The rotary subwoofer is a great match for the Tympani IV bass panels.
Blending the two was easy, as I can adjust the level of the Tympanis
separately with my Mark Levinson 380S preamp (volume control is
adjustable in .1 db increments). The rotary is adjusted by a woofer
controller which has variable damping, phase, gain and the xover has
a range of 15 hz to 25 hz. The rotary is also adjusted for room size
with a variable speed controller, which when properly adjusted keeps
the fan speed steady.