I have a mid level Yamaha center channel that has a knob on the back that is used to match the tone of the center channel with other speakers (Mirage omni series). I originaly had it in the middle and it seemed fine. However it seemed some of the highs weren't as pronounced so I turned it all the way up. But now it seems like it has no bass when I listen to SACD's with no bass managent on but it could be the speakers limitations. Home theater is fine as I have the speaker set to small in the amp and it seems to blend fine. The speaker is rated 80Hrz-20Krz. My main question is that I want the speaker to exhibit its full range without losing any sound as it is trying to match my other speakers. So do I turn the knob all the way to the right or left or do I leave it in the middle. If anyone is familier with this type of adjustment I would appreciate any advice.