Samson's line of S-Max Direct Boxes combine premium sound circuitry with all-metal, impact resistant construction to provide high-quality signal connection solutions for live and studio applications. The MDA1 Mono Active Direct Box is ideal for running longer signals to your mixer in high interference environments. An input attenuator lets you adapt the MDA1 to a wide variety of signals, while a Ground Lift switch enables you to further remove hum and buzz. The MDA1 can run on 48V Phantom or 9V Battery power.