Accurately evaluate your product’s sound absorption and transmission performance with diffuse field acoustic testing. At Mecanum, we measure NRC, SAA, and STC acoustic ratings using internationally recognized methods to help you optimize materials and components for real-world acoustic environments.
✓ NRC (Noise Reduction Coefficient)
✓ SAA (Sound Absorption Average)
✓ STC (Sound Transmission Class)
All tests are conducted under diffuse field conditions, capturing the full acoustic behavior of your materials.
Why These Measurements Matter
Whether you’re developing insulation panels, automotive parts, or construction systems, understanding how your product behaves acoustically is crucial.
✓ NRC and SAA ratings are derived from the 1/3-octave sound absorption curve under diffuse field conditions.
✓ STC is calculated from Sound Transmission Loss (TL) 1/3-octave spectra, a key factor in evaluating how well your material blocks airborne sound.
These ratings provide a clear benchmark for comparing materials, guiding both design and compliance decisions.
Standards & Compliance
We follow internationally recognized standards to ensure your results are consistent, reproducible, and ready for certification.
Sound Absorption Testing
✓ Standards: ASTM C423, ISO 11654, SAE J2883
✓ Ratings: NRC, SAA
Sound Transmission Loss Testing
✓ Standards: ASTM E2249, ISO 15186-1, SAE J1400, SAE J2846
✓ Ratings: STC
Choose the Right Test Environment
Large Chamber
✓ Full compliance with ISO and ASTM international standards
✓ Suitable for large-format samples
✓ Highly accurate
✓ Requires longer lead times and higher budgets
Small Acoustic Test Cabin (Alpha Cabin)
✓ Compact, cost-effective solution for smaller samples
✓ Ideal for prototype testing and R&D phases
✓ Particularly well-suited to automotive applications
✓ Covers frequencies from 250 Hz to 10 000 Hz
Why Choose Mecanum for your NRC, SAA and STC Testing Under Diffuse Field Conditions?
With over 25 years of experience, Mecanum supports leading manufacturers in the automotive, aerospace, and building industries. Our in-house labs and expert team deliver dependable acoustic testing, from early development to final validation.
Ensure your materials meet global acoustic standards—with precision you can rely on.