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The human ear responds to sounds in the range of 20 Hz to 20 kHz but is most sensitive in the 1,000-5,000 Hz band with a peak around 4,000 Hz. The auditory canal alone has a closed-tube resonance of 2,000-5,000 Hz.
For a production boat it’s feasible to do a spectrum analysis and design suitable sound attenuation and test it. For a bespoke boat this is unlikely to be feasible. Thus a good cost-effective approach is to focus on reducing sound transmission , in a target range for engine noise such as 1,000-2,500 Hz (wavelengths of 13.5 to 5.4 in or 34.3 to 13.72 cm).
== Methods of Isolation ==
