Thats right. I just tried out the SA5K with the ASL MG head III OTL amp (I use the T mode, not TL). And boy...its heaven!! It has better synergy with this old fashion tube amp than the expensive trafomatic due to the quieter background (however all the other high ohms headphones I tried are much better w/ the trafomatic...).
The richness in mid I feel is the perfect amount. And the speed and definition are so awesome, w. some jazz recording I can picture the shape of the mouth of the singer. This has NEVER EVER happen with any headphone, only my main system, with a 100w full tube amp.
And the high is just heaven....I listen to some Elizabeth Fraser and evanescence ...no sibling, harshness. just sweet high all around.
For the price I paid, this is a real bargain. I haven't tried high eff speakers yet, but I imagine it'd be of the same type of result: being high sen, low ohm, and ultra high speed, the realism is hard to beat.
SA5K + tube amp FTW!