Soundproof Enclosures

Soundproof enclosures are frequently a great solution for noise problems. Below is a case study as well as pictures of soundproof enclosures from different client assignments using acoustical panels to provide a soundproofing solution.
Stringent community noise ordinances did not permit the acceptance of a containerized diesel power generator set which was installed by a major hospital. Community noise ordinances required that the generator could not increase noise levels by more than 10 dB higher than the ambient sound levels measured at the property line of the facility. Since ambient noise measured 50 dBA, the generator would need to emit no more than 65 dBA from a distance of about 20 feet. Prior tests indicated that the generator emitted more than 80 dBA of noise, requiring more than 15 dB of noise reduction, or a 65% reduction of perceived loudness level.
Sonic-Shield engineers visited the site, took acoustical and physical measurements, and examined the design of the existing generator enclosure. This review identified several areas where sound was escaping from the generator enclosure, through either “leaks” in the container or use of inadequate sound proofing materials. Several opportunities were identified to further reduce the noise, including the use of additional sound absorption beneath the container floor, acoustical close-out panels along container support structure, larger and more effective noise dampening baffles, and additional high-quality acoustical materials on the inside of the container. These recommendations were further complicated by the fact that the footprint or appearance of the container could not be altered from its as-delivered state.
Within two days, the required improvements were implemented on the container, resulting in a decrease in noise levels from over 80 dBA to about 64 dBA, which represents a 69% reduction in perceived noise levels. Sound levels measured at the property line found that the generator increased noise levels by only 8 dB more than the ambient noise, which enabled the hospital to easily comply with community noise ordinances.
Soundproof enclosures take many forms and sizes. Below are pictures of soundproof enclosures built around a motor.