ako-sutexikkukontoro-rusi-to changes (high performance sound absorption material) ● Sound Absorption Properties To Control Chip. Speaker Frequency to match the sound absorption and sound absorption rate adjustable to release the control chip, sound absorption frequency control and sound absorption rate available ● Reduces unwanted sound reflections on your vocal band to better effect with EPDM system High performance sound absorption material adopt ● handy size: 200 mm × 200 mm, Thickness 15 mm