However, I'm still a bit confused. The specs for 15A at eminence web site and the specs from the link at Pi site are different.

Parhaps the values describe similar drivers and I can't see it?
Could be the case, I just see numbers, I don't understand them.
But these numbers look very different.

For example, from eminence website:
Resonance 33Hz
Usable Frequency Range 51Hz-1.7kHz
Sensitivity*** 97.3
DC Resistance (Re) 5.28
Coil Inductance (Le) 1.04mH
Electromagnetic Q (Qes) 0.33
Mechanical Q (Qms) 5.69
Total Q (Qts) 0.32
Compliance
Equivalent Volume (Vas) 9.1 cu.ft.

From the PDF document at Pi web site:
Resonance 39hz
Usable Frequency Range 35Hz-2Khz
Impedance (Re) 4.98ohms
Coil Inductance (Le) 1.48mH
Electomagnetic Q (Qes) 0.37
Mechanical Q (Qms) 8.57
Total Q (Qts) 0.35
Compliance
Equivalent Volume (Vas) 6.92 cu. ft.

Thanks!