Deadener n. : One who, or that which, deadens or checks.

Example:
I built a sealed subwoofer enclosure, can I use sound Deadener to seal the terminal?

Taxonomy
vehicle, panel, products, noise, vibration damper, Sound Deadener, resonance, vibration dampers, layer, Showdown, vibration, job, the noise, sheet metal, truck, acoustics, car, sound deadening.

Defination from the web:
... Sound Deadener" is a vague term that describes a range of materials and techniques. ...