Radial Engineering StageBug SB-4 Piezo Instrument DI Box with Impedance Matching and Low-Noise Output

The Radial Engineering StageBug SB-4 is a compact active direct box specifically designed for piezo-equipped instruments that require proper impedance matching for accurate tone reproduction. Ideal for acoustic guitars, violins, mandolins, and other piezo-based pickups, it ensures a clean, natural signal with improved clarity and reduced harshness.

At its core, the SB-4 features a high-impedance input stage optimized for piezo transducers, preventing tone loss and preserving the full frequency response of the instrument. It is powered via 48V phantom power, making it easy to integrate into any professional PA or recording system without the need for batteries.

A built-in low-cut filter helps reduce unwanted low-frequency rumble and stage noise, improving overall mix clarity and feedback resistance. The SB-4 delivers a low-noise, transformer-balanced output for clean and reliable signal transfer to mixing consoles, audio interfaces, and PA systems.

Housed in Radial’s durable steel enclosure, the StageBug SB-4 is compact, road-ready, and designed for simple plug-and-play operation in both live and studio environments.

Key Features:

• Active DI box optimized for piezo instrument pickups
• High-impedance input for accurate tone preservation
• 48V phantom power operation (no batteries required)
• Built-in low-cut filter for rumble and feedback reduction
• Low-noise, balanced output for clean signal transfer
• Improves clarity and natural tone of acoustic instruments
• Ultra-compact StageBug design for pedalboard or instrument mounting
• Rugged steel chassis for touring durability