Apple Inc.
COATING FOR IMPROVING LOUDSPEAKER SOUND QUALITY

Abstract:

Aspects are disclosed of an acoustically active coating. The coating is a highly porous coating having a thickness and including between 2% and 30% by mass of a binder and between 70% and 98% by mass of a zeolite. The coating comprises an irregular matrix formed by a plurality of convex shapes connected by concave connectors and has a distribution of pore sizes. Other embodiments are disclosed and claimed.