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Lots of mass (very low resonant frequency)

Low stiffness (very high co-incident frequency)

All materials have both a resonant and co-incident frequency, at which sound is transmitted more efficiently. Materials where these frequencies occur outside of the range of hearing (20 - 20,000 Hz) are better for sound proofing.

With lead, the resonant frequency is below 20Hz and the co-incident frequency is about 20,000Hz.

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