Perfect for orchestral instruments like the violin, cello, and other instruments amplified by piezo pickups, the Radial StageBug SB-4 has been optimized to function with piezo transducers without sacrificing the quality of your sound. The StageBug SB-4 features a super high 5meg-ohm impedance that will polish frustrating peaks and widen your entire frequency response for a more organic sound. This DI also boasts a high pass filter as well as a 180 degree polarity reverse switch to give you more control over your sound.