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What sort of difference? Acoustic? Mechanical? ....Is there any difference if I use the cutton/fabric or metal grills for this job?
Clearly the lower the ratio of material (cloth fibre / metal) to air the lower the sound attenuation.Is the hole size/hole diameters of the grils important too?
?? The grille is usually rectangular, hiding a circular speaker. It is the speaker size (diameter) which is the main determinant of the audio spectrum.Is'nt there any relationship between the grill diamtere and the wavelength/frequency of the ouput sound?