T/S parameters for Hokutone/NMB drivers?

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Does anyone know a source for T/S parameters for Hokutone (now NMB) drivers? They are low-cost, seemingly decent quality polypro drivers, but have no way to get the specs.

I've built two designs already with the drivers, but would like understand them better as I want to start using them in dipole/ob designs.

I assume I'd be better off using higher cost/quality drivers, but they seem to be of reasonable quality, low cost and I like the flat response and roll off of polypro. Still, if you know anything about these drivers, your opinions are more than welcome.

Yes, I know in theory how to measure the specs, but haven't had the time to do it properly yet. Anyway, it's always best to ask...

Thanks!
 
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