Go to the TL-Sub web page For the benefit of those who don't speak German here is an English translation (thanx Timo):

The TL-Sub is a system which provided detailed reproduction down to subsonic bass. This ultimative deepest-bass subwoofer is ment to support big home-cinema systems Cine Top 170 / 200 or VOX in big rooms or small cinemas. The subwoofer can be positioned along a wall or standing in a corner. By not stuffing the pipe an enourmous efficiency was derived, in a corner position 114 dB at 20 Hz and a max SPL of 121 dB from 30 Hz up. The mechanical limits of the woofers set the max power limit of 200 W. It is recommended to power this system with an ASM 100 active module and a xover frequency of 50 Hz. If available, subsonic filtering should be used to protect the speakers from frequencies below 15 Hz.

Mechanical Max Load: 200 W Impedance: 4 Ohm Frequency Range: 18-50 Hz Average SPL/1W/1M: 89 dB , + 9dB in a corner Recommended Xover-Freq: 50 Hz (active please) Cabinet type: double transmission line Net volume : 300 L / 100 L