Some info I found on WorldCarfans
Dynaudio sound system
The sound system developed for the Golf by Volkswagen and the Scandinavian hi-fi specialist Dynaudio can be paired with any of the 300 or 500 series units. The Dynaudio sound system offers pure high-tech sound: the four 168 millimeter woofers – made of a magnesium-silicate membrane, a very light 74 millimeter voice coil and an internal magnet design in a stiff plastic basket – provide for precise and powerful bass with high pulse fidelity in the doors and in the rear side panels. The 50 millimeter and 60 millimeter tweeters in the door and side trim supplement this sound with exceptionally clear transparency and complex sound impressions.
The loudspeaker system is supplied by a newly developed, digital 300 Watt amplifier; it consists of eight Class AB output amplifiers. The capabilities offered by the digital sound processor (DSP) for so-called propagation time correction (goal: to make a correction so that sound waves from all loudspeakers reach listeners’ ears simultaneously, regardless of their locations in the vehicle) and frequency equalization guarantee a sound experience of the highest level.
http://www.worldcarfans.com/9080908.005/page6/volkswagen-golf-mk6-in-depth