Absolute jester Addictive Who likes to listen to loud comes fully with this headphone amplifier at his own expense, have the Teac tried at different AKG and Sennheiser headphones 38-250 Ohm, a true ear Killer runs with me on iMac and iPad, tonally absolutely balanced with a nice spatial representation in Life Music is a fun without end, through loudspeakers Klipsch Heresy III and I hear Dynavox pulse III on tube KT88