Currently in development by Holton Audio

USB portable multi channel headphone amplifier (Will drive 4 x 32 ohm headphones sets)

1 x Burr Brown 24bit 192khz PCM1794A DAC

4 x OPA1622 headphone amplifiers ICs

USB powered and charged and operated independently with on-board lithium battery.

USB, SPDIF, Optical selectable input sources.

Independent volume control for each headphone set.