Vibration Dampening All cabinet walls are constructed of two five-eighths-inch-thick MDF wood panels glued together with a rare and costly viseolastic vibration dampening material used within the floorboards of fine European trains. This material greatly diminishes vibrations that emerge from the inside of the speaker and move outward through the external walls. The result is a speaker cabinet which provides ten times the vibration dampening properties of untreated wood.