Putting a typical direct box on a high quality analyzer can reveal all manner of hidden issues – units sold as premium often exhibit audio behavior that is anything but, especially in the low frequency region or in measured total harmonic distortion.
If you disregard all of the technical mumbo jumbo it just boils down to this: the audio running through your direct box is often being treated poorly.
Our phantom-powered and transformer-isolated PCH X1 and X2 active direct interfaces are different.
Sonically Transparent.
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.