t.akustik Spektrum P816 Absorber, Perforated Absorber, For the middle frequency range, Main frequency range: 200 up to 3000 Hz, Middle frequency: 500 Hz, Material: external frame is constructed from clear lacquered 12 mm birch plywood, the perforated front panel is made from 9 mm birch plywood and is filled with mineral wool, For optimising the acoustics of hi-fi listening rooms, recording studios, post-production studios and conference rooms, Perforation diameter: 8 mm, Spacing between perforations: 16 mm, Hole volume: 1296 pc, Perforated area: 19.6%, Dimensions: 600 x 600 x 100 mm, Weight: 5.4 kg, Includes 4 mounting clips for wall mounting (screws are not included, must be purchased separately)