Also, I have to mention that while I do have the ability to use a delay, I rarely do because it is not perceptable to the guests. Think about this. Unless you are sitting in the 'sweet spot' (center back of the dance floor), you are not going to hear any time-aligned sound anyway. Example: If you are seated off to the side of the dance floor, you will hear the speaker closest to you first, followed by the sub, followed by the far-side speaker. I just believe in not over analyzing things and creating a 'problem' where none exists. YMMV. We need to remember we are not performing audiophile-grade, controlled-environment listening parties.