USE A MONO CD if you are going to wire speakers out of phase and have them face each other as suggested above-You need exact same signal going to both speakers if you want as much noise cancellation as posible
How to "break-in" new speakers??
A number of posts regarding the so-called "break-in-time" (or is it "burn-in-time) for new speakers have muddied the waters for me. If I recall correctly, some posts recommend that new speaker "break-in" could run anywhere from several hours to 175 hours, or more (good grief!), depending on the speaker manufacturer and model/type in question. In my case they would be the Rega RS-1 bookshelves. On other posts I have read that burning-in is a red-herring and should be ignored. I have also read that a proper burn-in should be done at a high volume, but not so high as to damage the speakers (an unnecessary caution), while simultaneously running the speakers non-stop for the necessary burn-in period. I find myself especially resistant to the last half of these recommendations, if only because I would like to think it possible to get a good nights sleep while simultaneously doing right by my speakers. I can only hope that however many responses I receive will not further muddy the already dark waters.