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Nonetheless, using some admissions and simplifications allows achieving acceptable practical result.
Let’s consider that a membrane with surface density m is fixed on a framing with depth d and they vibrate as an integral unit with no surface deformation.
In these cases, natural resonance of the room can extremely negatively affect the equipment’s sounding.
Correct mutual position of acoustic systems, enclosing constructions and listening zone can be an important tool to help reduce room resonance and achieve realistic sound stage.
That is why we call this type of absorber conversional.
Absorber is represented by a system mass-spring, due to which it has resonant frequency, which makes it work the most effective.
Resonant frequency of absorbing depends on slats cut, framing depth and insulation absorbing effectiveness.Find out more about this methodology from article "Placing loudspeakers in a rectangular room".Listener in the room perceives not only direct sound, emitted by acoustic systems, but its reflection off walls, ceiling and floor.Panel conversion absorber is quite popular means of acoustic treating for critical listening rooms due to its simple construction and rather wide range of absorbing diapason in the area of low frequencies.Panel absorber is represented by hard resonator-framing with enclosed air volume, which is hermetically covered with flexible and massive panel (membrane).