DAC/Headphone Amp - Low Gain or High Gain.

[Tinobambino]

A seemingly simple question. I have a Firestone Audio Fubar IV DAC/Headphone Amp playing Apple Lossless into Grado SR325is headphones.
Do I set Gain High or Low for best results?

[Ernie]

Low gain for Grados unless you want eleven at seven...