Wayne, I measured a pair of Delta 15A pro drivers I have and this is the result using WT2:
Revc 5.7 ohm
fs 40 hz
Qes .38
Qms 3.99
Qts .35
Zmax 53 ohm
Le 1 mH
eff 97.8 db/watt (3.874 %)
Vas 8.3 cu ft
The other driver measured really close to these specs also!
I'm looking at using a 7.75 cu ft cab.
What would you recommend for tuning the port frequency???
Regards, Ron