I seriously doubt anything that thin and inexpensive is going to beneficially affect the resonant properties of your mdf shelving. That stuff is designed to dampen vibrations in metal air ducts, a completely different material and application. For damping the insides of components, get something designed for the job like this 3M material:
http://www.musicdirect.com/p-205-audio-additives-3m-damping-sheet.aspx
I have used material like this in cd players. If the cd player has inadequate damping and vibration control, it can (but might not) help to tighten the focus and resolution of playback.
http://www.musicdirect.com/p-205-audio-additives-3m-damping-sheet.aspx
I have used material like this in cd players. If the cd player has inadequate damping and vibration control, it can (but might not) help to tighten the focus and resolution of playback.