Quote: That`s for sure.   What I mean is the Neco portable amp worth to recommend since its performance is quit good compare to my tube amp which I think it is pretty good to me. 

Quote:   Try Neco portable amp v2,  maybe you would change your mind.

I tried to drive Beyerdynamic DT770 600ohm with Neco portable amp, It's a big surprise because  DT770 600ohm sounds so good;  everything is there and no sound quality decrease could be detected by my ears. It is powered by a 9v battery, but it is sound the same when it powered by the wall wart...

Quote:   I am sure it is linear type, it is cheap because it is only supply 400ma current max, but it is enough for Stepdance since it consume 50ma current. The 200ish big linear one could supply up to 10A or20A or even more current which is not designed for power small appliance. Maybe...

Oh, come on, What is your point? My iaudio 7 can drive HD600 without any problem either, but they sounds totally different. The Neco dual mono portable amplifier could be used as high quality desktop as well as portable headphone amp.

I bought a 12vdc linear regulated power supply from RP electronic( the store in Burnaby ) with a 2,1mm to 1,3 mm adapter totally cost around 16$. I tested it with my Meier Corda 3move and it sounds the same as powered by 9v battery. I assume it would work for the Meier Stepdance.