If you ever deal with piezo pickups on acoustic or orchestral instruments in your day-to-day playing, you need the Radial PZ-DI. This DI box has been calibrated specifically for piezo-sporting instruments, but it's not a one-trick pony. The PZ-DI allows you to correctly match impedance to the source for the perfect frequency response, whether you're playing a violin, cello, or other acoustic or orchestral instrument. And with variable low and high-pass filters, you get the chance to provide perfect resonance and smoothness to your sound.