Anyone here measured a similar driver to this, I'd like to model it, but found it a bit unusual compared to others. It came out of a Sony SS-WS102. I held a 3" dia paper tube onto the port to see what that tuned it to, and to see if there's any chance it might work for my intended use, and I was surprised at how well controlled the excursion was, having a total port length around 30" tuned to around 30hz. I found out why: tapping on it rings around 70hz fs, and the suspension is unusually stiff. The response curve wasn't that bad down to 24hz with an unexpected peak around 26hz. I thought it was a 6.5", but it's a 7.5" (so that's a plus) with an extra large surround like it was meant to take some overexcursion punishment, though the coil overhang is probably around 4-5mm, it's very hard to see though. Completely different driver in many ways to a similar Sony sub.
