BS EN ISO 354:2003 Testing...the individual items in accordance with BS EN 354:2003, as shown in Figure 4 and Figure 5 respectively. For test 3 the three test items were placed around

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BS EN ISO 354:2003 Testing

Carried out for

Cinema Acoustic Treatment Systems Ltd

Report 100241/1

Compiled by Calum Maclean

3 March 2020

Page 2 of 19 Report 100241/1

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BS EN ISO 354:2003 Testing

Carried out for: Cinema Acoustic Treatment Systems Ltd

272 Bath Street Glasgow G2 4JR

Contract: Report 100241/1 Issued by: BSRIA Limited Old Bracknell Lane West Bracknell Berkshire RG12 7AH UK Telephone: +44 (0)1344 465600 Fax: +44 (0)1344 465626 Email: [email protected] Website: www.bsria.co.uk

QUALITY ASSURANCE

Issue Date Compiled by: Approved by: Signature

Final 03-Mar-2020 Calum Maclean Tom Garrigan

Senior Research Engineer

Business Manager

DISCLAIMER This Document must not be reproduced except in full without the written approval of an executive director of BSRIA. It is only intended to be used within the context described in the text. This Document has been prepared by BSRIA Limited, with reasonable skill, care and diligence in accordance with BSRIA’s Quality Assurance and within the scope of our Terms and Conditions of Business. This Document is confidential to the client and we accept no responsibility of whatsoever nature to third parties to whom this report, or any part thereof, is made known. Any such party relies on the Document at its own risk.

mailto:[email protected]

BS EN ISO 354:2003 TESTING CONTENTS


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CONTENTS

1 INTRODUCTION ............................................................................................................................. 5

2 ITEMS RECEIVED FOR TEST ........................................................................................................... 5

3 METHODOLOGY ............................................................................................................................ 7

4 RESULTS ...................................................................................................................................... 13

FIGURES

Figure 1 CATS Reflection Control Panel............................................................................................ 5 Figure 2 CATS Reverberation Control Panel 50 ................................................................................ 6 Figure 3 CATS Resonance Control Panel .......................................................................................... 6 Figure 4 Test 1 configuration............................................................................................................ 8 Figure 5 Test 2 configuration............................................................................................................ 8 Figure 6 Test 3 configuration............................................................................................................ 9 Figure 7 Test 4 configuration............................................................................................................ 9 Figure 8 Test 5 configuration.......................................................................................................... 10 Figure 9 Test 6 configuration.......................................................................................................... 10 Figure 10 Test 7 configuration ......................................................................................................... 11 Figure 11 Test 8 configuration ......................................................................................................... 11

TABLES

Table 1 Items received for test ....................................................................................................... 5 Table 2 Configurations tested ......................................................................................................... 7 Table 3 Calibration details for instrumentation ............................................................................ 12 Table 4 Equivalent sound absorption areas per object, Aobj ......................................................... 13 Table 5 Sound absorption coefficients of sample, αs .................................................................... 14

APPENDICES

APPENDIX A: Calibration certificates .............................................................................................. 15

BS EN ISO 354:2003 TESTING CINEMA ACOUSTIC TREATMENT SYSTEMS LTD


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1 INTRODUCTION

Cinema Acoustic Treatment Systems Ltd commissioned BSRIA to carry out sound absorption testing on 3 materials in 8 different configurations in accordance with BS EN ISO 354:2003 in order to determine the sound absorption coefficient of each material configuration. This report details the test method and the results obtained. Tests were carried out at BSRIA’s thermal acoustic test facility located in Bracknell, Berkshire on 24 July 2019. The installation configurations for each sample were agreed by Cinema Acoustic Treatment Systems Ltd. The test method used to determine the sound absorption coefficients was taken from BS EN ISO 354:2003 “Acoustics – Measurement of sound absorption in a reverberation room”.

