3rd on the CV D-9...
What is the room size? Reason for asking is when I had my D-9's, I could not get them far enough away from Turntable so I had to reduce the bass from flat to almost all the way down in order to crank them. My amp's sonic filter helped but could still see woofer bounce from feedback, mainly on silent or lower passes. The room size was probably 12 x 16 w/8' flat ceiling if I remember correctly.
Not saying this will happen with you, just mentioning my experience with my conditions