Gpa 416-8c

[Alien_Shore]

Yeah, the published Xmax is 3.8mm.
The Fs I measured right out of the box is pretty close to what GPA publishes (within 5%), which is good to see. The Qts and Qes are pretty far off though, enough to change the EBP considerably (the published specs yield a box size of 4.7 CF tuned at 23 Hz). Does anyone know if Qes will change much as the speaker breaks-in? I would expect Qms to move some as the suspension loosens a bit.

The beefy Le is probably due to the beefy voice coil and no shorting rings, so a zobel will likely be in the new XO...

I can tell you that the speakers sound amazing even on the current crossover (designed for my old 416As). It's going to be fun designing a 2-way using these drivers!