The DI-1 is a high-quality direct box with crystal-clear sound for transforming high-impedance, unbalanced instrument outputs to the low-impedance, balanced inputs of a mixing console. It features an active direct box with superior frequency response compared to conventional transformers. The unit operates on a 9-volt battery or phantom power from a mixer and includes phase reversal and ground lifting switches, as well as three input level switches. Its sturdy, compact design ensures durability and ease of use.