Correct term is "damping". Damping reduces resonances, dampening wets something. I'm pretty sure you'd never want to wet the insides of your speakers...
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Anyone Damp the insides of your Speaker Cabinets?
Do most speakers sound best in cabinets that resonate as little as possible? Why or why not? Is there something any of you have applied to the inside of your speaker cabinets to keep them from resonating, and achieved a more pleasing sounding speaker?