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YGM Acoustic Pyramid Foams which are 1' squares of 2 thick acoustical foam and are a great solution for spot treating sound studios, home listening

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2X36X72 - Charcoal Acoustic Foam Sound Absorption Pyramid Studio Tr

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Home Insulation Absorbing Foam 12 Pack, Studio Acoustic Treatment Flame Retardant Noise Insulation For Walls, Pyramid Sound Wall - AliExpress

Therefore, they does an excellent job in absorbing flutter echoes, reverberation and standing waves.

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