I know you guys probably hate it when I chime in on this, but there was an improvement in upper base response when I added the VP160 into my M22 / EP350 / QS8 mix. Using the Police, Certifiable where you watch Sting play bass, there is a definite boost in the upper bass response with the VP160. I could see him playing the upper bass, but not hearing it before I added the VP160.

(Oh noooo. That can't happen because I've never experienced it.)