The ART Dual ZDirect and its single-channel counterpart are high-quality passive direct boxes designed to connect instrument, line, or speaker level signals to balanced inputs. The circuit features a high-performance audio transformer that provides a flat and wide frequency response while handling high signal levels without saturation. It offers complete electrical isolation between input and output, effectively eliminating hum and buzz caused by ground loops. The unit includes a switchable low-pass filter to roll off unwanted high-frequency noise and a phase invert switch for signal alignment. Its rugged aluminum case is designed for heavy-duty use in both live sound and studio environments. No specific collaborations are noted; it is a proprietary design from Applied Research & Technology.