The JustBoom Amp is a standalone high-quality audio power amplifier designed to either stack on top of the JustBoom DAC or DAC HAT or alternatively take a line level input. JustBoom Amp can either be used as a standalone amplifier or it can be stacked on the JustBoom DAC HAT or DAC boards to make a fully integrated DAC/Amp combo by a board to board connector and mounting hardware.
eBay