Radial SB-1 – Active Mono DI Box

The Radial SB-1 is a professional active mono direct injection box designed for high-quality signal conversion in live sound, touring, and studio applications.

The Radial SB-1 is a professional active mono direct injection box designed for high-quality signal conversion in live sound, touring, and studio applications. Featuring a high-performance active circuit and transformer-isolated output, the SB-1 provides exceptional audio clarity, low noise, and accurate signal reproduction for a wide range of instruments and line-level sources.

Inputs & Outputs:

1 x ¼" Jack input – for instruments and line-level sources
1 x ¼" Jack thru/link output – for connecting to amplifiers or additional equipment
1 x XLR male output – balanced transformer-isolated output for connection to mixing consoles and audio systems

Control Features:

Ground lift switch – removes unwanted hum and ground loop noise
-15dB pad switch – provides additional headroom for high-output sources
48V phantom power operation – powered directly from a mixing console or audio interface

Built with Radial’s renowned touring-grade construction, the SB-1 is a reliable choice for bass, acoustic guitars, keyboards, playback systems, and professional event production where clean, transparent DI performance is essential.