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The purple Auralex SonoFlat Grid Sound Absorption Panels 16-pack are designed for treating acoustic issues in a recording studio, listening room, or home theater. The panels are constructed of melamine-free studio foam and provide absorption of high, mid, and some low frequencies. Placing the panels on the walls or ceilings can help reduce the amount of reverberation in a room, improve speech intelligibility, and manage the effects of flutter echo.