View this product description in Norwegian.

Class-D amplifier module for installation inside the VIBE15 Mk2, VIBE30 Mk2 and VIBE15-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: 500Wrms @ 8ohm  ~  800Wrms @ 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.