Measurement Report
BuzziBassTrap
CONTENTS
1. The reverberation room
2. The measuring equipment
3. The measuring standards
4. The measuring method
5. Product description
6. The measuring conditions
7.Results
SUMMARY
BuzziTrap Quatro
absorp9on coefficient αobj 8.00 7.00 6.00 5.00 4.00 3.00 2.00 8000 10000 6300 5000 4000 3150 2500 2000 1600 1250 800 1000 630 500 315 400 250 200 125 160 0.00 100 1.00 Equivalent sound absorption surface for an individual object in m2
BuzziTrap Sono
BuzziTrap Duo
Hz
αobj [m2]
Hz
αobj [m2]
125
250
500
1000
2000
4000
0.83
0.56
1.23
0.41
0.22
0.40
125
250
500
1000
2000
4000
1.65
1.12
2.45
0.82
0.43
0.80
BuzziTrap Trio
BuzziTrap Quatro
Hz
αobj [m2]
Hz
αobj [m2]
125
250
500
1000
2000
4000
1.75
1.21
3.48
1.20
1.10
1.67
125
250
500
1000
2000
4000
4.28
2.86
5.17
1.67
0.25
0.96
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanic,
photocopying, recording, or otherwise, without the prior written permission of the publisher. BuzziLabs is not responsible for the measurement results.
1. THE REVERBERATION ROOM
The BuzziLabs reverberation room:
A diffuse field is created in this room using 188 QRD diffusers so that the absorption range
of the product can be accurately determined. This room contains a fixed set-up for the
speaker and the three positions for the microphone.
Reverberation room dimensions (in mm): 5818 (l) x 3716 (b) x 2965 (h)
Capacity of reverberation room minus the total volume of the diffusers (in m³): 64
2. THE MEASURING EQUIPMENT
The following equipment is used to take the measurements:
•
•
•
•
•
Fuzz measure acoustic measurement software
Beyer Dynamic MM1 microphone
Motu Microbook II sound card
BuzziLabs reverberation room
Spherical speaker type Mx 12
Measuring instrument class 1 NTI acoustics
3. THE MEASURING STANDARDS
The measurements are taken and the calculations are made in accordance with the guidelines in the following standards:
NEN-ISO 354 Acoustics – Measurement of sound absorption in a reverberation room
NEN-EN-ISO 11654
Acoustics – Sound absorbers for use in buildings. Rating of sound absorption
ASTM-C324-90a
Standard Test Method for sound absorption and sound absorption coefficients by the reverberation room method
4. THE MEASURING METHOD
To determine the absorption coefficient, the method laid down in standard NEN-EN-ISO 354:2003 Acoustics – Measurement of sound absorption
in a reverberation room is used.
The measurement concept is as follows: the reverberation time of the reverberation room is measured without test objects. After this, the reverberation time of the room
is measured with the products or materials to be tested. On the basis of the difference in reverberation time, measured in third-octave bands, and the surface area of the
product, it is possible to calculate the absorption value of the product to be tested at the requested frequency.
The following comparison is used for this calculation:
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanic,
photocopying, recording, or otherwise, without the prior written permission of the publisher. BuzziLabs is not responsible for the measurement results.
A1 = ((55.3 × V) / c × T1) – 4Vm1 [m2]
Where:
V = volume of the empty reverberation room [m3]
T1 = reverberation time in the empty reverberation room [sec]
m1 = power attenuation coefficient in the reverberation room in accordance with: m = α /(10- lg (e)) [m-1]
where α = attenuation coefficient calculated in accordance with ISO-9613-1
c
= speed of the sound in accordance with: c = 331 + 0.6t [m/s]
where t = temperature in degrees Celsius
This is repeated with the product to be tested in the reverberation room in accordance with:
A2 = ((55.3 × V) / c × T2) – 4Vm2 [m2]
Where:
V = volume of the empty reverberation room [m3]
T2 = reverberation time in the reverberation room with the object [sec]
m2 = power attenuation coefficient in the reverberation room in accordance with: m = α /(10- lg (e)) [m-1]
where α = attenuation coefficient calculated in accordance with ISO-9613-1
c = speed of the sound in accordance with: c = 331 + 0.6t [m/s]
where t = temperature in degrees Celsius
Owing to the irregular volume of the BuzziLabs reverberation room, the length of the signal path is limited, which means that the power attenuation coefficient
is negligible. The formula will therefore be rewritten as:
A = ((55.3 × V) / c × T)
The total sound absorbing surface area A is calculated by:
A = A2-A1
=
A = ((55.3 × V) / c × T2) - ((55.3 × V) / c × T1)
The absorption coefficient can be calculated by:
α=A/S
Where S [m2] is the total product surface area.
