That looks promising, reb1, though the on-line manual says that with my E2 it only supports "low quality" mode. I'll see what I can find here in the way of compatible headsets. Update: I've just found a cable to connect the E2 earphone socket to the Aux input of my early-1970s Pioneer amplifier, and the sound quality is quite acceptable. No hiss whatsoever, even with the treble turned right up. So, seems like the key, as others have suggested, may be finding a pair of earphones with suitably high impedance.