t.akustik Spektrum D30 Diffusor, Acoustic Diffuser, Based on a quadratic residue order for the dispersion of sound reflections, Increases the perceived spatiality of small and medium-sized rooms, Well-suited for recording studios, theaters and hi-fi environments, Effective frequency range: 1000 - 6000 Hz, Material: Plywood birch, Dimensions: 600 x 600 x 100 mm, Weight: 8.05 kg, Includes 4 mounting clips for wall mounting (screws not included)