5. PRODUCT DESCRIPTION
The sound absorption measurements are carried out for the following product:
Name:BuzziBassTrap
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanic,
photocopying, recording, or otherwise, without the prior written permission of the publisher. BuzziLabs is not responsible for the measurement results.
6. THE MEASURING CONDITIONS
The following conditions are observed in the rooms when the measurements are taken:
BuzziLabs reverberation room
Temperature
17 °Celsius
Air pressure
1011 hPa
Background noise
28 dBA
7. RESULTS
The results measured are given in third-octave bands. The octave bands are calculated by taking the average of the thirdoctave bands per octave band.
The results measured are given in third-octave bands. The octave bands are calculated by taking the average of the third-octave bands per octave band.
7. RESULTS
The NRC value is calculated in accordance with ASTM-C324-90a and the α w in accordance with ISO 11654.
The absorption coefficients obtained may not be seen as a material property.
The absorption coefficients obtained may not be seen as a material property.
The way in which the material is attached, among other things, influences the absorption coefficient to be obtained.
The NRC value is calculated in accordance with ASTM-C324-90a and the αw in accordance with ISO 11654.
The way in which the material is attached, among other things, influences the absorption coefficient to be obtained.
80
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
6300
8000
10000
12500
1.14
0.78
0.83
0.87
0.73
0.43
0.52
0.99
1.26
1.43
0.62
0.41
0.21
0.14
0.18
0.33
0.34
0.39
0.46
0.46
0.30
0.34
0.32
0.01
0.90
0.83
0.56
1.23
0.41
0.22
0.40
0.37
1.40
1.65
1.12
2.45
0.82
0.43
0.80
0.73
0.02
0.00
0.00
0.61
2.64
80
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
6300
8000
10000
12500
2.53
2.46
1.85
0.95
1.05
0.37
2.19
3.52
4.20
2.72
2.20
0.40
1.01
1.13
1.17
1.01
1.67
1.69
1.65
1.11
1.43
1.83
2.11
0.01
1.93
1.75
1.21
3.48
1.20
1.10
1.67
1.45
25
31.5
40
50
63
0.04
0.00
0.35
2.01
4.27
80
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
6300
8000
10000
12500
5.88
7.00
3.31
2.54
1.88
2.55
4.15
5.31
6.61
3.58
2.32
1.50
1.19
0.55
0.00
0.20
0.50
0.90
1.46
1.74
2.38
2.43
2.11
αobj [m2]
αobj1/3
frequency
1.58
1.60
1.80
1.54
1.03
0.37
1.96
2.20
2.52
2.62
1.34
0.40
0.71
0.19
0.68
0.42
0.74
0.83
0.82
0.65
0.74
0.79
0.78
25
31.5
40
50
63
αobj [m2]
80
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
6300
8000
10000
12500
0.01
αobj1/3
0.02
0.00
0.00
1.24
1.37
Quatro
frequency
25
31.5
40
50
63
αobj [m2]
αobj1/3
0.02
0.00
0.00
0.61
0.94
Trio
frequency
25
31.5
40
50
63
α obj [m 2]
α obj 1/3
Duoo
frequency
Solo
0.13
4.05
4.28
2.86
5.17
1.67
0.25
0.96
2.18
BUZZISPACE HQ
Groeningenlei 141-143 | B-2550 Antwerp-Kontich
T +32 3 846 10 00 | F +32 3 846 10 01
buzzispace.com
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanic,
photocopying, recording, or otherwise, without the prior written permission of the publisher. BuzziLabs is not responsible for the measurement results.
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