Acoustics and Noise Control
Acoustics and Noise Control are essential to successful listening and presentation environments, and are an integral part of the AV systems design process. We offer a variety of services which may be provided standalone or alongside an AV project:
Room Acoustics Design
Room Acoustics Design includes the establishment of appropriate acoustical criteria based on the space use, room shaping and room finish selections to achieve the necessary listening environment which may include speech and/or music and may or may not include electronic reinforcement, playback or enhancement systems.
Architectural Sound Isolation
The isolation of noise or acoustic content from one space to another is crucial for many types of facilities and applications. Isolation of music or speech from one space to another in educational, corporate or government facilities or the reduction of unwanted exterior or interior noise that may encroach on an auditorium or conference room are examples of the need for sound isolation design. Services include the development of noise criteria and development of recommendations for sound isolation such as wall constructions, floor/ceiling constructions and vibration control measures.
HVAC Noise and Vibration Control Design
One common source of noise in buildings is the HVAC system which can create excessive noise in any area of a building unless noise control is properly designed into the system. The best and most cost effective noise control designs start with equipment selection and locations, and may include analysis and recommendations for mechanical room equipment mounting, fan selection, duct configurations, duct silencer selection, and piping and equipment vibration isolation systems.
We also provide acoustical testing services for commissioning, construction submittals and verification. We can perform standard testing for field measurements including:
|ASTC Apparent Sound Transmission Class||RT60 Reverberation Time|
|FSTC Field Sound Transmission Class||NC Noise Criterion|
|NIC Noise Isolation Class||RC Room Criterion|
|NNIC Normalized Noise Isolation Class|
The sound isolation measurements in the left column are part of standardized procedures based on ASTM E336-07 and ASTM 413. Each is used for measuring sound isolation of wall, floor, and ceiling constructions in the field. The new ASTC measurement replaces the FSTC measurement in most cases, but the FSTC can still be performed under some circumstances where flanking around a test construction can be controlled. NIC provides a measurement that better reflects the perceived sound isolation between spaces. NNIC may be used in some cases in smaller, yet-to-be-furnished rooms for a more accurate representation of sound isolation in the finished spaces.
RT60 is a measurment of the decay time of sound in a room. Decay measurments can be compared to recommended averages for different types of spaces. The RT60 measurement is a part of the FSTC determination.
The NC and RC measurements are single-number background noise measurements often used in specifying equipment noise impacts or used as design goals for spaces. These measurements can be compared to standard ASHRAE recommendations for background noise levels.
Environmental Noise Evaluation and Control
Exterior noise created by processes or activities can adversely affect people nearby whether in their homes, in an office building or outdoors. Evaluation and analysis is needed to determine the levels and distribution of noise, the effects on people in the area, and measures required to reduce noise where necessary. Noise sources can include industrial sites, outdoor music facilities or transportation corridors.