Radial Engineering SGI TX Instrument Line Driver (Transmitter Only)Radial's SGI Studio Guitar Interface consists of a transmit (SGI TX) and receive (SGI RX) pair of modules that allows a guitar signal to travel across 300 feet of balanced cable to a distant amplifier without noise or distortion. This makes it easy to send guitar and bass signals across large stages or feed amplifiers off stage, all without the interference and signal loss that results from using long " instrument cables. The SGI is also a helpful