The most cost effective way of mounting acoustic wall panels is through the use of impaling clips that are permanently mounted to the wall and then impaled into the back of the panel where they are locked into place with adhesive that wicks into and binds the glass fibers together. If by chance the wall mounted acoustic panels for any reason do have to be removed, careful removal will pull some of the fiberglass from the panel back. When relocating the panel, simply locate the impaling clips in a different location. Impaling clips provide a more cost-effective approach in both materials and labor to install the sound absorbing panels.
If acoustical panels are being used to reduce reverberation and background noise buildup that can interfere with speech intelligibility, the most cost-effective thickness is one inch. At 500 Hertz the absorption value of a 1″ thick panel is in the order of 90 to 95%, which is right in the voice frequency range. Since the absorption values are primarily based on thickness a 2″ thick panel should not necessarily be viewed as a better panel since the additional thickness only provides an additional 5-10% absorption in the voice frequency range.