As a general rule, amps perform better at lower gain settings -- the sound is cleaner, background darker, soundstage bigger, and sound less congested! Take O2 as an example. It is considered by many as TOTL comparable; it provides enough juice for power-hungry orthodynamic phones with its...

I remember reading that you can tell which model it is by the y-splitter's color. So what are they?          

Have been visiting this web site everyday in this few months, and finally here's my first post. I have a pair of DT770/250 for one year now. Either directly driving them from Denon S-301 or Sony NWZ-S638, or through FiiO e5, does not seem to be sufficient, hence am thinking about buying...