"Do you want tires with that car?" is a phrase that translates well to the acoustical panel business. Ask what is included. Are edges square or shaped? Are they hardened? Is mounting hardware included? How are they packed: cardboard carton or wooden crate? What does freight cost? For acoustical panels, the package often weighs more than the product, especially with cellular Melamine (foam) panels. This can bring about the specter of the dreaded "dimensional weight," where freight is charged by volume rather than by weight. By personal experience, I've found it painful to learn that someone has shipped a box of lightweight foam by air at a shipping cost greater than the value of the product.
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Here is a sampling of the panel choices available:
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POP. The "Plain Old Panel" made of a fabric covering over a sound-absorbing, high-density fiberglass board. The fabric covering is acoustically transparent. There are other variations with at least one manufacturer using mineral fiber (mineral wool) in place of fiberglass. The fiberglass board is often mistakenly called "703," the model number for one supplier's original acoustical fiberglass. The original "703" fiberglass boards were of lower density than commonly used today. Most fiberglass board used in acoustical panels is six to seven pounds per cubic foot.
Flat diffusion panel. POP with a membrane below the fabric surface. The membrane has a pattern of holes that varies reflection and absorption over the panel surface. The result is a scattering effect of the sound. This is an interesting item for a confined space but less necessary for a sanctuary where a traditional diffuser can be used to greater advantage for sound and, with custom wood finishes, for appearance as well.
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- Barrier sandwich. Two POPs with a layer of heavy vinyl in between to block sound passing through the acoustical panels. (Absorbing panels prevent sound reflection but do little to block penetration through walls from room to room or inside to outside.) This item has been used to replace composite foams in machinery enclosures. The barrier sandwich can be made into a removable insert for framed glass partitions to provide additional isolation when conflicting events are on opposite sides of the window. For permanent installations, standard panels with separately supplied barrier may be more effective for sound and budget.