by marty_e » Tue Oct 17, 2006 3:52 pm
Hi CIA, I recall the late Mang Lino (Dima) telling me that off center speaker drivers are often caused by the weight of the magnet pulling down on the driver basket over time. Inverting the speaker or its position within the baffle this may cause the sag to correct and re-align itself, it at all. It takes a number of years for the magnet to pull down on the driver. It would probably take the same length of time for the basket to re-align itself if it were inverted. Not sure you'd like to be listening in this manner for a number of years...
Speakers that have already sagged over time is characterized by the woofer incursion/excursion impeded by edges of the driver basket. May sayad, as he would say. If you were to gently push the driver in and out, ala box-test, you'll feel the driver kind of grating over the edge in one side - usually the bottom. I'm not sure how playing the speaker in inverted position would sound, never tried.