My guess here is that some people like the wet sound of "underdamped" amp/THX00 combos. An underdamped headphone can be perceived as being richer and more forgiving. It can "smooth over" the roughness of poorly recorded/mastered/encoded music. Glad people are enjoying the THX00 in new ways. One good thing about the THX00 is it has a flat impedance curve, so an output impedance above the 1/8 rule won't change the frequency response (which would likely give it truly obnoxious midbass if it did), so you only have to deal with damping effects with higher output impedance amps.