Environmental Noise Report · MCU13/0064

8 Appendix A – Stereo System Amplified Music Testing
An amplified music test was conducted for the Makepeace Island stereo system. The system
includes internal and external speakers. It was noted that most external speakers were dominated
by the internal music system during the testing. As such the noise levels referenced at 3 m from
these sources would be a proxy for the control of internal sources. However, the noise limits at 3 m
from external speakers are adequate and only additional testing would confirm the external
component.

During the testing intrusive noise was measured using the song entitled ‘Back in Black’ performed by
ACDC. The first minute of the song was used consistently during the testing. Reference source
testing points at 3 m from installed speakers are presented on Figure A.8.2 and Figure A.8.2. The
results of the testing are presented in Table A.8.1. The daytime evening limit was calculated by
taking a noise level goal of 40 dB(A) and applying the difference with the intrusive measurement to
the measured sound pressure levels at 3 m.

                           Table A.8.1: Stereo System Amplified Music Testing Summary
                    Hz                         63      125       250   500   1000   2000   dBLin   dB(C)   dB(A)
A        Normalisation Moderator             105       109       100   99     96     95      111     111     102
                                     S1      102       109       103   92     95     97      111     111     102
                                     S2        85       92       85    89     89     88       97      96      93
                                     S3        88      106       101   91     93     94      107     107      99

        Source L10 (3 m from          S4       72       76       71    70     73     69       80      80      76
B               source)               S5       72       74       68    64     65     64       78      77      70
         (A-B) (Moderator - Source
C                maximum)                       3        0        -3    7      1      -2
     Intrusive levels at worst affected
D                 site L10                     54       57       53    51     44     41
     (C+D) (Normalised intrusive level
E             at affected site)                57       57       50    58     45     39                       55
     Background at worst affected site
F                    L90                       36       35       21    18     17     13
G   (E-F) (Exceedance of Backgrounds)          22       22       29    40     28     27
      Maximum allowable Tolerance
      above background after 10 pm
H           11:15 pm 14/06/13                   8        8        8     8      8      8
I        Exceedance of Tolerance               14       14       21    32     20     19




0023-R1-01 KHA Makepeace Island Noise Impact Assessment Report                                                18
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