The Lehle P-ISO TRS XLR Stereo is a passive, two-channel signal isolator and DI box designed for maximum signal fidelity without tonal coloration. At its core are two Lehle Transformer HZ units that provide galvanic isolation to effectively eliminate ground loops and hum. It converts stereo signals from modelers, pedalboards, or keyboards into balanced XLR outputs and is engineered to handle high-impedance signals with ease. The circuit is entirely passive, requiring no power supply, and features a ground-lift switch for noise suppression. Due to its rugged design and bidirectional capability, it is equally suited for live performance and studio reamping applications. Developed by Burkhard Georg Lehle, it provides studio-grade isolation in a compact, road-ready format.