A 400 lb duct is to be hung from a ceiling. 30 dB of isolation is desired at all frequencies greater than 100 Hz. Determine the desired stiffness, and static deflection of each isolator spring if four springs are to be used. Note we have no damping and we can assume all four springs are equally loaded. In addition, dB = 10 log10 (1/Rd). Determine the percent isolation.

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