Because of the DTX 300 p’s design, which doesn’t have a lot of clamping force on your head, I had to use the ear/cheek simulator’s clamping mechanism to get the earpieces to mate well with the sim’s fake rubber ear. This almost certainly made the measured bass response a few dB stronger than you’d actually experience with the DTX 300 p on your head. Figuring that in, the frequency response measurements look fairly flat, with perhaps a bit of midrange boost and a slightly weak treble.
