Acoustically insulated apparatus

摘要

An acoustically insulated apparatus is disclosed which includes a machine and an acoustical insulation system for the machine, wherein the machine generates noise having a peak sound frequency. The insulation system includes a two-part stratum having a porous sound absorbing media layer, and a sound reflecting barrier layer located between the sound absorbing layer and the machine, wherein the two-part stratum exhibits maximum sound absorption at the peak sound frequency.