The POPE Professional PD 2111 high frequency compression drivers are measured sensitivity with a 1m W input on a 25 mm (1 in) terminated tube, averaged from 540 Hz to 2.5 kHz, shall be at least 118 dB SPL. Measured sensitivity with a 1 W input at a 1 m distance on axis from the mouth of a horn with a Q of 6.3 averaged in the 2 kHz octave band shall be at least 111 dB SPL. As an indication of electromechanical conversion efficiency, the Bl factor shall be at least 18 newtons per ampere. Frequency response, measured on a terminated tube, shall be flat within ± 1 dB from 500 Hz to 3.3 kHz, with 6 dB/octave roll-off above that point. Nominal impedance shall be 8 [16] ohms and power capacity shall be at least 100 watts normal speech or music program material.

Model	PD-2111
Throat Diameter	50.8 mm (2")
Nominal Impedance	8 ohms
DC Resistance	4.3 ohms (H), 8.5 ohms (J) ±10% @ 25° C
Power Rating	100 W continous program above 540 Hz 150 W continous program above 1kHz 400 W Peak Power
Sensitivity	116 dB SPL, 1W @ 1m
Frequency Range	535 Hz to 20kHz
Recommended Crossover	540 Hz or higher, 12 dB/octave minimum
Diaphragm	0.05 mm (0.002 in pure titanium
Voice Coil Material	Edgewound aluminum ribbon
Flux Density	1.9 T (19,000 gauss)
BI Factor	12.7 (H) N/A
Dimensions	235 mm diameter & 131 mm depth
Net Weight	12.2 kg (26.8 lb)