2 ITEMS RECEIVED FOR TEST

Cinema Acoustic Treatment Systems Ltd supplied 3 material types for testing, as detailed in Table 1 and shown in Figures 1 to 3. Table 1 Items received for test

Test item number Description of item Size of individual items

1 CATS Reflection Control Panel or CATS-REF-

CP 300 x 300 x 50mm

2 CATS Reverberation Control Panel 50 or

CATS-REV-CP-50 300 x 300 x 50mm

3 CATS Resonance Control Panel or CATS-RES-

CP 600 x 600 x 50mm

Figure 1 CATS Reflection Control Panel



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Figure 2 CATS Reverberation Control Panel 50

Figure 3 CATS Resonance Control Panel



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3 METHODOLOGY

The objective of the sound absorption testing was to determine the sound absorption coefficients of the three material samples in the configurations given in Table 2. Table 2 Configurations tested

Test number Test item number

used Test description – Configuration

Number of items/area of sample

Test 1 CATS-REF-RP

1 Discrete sound absorbers – Individual items

around room 6

Test 2 CATS-REV-CP-50


around room 6

Test 3 CATS-RES-CP


around room 3

Test 4 CATS-RES-CP

3 Discrete sound absorbers – In corners against

2 walls 3

Test 5 CATS-RES-CP

3 Discrete sound absorbers – In room edges –

against 1 wall 3

Test 6 CATS-REF-CP

1 Plane absorber – centre of room in 4 by 4

configuration 1.44 m²

Test 7 CATS-REV-CP-50



Test 8 CATS-RES-CP



A 210m3 reverberation chamber was used to carry out the acoustic testing and the instrumentation was installed as needed in the chamber. Each sample was positioned in the chamber in accordance with the configurations given in Table 2. The configurations used in tests 1 to 3 were standard configurations as detailed in BS EN ISO 354:2003. The configurations used in tests 4 and 5 configurations were bespoke and representative of how Cinema Acoustic Treatment Systems Ltd would install the material in real life. The configurations used in tests 6 to 8 were run at the request of Cinema Acoustic Treatment Systems Ltd with the same coverage of 1.44m². For all tests the materials were positioned directly onto the floor of the chamber with no fixings between the tiles and the sample edges were left exposed. For tests 1 and 2 the 6 tiles were placed around the chamber with the required distances between the individual items in accordance with BS EN 354:2003, as shown in Figure 4 and Figure 5 respectively. For test 3 the three test items were placed around the chamber with the required distances between individual items in accordance with BS EN 354:2003, as shown in Figure 6. For test 4 the three tiles were placed in three of the corners of the room, as shown in Figure 7. Test 5 used 3 test items placed flush with the wall and at least 1m from any other wall, as shown in Figure 8. Tests 6 and 7 each used 16 tiles arranged in a 4 by 4 arrangement in the centre of the room, as shown in Figure 9 and Figure 10 respectively. The test 8 configuration used 4 tiles arranged in a 2 by 2 arrangement, as shown in Figure 11. Tests 4, 6 and 7 were chosen by the Manufacturer to most closely match the intended use of the panels.



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Figure 4 Test 1 configuration




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Note: a third test item is in the corner not shown on the Right



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Note: a third test item is against the wall to the left of the picture




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Six discrete microphone positions and two loudspeaker positions were selected in accordance with BS EN ISO 354:2003. A Nor850 Distributed Multi-Channel System with built-in signal generator were utilised to determine the reverberation times for the specific test environments. This arrangement was capable of producing sound pressure levels at least 10dB higher than the ambient sound pressure levels in each frequency band of interest. The microphones were calibrated before and after the measurement period. The barometric pressure, ambient air dry bulb temperature and relative humidity were measured for each configuration setup. Table 3 provides calibration details for the instrumentation. Table 3 Calibration details for instrumentation

