Bill, I didn't respond because I was kinda speechless. The idea of going to some lo-eff speakers that would seem to require a lot of top-end damping to get out the bass seemed like maybe it was too hot up there! I thought you were very happy with the 2226/DE250 combo when you first put it together, and it seems you woulda noticed something like this at that time if it was doing it then. Funny how we define registers- as a trombone player, you have a different idea of it than I do as a violin player. haha Wouldn't this still be in the 2226 territory? Middle C is 256 hz, and the A above it is 440hz, so F would be in that range. I agree with Wayne, I think there's something needs a little tweeking, and no one better to do that than you!