Return to: Multiroom Audio Deep Dive Reveals Drop in Number of Zones, Prices Previous Slide Next Slide Dealers report that on average 16% of their projects include an “invisible” speaker with either a small aperture or hidden beneath a coat of plaster. Nearly 2% of dealers say every project they do has at least one of these low-profile speakers. Return To: Multiroom Audio Deep Dive Reveals Drop in Number of Zones, Prices