The sound absorption coefficients were determined for one-third octave bands between 100Hz and 5kHz. The flush and 50mm rear gap configurations were considered plane absorbers and the results are expressed as sound absorption coefficients, αs. The across room corner configurations were considered discrete absorbers and the results are given as the equivalent sound absorption area per object, Aobj

Instrument Manufacturer Range Units BSRIA I.D. Calibration

Due

Digital Barometer Vaisala 5-110 kPa 881 10-01-20

Temperature and humidity meter Vaisala -10 +100

10-80

°C

% 1734 27-09-19

Nor850 Distributed Multi-channel System

Norsonic 0-130 dB 1400 25-10-19

Microphones & pre-amplifiers Norsonic 0-130 dB 1401-1406 25-10-19

Acoustic calibrator Nor1251 Norsonic 114 dB 1407 25-10-19

Power amplifier Nor280 Norsonic -35 + 0 dB 1408 N/A

Hemi-dodecahedron loudspeaker Nor275

Norsonic 0-120 dB 1409 N/A



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4 RESULTS

The calculated equivalent sound absorption area per object and sound absorption coefficients are given in Table 4 and Table 5 respectively. Table 4 Equivalent sound absorption areas per object, Aobj

One-third octave band centre

frequency (Hz) Test 1 Test 2 Test 3 Test 4 Test 5

100 0.01 0.04 0.11 0.37 0.20

125 0.00 0.03 0.19 0.47 0.35

160 -0.02 0.01 0.15 0.31 0.30

200 0.00 0.03 0.16 0.35 0.29

250 0.02 0.06 0.15 0.35 0.28

315 0.02 0.06 0.24 0.35 0.26

400 0.05 0.08 0.29 0.30 0.33

500 0.09 0.10 0.30 0.36 0.30

630 0.04 0.14 0.31 0.29 0.30

800 0.02 0.16 0.32 0.28 0.29

1000 0.01 0.17 0.32 0.23 0.28

1250 0.00 0.16 0.27 0.23 0.25

1600 0.01 0.18 0.29 0.22 0.21

2000 -0.01 0.16 0.26 0.14 0.18

2500 0.00 0.16 0.20 0.09 0.14

3150 0.01 0.18 0.24 0.11 0.16

4000 0.01 0.17 0.18 0.13 0.15

5000 0.01 0.19 0.20 0.17 0.14

Note 1: The determined equivalent sound absorption areas per object, Aobj, are only valid for the configuration setup used during testing



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Table 5 Sound absorption coefficients of sample, αs

One-third octave band centre frequency (Hz)

Test 6 Test 7 Test 8

100 -0.01 0.14 0.46

125 0.07 0.41 0.48

160 -0.04 0.19 0.41

200 0.07 0.32 0.44

250 0.24 0.50 0.48

315 0.30 0.70 0.54

400 0.52 0.72 0.58

500 0.70 0.88 0.55

630 0.39 1.04 0.57

800 0.15 1.05 0.49

1000 0.11 1.11 0.47

1250 0.10 1.11 0.42

1600 0.11 1.08 0.46

2000 -0.01 1.10 0.38

2500 0.03 1.02 0.32

3150 0.05 1.14 0.25

4000 0.06 1.11 0.21

5000 0.17 1.29 0.31

Note 1: The sound absorption coefficient evaluated from reverberation time measurements can have values larger than 1.0 (e.g. because of diffraction effects), and αs is not, therefore expressed as a percentage. Note 2: The use of the subscript “s” is to avoid confusion with the sound absorption coefficient defined as the ratio of non-reflected-to-incident sound energy if a plane wave strikes a plane wall at a particular angle of incidence. A “geometric” sound absorption coefficient is always smaller than 1.0 and may therefore be expressed as a percentage.



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APPENDIX A: CALIBRATION CERTIFICATES



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BS EN ISO 354:2003 Testing...the individual items in accordance with BS EN 354:2003, as shown in Figure 4 and Figure 5 respectively. For test 3 the three test items were placed around