Xcelsus XXS12

Specifications
Load capacity (RMS): 500 W
Load capacity (MAX): 1000 W
Impedance : D2
Oscillating coil : 3"
Resonant Frequency (Fo): 34.863 Hz
Total Moving Mass of the Diaphragm including Air Load (Mms): 175.956 g
Diaphragm Mechanical Mass without Air Load (Mmd): 169.702 g
Mechanical Q Factor (Qms): 3.554
Electrical Q Factor (Qes): 0.600
Total Q Factor (Qts): 0.513
Equivalent Compliance Volume (Vas): 40.525 L 

XXS12 subwoofer. From the first sound you will like what you hear. This is a really good subwoofer. High-quality, detailed Hi-Fi bass for natural sound.
It is ideal for small housings(boxes) from 20-27 litres gross capacity(VOLUME). It reproduces in an extremely accurate and clear way, while the bass integrates with the front set completely imperceptibly creating a coherent music band. We recommend using a subsonic filter and an appropriate amplifier quality to ensure proper drive and control.
And there is something to control, a powerful magnetic system, two four-Ohm coils placed in a rigid cast basket are supposed to command an aluminium membrane. Precision and real power – the perfect complement to high-end audio systems.