Membrane Absorber

A membrane absorber (also called a panel absorber or diaphragmatic absorber) is a non-rigid, impervious panel mounted over an enclosed air cavity. The panel vibrates in response to incident sound, converting acoustic energy to heat through internal damping and friction. The resonant frequency depends on the panel mass and cavity depth: heavier panels and deeper cavities resonate at lower frequencies. Membrane absorbers are effective at low frequencies where porous absorbers become impractical due to the thickness required. Typical applications include bass trapping in studios, low-frequency control in music venues, and broadband absorption when combined with porous fill in the cavity. Design variables include panel material (plywood, MDF, plasterboard), panel thickness, cavity depth, and damping material. They are valued for their ability to provide bass absorption without visible porous material.