I have an Onkyo home theater setup and am using my old ADS L810 speakers as the mains (a huge improvement over the Onkyos). The problem is the center speaker (Onkyo) sounds terrible by comparison and the combination produces a very unbalanced effect. The Onkyo seems to have very poor high frequency response to the point where it's often difficult to hear dialog in a movie. In scenes where the dialog shifts to one of the ADS channels, the sound is crystal clear. I'm still using the Onkyo surrounds, as they are mainly for effects and are not as critical. I'm wondering if I can get by with merely replacing the tweeter in the Onkyo with a better driver, or if I need to buy a new center speaker entirely. Has anyone else done this and if so, what kind of tweeter would you recommend? I believe the existing tweeter is 8 ohms. Whether I end up replacing the tweeter or buying a new center speaker, are there any suggestions on how I can ensure a close sound match with the ADS speakers I'm using (ADS does not make center HT speakers)? For example, is it possible to do so by comparing certain specs, or is it just a trial and error method? Thanks.