HP 15 "(38cm) part of the E38 series PHL AUDIO catalog.

Power: 350W RMS
sensitivity: 100dB
Bandwidth: 50 - 3kHz
Impedance: 8 Ohms
Resonance frequency: 44 Hz
Coil Diameter: 3 "(76 mm)
XMAX: + - 7mm (a real low HP)

Weight: 9.1 Kgs

I own four.
So I make SUBS 2x 38 cm below the falls and hits hard !!!!!

Product quality and extremely reliable, PHL AUDIO's not kidding!