View this product description in Norwegian.

  Class-D amplifier module for installation inside the VIBE18-SUB Mk2 speakers
  All you need is a screwdriver and 5 minutes of your time to make the transformation, no technical skills required!
  High output power: 800Wrms @ 8ohm  ~  1200Wrms @ 4ohm
  Balanced / unbalanced line input/output (XLR) with volume control.
  90-250Hz adjustable hi-cut filter for use in active subwoofers.
  Speakon output for optional passive 8ohm cabinet. (preferable same model)
  IEC input mains connector with integrated switch.