In reading Robert Harleys book on High End Audio, he states and excellent way for those of us that have a dial adjustment for phase adjustment on your sub. (I belive this will also work for those that have a toggle switch adjustment too). This adjustment is usually between 0° and 180°. The aim is to make sure that the woofers in your mains are in phase with the sub and not working against one another whch casues cancelleation of the bass frequencies. Here you go: Swap the speaker leads on your mains (the +(red) and - (black). Play a test tone thru your CD player equal to the point where you have your subwoofer cutoff set at, usually 80 Hz. Then have an assistant turn the phase control knob on you sub to the point where your mains are generating the LEAST amount of bass. When you reach this point, stop and your done! Then reconnect your main speaker leads as before, and you will have everything in proper phase. You should only need to do this once, unless you move or change you set up. I highly recommend this book! Lots of great tips if your a newbie or an audiophile.