Unique Bargains - Speaker Sound-Absorbing Cotton Polyester Fiber 100x30x3cm Flame Retardant Acoustic Insulation DIY HIFI - White

Speaker sound-absorbing cotton is installed in the speaker to absorb standing waves from the low frequency of the cabinet. After installing the sound-absorbing cotton, it will make the bass clearer and stronger. It can be used for DIY subwoofer, speaker cabinets, and interior decoration and filling of car audio systems.