Vifa D25AG-35-06 Note: By clicking the images you will get a bigger image (not all).

As tweeter I chose to use Vifa D25AG-35-06. This driver has an aluminium alloy diaphragm and is filled with magnetic fluid. Many well known speakers use this driver, for example PSB, Audiovector and QLN speakers.
Driver specifications

TABLE: Specifications 
Nominal impedance                   6 ohm
Nominal power (IEC 268-5)         100 W
Frequency range                1.5-35 kHz
Sensitivity                        89 dB
Effective diaphragm area          7.1 cm²
Voice coil resistance             4.6 ohm
Operating power                     5 W
Voice coil diameter                25 mm
Voice coil height                 1.6 mm
Air gap height                      2 mm
Free air resonance                850 Hz
Moving mass (inclusive air)       0.3 g
Force factor Bxl                  3.3 Txm
Magnet weight                     240 g
Frequency response

From the graph you can see the driver has piston movement to above 20 kHz. The graph shows the tweeter's impedance to. (Note: The frequency plot is shifted one decade compared to the woofer frequency plot.)
Decay spectrum

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