... conference rooms, television stations, studios, theaters, Opera Houses, hotels, multi-functional halls, concert halls, bars, restaurants, shopping malls, schools, auditoriums, ... High absorption spectrum , acoustic absorptivity>0.9 .2. Better effect for low ,middle.and high noise .3. fireproofing,no ... many colors can be for selection About the spongeLittle effect on the appearance of a sponge, but with ...