The Switchcraft SC800A is a precision engineered active direct box, which provides extended reach and high-quality audio fidelity for professional audio engineers and musicians. the SC800A derives its power from 48V phantom power and is designed to quietly preserve the tone of the world finest musical instruments. The unit is ideal for converting the unbalanced outputs of a passive musical instrument, such as an acoustic guitar and bass, to mic level signals that can be connected to a professional audio console and mic preamp.