п.п. и аз първо се обърках така .... между другото JBL са имали колона с такава визия на решетката
източник: LansingHeritageWolf had seen the use of foam plastic as coverings for microphones -- either as breath filters in the studio or as wind shields in outdoor applications. He reasoned that, if the plastic was sufficiently open to sound transmission at the very low sound pressure levels encountered in microphone use, it surely would be transparent enough for a loudspeaker grille. Investigation proved this to be the case. Reticulated or open-pore foam tested out as better than most conventional grille fabrics. Wolf has stated that, while he cannot be absolutely sure of this, it appears that the L100 was the first use of shaped foam as a loudspeaker grille material.
Methods for contouring and shaping foam were fairly sophisticated, even at that time, and a striking deep waffle-like pattern was quickly devised that lent itself to the available production methods. The question of color became the next stumbling block. The integrally-colored material options were all too dull and weak to be acceptable. Dyeing did not work well. Finally, someone in JBL's Manufacturing Division (probably Tony Pacheco, Manufacturing Manager) attempted the obvious: paint it. A compatible paint formulation was found and, with the viscosity carefully controlled, the openings in the foam did not fill during the spray process. This happy result made it economically feasible to offer the L100 with three grille color options.