Element for modifying the acoustic characteristics of the listening room. Usually two are placed at each height. By default, upholstered in white cotton cloth. Tube diameter is 40 cm, height 105 cm. 50% of the perimeter is a reflector for medium and high frequencies. Absorption coefficient in the range 55Hz-400Hz is greater than 1. When reaching a maximum, it is greater than 1.2.
Other padding or height of the tube is also possible to implement on request. More to their use can be found on the website Audiolabk.