With a proprietary circuit design by Fred Forssell and a superclean Lehle step-down transformer, the ultra-transparent TDI and TDI Duo capture outstanding sonic performances with minimal distortion, noise interference or signal loss from long cable runs. The TDI and TDI Duo's active circuitry delivers top-grade sound quality while minimizing distortion and noise interference and maximizing your signal over long cable runs. A ground-lift switch eliminates any remaining hum or noise that can arise from grounding loops. Though designed for instrument-level signals generated by passive pickups, the TDI and TDI Duo are perfect for line-level signals from drum machines, samplers, and synths. The TDI and TDI Duo are built to last with a rugged steel chassis, ideal for tours, stage backlines, and years of rigorous studio use. You can also mount three TDI Duos onto a standard 19" universal rack tray to create a six-channel 1U DI station. Phantom-powered DI box with active circuitry Ultra-low-noise JFET buffer drives exceptionally clean Lehle step-down transformer High-fidelity sound quality with mitigation of distortion and noise interference Enhances signal for long cable runs protecting against degradation Compact, road-ready design with rugged durability -20 dB pad for speaker-level signals and active instruments Made in the U.S.A.