How are your balanced Grados on the A-100 using the 500ohm resistor?
I'm fascinated by what you're doing with the A-100 and the 500ohm resistor. I really like the thought of using the A-100 as my sole headphone amp and using a 500ohm resistor for low impedance headphones - does it do the trick with Grados as well?
Fantastic actually. I tried them without the resistor adapter and there was a noise floor. I also tested it at max volume to see if I could damage the Grados. There was a rattle. But it seems to have gone away. Dunno what that was. Anyhow, with the resistor adapter, I can listen to the Grado perfectly fine, no noise floor, and it's absolutely energetic, fantastic. Sound stage is actually impressive on the Grado too. Great dynamics. They sounded like speakers pretty much.
I believe Brian just put them on the positive leads.