Originally Posted by
jimd
The target DCR of an 8 ohm 416, is 6.5 ohms. Normal deviation ought to be 6.2-6.8 ohms. 5.5 ohms is the usual DCR of a MI speaker, 417-418-421, a lot fo JBL's, Eminences etc. They are actually 7 ohm (real impedance), not 8 ohm drivers. The lower DCR makes the speaker a bit louder, it is, it's drawing more current.
Sounds to me that you have a recone with improper parts, it is going to hurt, well, it depends on the voice coil that's in there. The 416-515-604 8 ohm coil is .2 inches winding depth, the 417-418-421 8 ohm coil is .3 inches deep. The current MWA replacement coil is .28, although it's the right DCR. The longer coil will simply mean your 416 will have less linearity, if it's deeper, you won't know unless you take it apart. If you are real careful, you can get it apart, but you will need to be as good as a professional reconer to do that.
As for the crossover, it will be a little off, if you are real critical you can compensate, if it's BiAmped, it won't matter. GPA uses the LF cone in all it's recones. it's a little better behaved than the original, but a touch heavier. Lots of contingencies here.
Jim