i'm using dynatube feedde by my guitar passed through a presonus tube pre.
i found with a spectrum analyzer (voxengo SPAN) that there are a LOT of bass frequences in my signal (expcially with distorted guitars).
i tried to insert before dynatube the flexor highpass 8 pole (using McCyrano insert modules).
i think that the sound is much better in this way... have you any similar experience??
i agree to your answers, but the point was to use highpass on the dry guitar signal, before it comes to dynatube!
i feel that a signal with a lot of basses is not so good for dynatube, expecially with heavy distortion...