This might interest you guys:
"On a lark, I decided to make up a 1/4″ stereo jack to banana plug adapter and drove my Etymonic ER-4S in-ear headphones from the speaker terminals. The Etymonic ER-4S are a high impedance design requiring watts rather than milliwatts to drive properly. The Black Magic 20 did a remarkable job as a headphone amplifier. The noise floor was very low and the dynamics outstanding. Bob Carver could add icing to the cake by providing a headphone jack on the front panel. There’s an empty spot calling out for one on the right. And lest you think I’m crazy, my mastering instructor uses a Bryston power amp for his headphones, and he has over 200 gold and platinum records and 10 Grammys to his credit."
There is a picture of the adapter he made up. Seems like a nice way to use this amp. Does anyone here have it?