The best sound. Whenever you need it. The Radial StageBug SB-4 Active Piezo DI Box is the ultimate companion for your violins cellos and other instruments equipped with a piezo pickup. Whether youre on stage or in the studio youll get crystal clear audio. No squawks. No peaks. And no feedback. Simple yet powerful control. Alongside its plug and play design the SB-4 is ready for any eventuality. Instantly correct phase alignment with the 180-degree polarity switch. Or quickly tame your low end with the high pass filter. Its all there. Right at your fingertips. Portable and practical. The SB-4 is designed to fit neatly into your instrument case. And with a robust construction youll never have to worry about knocks and drops getting in the way of your performance. This is the easiest way to guarantee professional sound. Performance meets practicality Ultra-compact. Without compromising on quality. The SB-4 gets its superior audio from high 5 meg ohm impedance smoothing out peaks and squawks often associated with piezo transducers. By broadening the frequency response you’ll get a balanced natural sound on stage and in the studio. Plug into your PA or tuner directly via the dedicated AUX input. And run long cables without signal degradation. All without needing batteries or power cables. This is the ultimate companion for your piezo equipped instruments. Features Get the best sound from your violins cellos and other piezo-equipped instruments Effortlessly smooths out peaks and eliminates squawk Fit neatly into your instrument case thanks to an ultra-compact design Plug in and play design – no batteries needed thanks to 48V phantom power Instantly reduce excessive bass with a built-in high pass filter Connect instruments to your amp or tuner directly via the buffered 1/4” AUX out Pristine connection to your mixer or mic preamp with the 600 ohm balanced output Tame hotspots that cause feedback with the phase alignment switch Robust construction protects against knocks scratches and scrapes Specifications Audio circuit type: Piezo optimized active buffer Frequency response: 20Hz 20kHz (± 1.0dB) Total harmonic distortion: Dynamic range: 100dB Input impedance: 5Meg Ohms Maximum input: +4dBu Gain: +2dB Output impedance: 330k Ohms Equivalent input noise: -101dBu Noise floor: -97dBu Inter-modulation distortion: Phase deviation: 10° @ 50Hz Switches: High Pass Filter Phase Ground Lift Low-cut filter: 150 Hz Filter slope: 6dB/octave Instrument input: 1/4″ buffered with piezo optimized load Auxiliary output: 1/4″ buffered to drive guitar effects amplifier or tuner Balanced output: Pin-1 ground pin-2 (+) pin-3 (-) Polarity reverse: 180° Ground lift (input): Soft lift with 100 Ohms to ground Construction: 16 gauge steel chassis & outer shell Finish: Baked enamel Size: 4.5″ x 185″ x 1.35″ (114mm x 47mm x 34mm) Weight: 0.55 lbs (250 grams) Shipping Size: 8.25″ x 5″ x 1.75″ (210mm x 127mm x 44mm) Shipping Weight: 0.8 lbs (365 grams) Power: 48V phantom power Warranty: Radial 3-year transferable