Subsystem Technology acoustic (SST) custom and standard Tube Bass Trap units.
The absorption range is between: 20 Hz – 400 Hz (depends on its diameter).

Available diameters: 22, 28, 35, 40, 50, 60 cm.

Standard height 107 cm.

Professional design and workmanship, tested in acoustically treated listening spaces
Dimension of one TUBE TRAP: 1070 x 350mm (107×35 cm)
TUBE TRAP is used to improve the acoustics of space such as:
– HOME CINEMA
– HOME MUSIC LISTENING ROOMS
– RECORDING STUDIO
– Office
– HIFI listening rooms
– DECORATIVE FUNCTION IN SPACE

TUBE TRAPs cylinder shape gives the structural rigidity and internal air cavity necessary to absorb sounds in the low frequency range of 60–400 Hz. Their diameter determines how deep and in what range of bass they perform their absorption function.
Because TubeTrap absorbs unwanted sounds, and their cylindrical shape makes them ideal for the function for which they are intended, and give maximum results in the space in which they are placed.
This type of Tube Trap is equipped with a adjustable Treble Balance Control surface (SST technology), with the built-in Treble diffuser that corrects the clarity of the sound in space.
More details about the product you’ll find at the site:
ssteu.com