A more laid back sound IS faster.
The planar driver does the attack of the note and then stops. The dynamic driver does the attack and then is still moving around, blurring the sound and causing distortion. That distortion is "exciting" because it is more stuff going on. The laid back, undistorted driver is making less sound because it is faster.
It is Bruce Lee vs Stupid Guy. In the blink of an eye, Bruce Lee has quickly whacked the other guy and then is "laid back" waiting. Stupid Guy is moving around, talking trash, wasting energy, and his slow strikes are easily avoided, and then Bruce Lee quickly goes "whack"....
Denons are famous for more bass, though, of course.