THE STUDIO JOURNAL / Test data
How to read an acoustic curtain test report
Find the fabric, test assembly, frequency bands and single-number ratings that make an acoustic report useful for specification.
THE SHORT ANSWER
Read the assembly before the rating: fabric, layers, fullness and mounting condition belong together.
The data, explained.
Swipe the diagram or table sideways to see all the detail ↔
| Report field | Recorded value |
|---|---|
| Layers | 1 |
| Fullness / cavity | 50% / 350 mm |
| Sample area / chamber volume | 9 m² / 300 m³ |
| Weighted absorption coefficient αw | 0.90 |
| NRC | 0.90 |
| Absorption class | A |
Original report dated 19 January 2019. αw and NRC are distinct ratings even when their numbers match. View the sources ↓
01 / THE DETAIL
Identify the specimen and its arrangement
Start with the precise product and sample construction. A report may describe one layer, a particular pleat arrangement and a specific mounting method. A similar product name or an added lining does not establish that your new assembly is covered.
The example here is a single-layer Acoustic Molton specimen. Save the source report with the project specification so the fullness, cavity and product reference can be checked again when ordering.
02 / THE DETAIL
Keep frequency data and ratings separate
Practical absorption coefficients describe particular frequency bands. Weighted absorption coefficient αw and NRC summarise performance using different methods. A class is another summary. These fields serve different purposes and should not be substituted for one another.
The manufacturer brochure also uses the label “SAC classification”. We retain that label in our tables instead of silently relabelling it as a frequency-band coefficient. Our frequency-response article shows the practical band values from this report.
03 / THE DETAIL
Check the method, date and source
This report states measurement generally to BS EN ISO 354:2003, practical coefficients and classification to BS EN ISO 11654:1997, and NRC to ASTM C 423-01. These are the editions identified in this particular source; the article is not a statement that they are the current editions for every new project.
A report upload date may differ from the actual test date. Read the document itself, keep its identifying sheet or test reference and ask for further evidence where the proposed assembly differs.
04 / THE DETAIL
Use the result within its scope
Do not interpret a Class A absorption result as a fire classification or a sound-isolation guarantee. In a room estimate, use appropriate band data and realistic room inputs. Our dedicated testing section puts the source beside the result and our calculation methodology explains the model boundaries. A final design still needs the installed coverage, mounting and intended use.
Sources & further reading
Technical figures come from the linked manufacturer documents. Worked examples are Studio Curtains calculations with their assumptions shown. Product data and availability should be checked again when specifying.
YOUR NEXT STEP
Turn the detail into a specification.
Share your dimensions and intended use. Stock availability and the final order are confirmed by email.