Hi Dane-- earlier you said: If your mains are the B&W CDM 7NT series and you have put them in a cabinet, that will definately contribute to your problem. These are a vented box design that is ported front and rear. These types of speakers are designed to be installed at least 18'-24" away from the nearest reflective surfaces, like walls, etc. My guess is you have an abundance of muddy (boomy) base which is smothering the midrange. You need to get them out in the open so they can "breathe"! (My apologies if I have misunderstood where you have located your mains or if they are a model I am not familiar with.) Best wishes, and good luck!