How can you keep up in the fast-moving music and sound industry?
How to de-ess to perfection (the hard way!)
Help! I have too much equipment. What can I do?
Q: Which is the best compressor and equalizer?
Before you do anything else, get the tempo right
Why distortion techniques MUST be part of your recording vocabulary
What is production? Part 3: Recording
Create an amazing trance riser in 7 steps
Q: I would like to try a summing mixer. Will my old Tascam do?
A microphone for the kick drum: Is the AKG D12 the only valid choice?
With regard to the comments made above, these are generally expensive in comparison with their acoustic worth.
They should only be used where flexibility or ease of installation is important.
They may also be used as damping material.
For instance a metal panel in a car may vibrate and transmit energy to the passenger compartment.
If it were damped, then not only would the vibration would be reduced, but significant energy would be taken out of the sound wave.