Vifa P17WJ-00-08 Note: By clicking the images you will get a bigger image (not all).

I chose to use Vifa's well known P17WJ-00-08 as woofer. This driver has a basket made of magnesium and a very rigid polycone filled with mineral. The woofer is intended for bass reflex enclosures of 10-30 liters. Many well known speakers use this driver, for eksample PSB stratus gold, Audiovector and QLN speakers.
Driver specifications

TABLE: Specifications 
Nominal impedance                   8 ohm
Nominal power (IEC 268-5)          70 W
Music power (DIN 45.500)          120 W
Frequency range               37-5000 Hz
Sensitivity                        88 dB
Effective cone area               136 cm²
Voice coil resistance             5.8 ohm
Voice coil inductance            0.55 mH
Operating power                   6.3 W
Voice coil diameter                32 mm
Voice coil height                  14 mm
Air gap height                      6 mm
Free air resonance                 37 Hz
Moving mass (inclusive air)        14 g
Force factor Bxl                  6.5 Txm
Magnet weight                     415 g
Qms                              1.55
Qes                              0.45
Qts                              0.35
Vcs                              34.7 l
Frequency

The response is as you can see very smooth. The graph shows the woofer's impedance too.
Decay spectrum

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