[Marke (Mark)]

I have an as new Velodyne EQ-Max 12" , only used for a couple months till I upgraded .

The info from Velodyne:

The EQ-Max 12 features technological innovation at an incredible value. The 450 watt dynamic amplifier and down-firing port go as low as 25 Hz while output up to 135 Hz at 3dB down further rounding out your satellite speakers' low end. Press the remote's EQ button to perform Auto-EQ, which matches the subwoofer's bass output to your room's acoustical characteristics using digital technology and a down-firing port to decrease distortion. Select the movies, jazz/classical, games or R&B/rock listening preset with one button press.

retail is around $1100 but selling for $750 but will need to be picked up
as it weighs around 20kg