The SB-1 is the ideal companion for acoustic guitarists on tour. This smallest Radial DI box does not require batteries thanks to phantom power supply. Despite its compact size, the SB-1 is a fully equipped DI box with the following features: low-noise active design, Thru feature for the input signal with automatic balancing and impedance conversion from Hi-Z to Lo-Z, 220 kOhm input impedance creates a "vintage sound" and is perfect for guitars with low output, -15 dB pad qualifies it for recording electric bass and keyboards, as well as a phase inverter that eliminates stage resonances.