This frequently used type convinces with its strong sound absorption over a wide frequency range. It is universally usable and is characterized by the subtle groove of 2 mm. Acoustic wood panels have grooves in the front and have holes at the back. Probably the most popular among the grooves convinces with the fine groove of only 2 mm and the yet still good sound absorption performance. This product can be used in all areas like ceiling, wall or also closet doors and is basically universal. Thus, it has been in our product range since the beginning.