The ART dADB Dual Active Direct Box is a high-quality active interface that lets you connect instrument, line, or speaker level signals to a mixer or other balanced input thru a high performance audio isolation transformer. A pair of high impedance single-ended 1/4" inputs are converted by the transformer into an isolated balanced low impedance signal source. This active DI will run off of a 9v battery or phantom power. The dADB has an extremely flat and wide frequency response and can handle high signal levels while still maintaining an isolated balanced low-impedance output. This gives the ART dADB a very clean and neutral sound with a wide variety of signal sources and over long signal runs in high noise environments.