Strymon's phantom-powered and transformer-isolated PCH X1 and X2 active direct interfaces are different. Designed to be pristine-sounding before any other feature, these are units that you can trust implicitly to handle your audio, no matter what kind of signal it is. Other direct boxes can distort low frequencies to the point where a low B on a bass guitar barely resembles the input, but the PCH X1 and X2 remain flat from far lower than that (10Hz) to well above what dogs can hear (80KHz) within a half of a db, as well as remaining clean and quiet throughout that range.