The Amp Box RS delivers high-end sound a compact elegant aluminum chassis. The fully balanced dual-mono circuit design incorporates a tube input buffer stage for reference-grade sound quality. Premium parts are used throughout this ultra-high efficient (92%) PWM amplifier design including ultra reliable dip switches and anti-microphonic chassis construction. Delivering 120W x 2 into 4 ohms and 90W x 2 into 8 ohms, the Amp Box RS remains stable into even a 2 ohm load! A robust and highly regulated outboard power supply is capable of delivering ample voltage for impressive dynamic capabilities and in the near future, an upgraded power supply will be available as an option. It really is extraordinary how much power and fidelity the Amp Box RS can deliver in such a compact package.