There is no single acoustic panel thickness that suits every room. An office, studio, home theater, classroom, restaurant, and equipment room can all have different noise sources, room volumes, surfaces, occupancy patterns, and performance priorities.

The difference between a 9mm and 12mm PET acoustic panel looks small on a drawing, but it can influence weight, edge profile, handling, design expression, and sound-absorption potential. Neither dimension is universally “right.”

Yes, acoustic panel thickness matters, but it is not a shortcut to a meaningful acoustic specification. Thickness affects how much porous material is available for sound to travel through, which can change the frequencies a panel absorbs most effectively. Yet thickness cannot be read in isolation.