Thanks for the reply. A stamp on side of the magnet reads Made in USA by Eminence. A possible part # is 101329. Tech support at Eminence gave me parameters but would not calculate or reveal who they were made for. As follows: Re=5.54 ohms , Le=1.28mh, Qms=5.50, Qes=0.50, Qts=0.46, Xmax=6.2mm...