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Originally Posted by jasedee
egg cartons do absolutely nothing, except maybe diffuse extremely high frequencies, which dont cause resonance in rooms anyways as they are higher than the rooms critical frequency.
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The superlon + egg carton absorb the high reflections of the room so the room is a bit more damped. Of course you can't get a complete sound insulation with that system (neither you can with acusto plates). But who actually needs a cannon sound proof recording space (unless someone shoots regulary with a cannon next door).