedance, and to what effect? this questions IS hypothetical... iam not experimenting.