I designed the SPL speakers. The SPL215B had the SPL 915E in it. You can tell a 915E from a 915R by the aluminum dust cap. 96 oz magnet, 3" aluminum rectangular edgewound voice coil. As I remember, the magnet assy weighed more like 23 lb. It actually saturated the gap (about 20,000 gauss). Can't get any more. Last I checked, JMAC in Portland Oregon still had some replacement parts for the SPL stuff. I sold the entire Sunn speaker manufacturing line to Randy Summers of Tech Audio in Milwaukie Oregon (just south of Portland) He is still in business, not sure if he still has any parts or not. Don....where did you get your parts? Power handling...yep, they held together fairly well. I designed the voice coil to be closer to the pole piece at room temperature, so at about 500W RMS pink noise, it would expand to ride dead center between the pole place and top plate. The most common failure was the just fatigue where the coil wire met the tinsel wire.