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→Some Cautions
* The performance of two mass panels isolated by a viscoelastic glue can exceed that of a limp mass, such as lead-loaded composite insulation. It may be feasible to use just ~R13 fibreglass with the mass panels.
* A triple mass-panel sandwich alone that consists of a mass panel glued (viscoelastic) to either side of a bulkhead can achieve attenuations of 60 dB.<ref>ibid</ref>
* Test (sound . Sound meters with a range of 35-130 dB can be rented.(or use an iPhone app):
** Start with a basic installation of isolation in the engine room. Run the engine and use a sound meter to measure the noise in adjacent cabin areas. Upgrade the isolation to reach your sound goal.
** Or, build a small test box with a logging sound meter inside. Add test isolation externally. Evaluate the performance of your choices by suspending the test box in the engine room and running the engine.