Inductive power supply to reduce any type of disturb from the mains to the line stage, zero global feedback from input to output, fully differential circuit (differential input and differential output) with discrete components dual-mono configuration, digital volume control without operational amplifiers, relay input switches to minimize non-linearity, oversized military resistors to minimize thermal distortion, "Audiograde" capacitors based on Airtech specification, microcontroller management, Airtech internal wiring and gold plated connectors.