Accredited ASTM E90 - Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements. ISO/IEC 17025:2017 accredited through A2LA Certificate 4240.01
Accredited ASTM C423 - Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method. READ MORE ABOUT ASTM C423
Accredited ANSI/ASA S12.51/ISO 3741 - Determination of Sound Power Levels and Sound Energy Levels of Noise Sources Using Sound Pressure – Precision methods for reverberation test rooms
ISO/IEC 17025 Accreditation assures that your test results will be recognized and trusted by your clients and customers around the globe. A2LA is a signatory to the International Laboratory Accreditation Cooperation (ILAC) Mutual Recognition Arrangement (MRA) and the International Accreditation Forum (IAF) Multilateral Recognition Arrangement (MLA).
ISO 23351-1 Measurement of Speech Level Reduction of Furniture Ensembles and Enclosures. This new method of testing is used to analyze the acoustic properties of office furniture and work pods. READ MORE ABOUT ISO 23351-1
Sound Transmission Loss - Measures sound transmitted through walls, floors, windows, doors and other building elements. Results provide ⅓ octave band Transmission Loss (TL) and Sound Transmission Class (STC) numbers. Data is used by acousticians, architects and engineers to design and specify appropriate noise isolation between architectural spaces. ISO/IEC 17025 accredited through A2LA Certificate 4240.01
Sound Absorption - measures sound absorbed by a panel or screen. Provides ⅓ octave band absorption coefficients, Noise Reduction Coefficient (NRC), Sound Reduction Rating (SRR). Data is used by acousticians, architects and engineers to specify appropriate room finishes for acoustic control
Sound Power – Measures and quantifies the entire amount of sound energy produced by a device. Sound power, unlike sound pressure data, allows apples-to-apples comparisons of sound data between machines or devices that is not affected by microphone set-up or distance. Sound Power data is used by acousticians and engineers to compare devices or to determine the acoustical impact a device or machine will have in a specific environment
Customized Sound Pressure and Sound Power Tests - NOAL can create custom test procedures and specifications to meet the acoustic measurement needs of any specific job or situation
Accredited ASTM E336 - Standard Test Method for Measurement of Airborne Sound Attenuation between Rooms in Buildings. ISO/IEC 17025:2017 accredited through A2LA Certificate 4240.01
Accredited ASTM E1007 - Standard Test Method for Field Measurement of Tapping Machine Impact Sound Transmission Through Floor-Ceiling Assemblies and Associated Support Structures
ISO 9614 - Acoustics -- Determination of Sound Power Levels of Noise Sources Using Sound Intensity. Part 1: Measurement at discrete points. Part 2: Measurement by scanning. Part 3: Precision Method for measurement by scanning
AHRI Standard 230 - Sound Intensity Testing Procedure for Determining Sound Power of HVAC Equipment
E966 - Field Measurements of Airborne Sound Attenuation of Building Façade and Façade Elements
Field Sound Power testing of equipment using sound intensity methods
Reverberation Time (RT60) - Measurement of reverberation times (RT60) to diagnose and determine acoustic treatment quantities and placement. Reverberation time (RT60) is the most commonly measured and specified metric for describing room acoustic character
Background Noise / Noise Criteria - Measurement of background noise levels for determination of Noise Criteria (NC) and other mechanical and background noise-related ratings. NC is the most common metric for describing the background noise levels in an architectural space
Building Facades - Measurement of building facades and roof/ceiling structures for sound transmission loss. Provide Outdoor Indoor Transmission Class (OITC) ratings
Sound and Structural Flanking Investigations - Use advanced techniques to diagnose sound transmission problems and flanking paths in buildings.
Environmental Noise Studies – Whether for compliance with community noise regulations or for environmental impact or suitability studies, NOAL can design and implement an on-site environmental acoustical measurement. Typically, environmental acoustic evaluation includes the measurement of statistical noise levels such as L10, L50 and L90
Studio Acoustics /
Audio Systems Field Testing
Services by Type
Frequency Response – Measure and tune rooms and/or audio systems for optimized response. Systems for Auditoria for music or speech can be optimized for response. Studio control rooms can be adjusted with broad or tuned absorbers, diffusion and proper monitor / listener arrangements
Speech Intelligibility - Measure and diagnose multiple room acoustic parameters including Speech Transmission Index (STI), Rapid Speech Transmission Index (RASTI), Articulation Loss of Consonants (%ALONS), and Clarity (C50)
Building Commissioning (Cx)
Acoustic field testing for compliance with LEED or WBDG or FGI or UFC requirements, including room noise, mechanical/HVAC noise, room isolation, speech privacy, and building envelope commissioning (BECx) sound transmission tests (ASTM E2813 / ASTM E966).
Field vibration testing from machinery for human comfort or disruption to vibration-sensitive equipment such as medical imaging equipment or precision manufacturing. Testing vibration propagation paths through a building structure for vibration transmissibility/mobility/compliance. Preconstruction testing for site acceptance of ambient vibration.
Rail Noise or Vibration Testing
Rail-vehicle pass-by noise and vibration emission testing. On-board or in-cabin noise and vibration field testing.
Acoustic Room Design
Whether the room exists (yet) or not, NOAL is capable of modeling room acoustics and providing recommendations for room dimensions and shapes, as well as exact finishes, treatment types and locations to provide an optimized acoustic experience in line with the use of the space. From small studio control rooms to meeting rooms, lecture rooms and large concert halls, NOAL is equipped to provide the required acoustic design expertise to ensure the success of the project.
Noise Isolation Design
Whether its designing a room from scratch, or diagnosing and providing remedies for existing rooms, NOAL has the tools and knowledge to provide state-of-the-art airborne and structure-borne isolation diagnostics and designs. Decades of experience with real-world problems and solutions for clients and architects. Common consulting and design areas include multi-housing units, incompatible commercial adjacencies, machine or mechanical room isolation, and manufacturing facility noise, etc.
Building Commissioning (Cx)
Acoustic testing for compliance with LEED or WBDG or FGI or UFC requirements, including room noise, mechanical/HVAC noise, room isolation, speech privacy, and building envelope commissioning (BECx).
HVAC Noise and Rooftop Equipment Noise
Measurement and diagnosis of HVAC noise and vibration, its effect on room noise (Noise Criteria or NC). Also capable of measuring in-situ sound power of roof-top equipment or measuring and remediating environmental noise levels at adjacent properties or areas.
Audio System Design
NOAL staff has decades of experience designing, specifying and using audio systems of all sizes and types. High-quality, high-intelligibility system designs for meeting rooms, sanctuaries, convention centers and auditoria. As musicians on the side, we have the unique advantage of encountering all sides of the acoustic and audio system experience.
Groundborne vibration propagation testing is the measurement of vibration as it travels through the ground from a vibration source to a vibration-sensitive receptor. NOAL can perform preconstruction testing for site acceptance of groundborne vibration.
Vibration testing from machinery for human comfort or disruption to vibration-sensitive equipment such as medical imaging equipment or precision manufacturing. Testing vibration propagation paths through a building structure for vibration transmissibility/mobility/compliance. Preconstruction testing for site acceptance of ambient vibration.
Rail Noise or Vibration Testing
Rail-vehicle pass-by noise and vibration emission testing. On-board or in-cabin noise and vibration testing.
We provide acoustical testing as well as acoustic research, design and consulting.