Is grille cloth truly acoustically transparent? If so would it still be transparent with 2 layers? The reason I want to use 2 layers is because I am installing focal krx3 midrange and tweets in my A-Pillars and the yellow cones are still visible through one layer of grille cloth. I want the install to look as stealth as possible and I do not want the cones visible to thieves. I am planning on attaching one solid piece of grille cloth to the entire A-Pillar with velcro and mounting the speakers mounted under the cloth.Can anybody recommend a high quality grille cloth that stretches good in all directions?