studio acoustic treatment (thesis )
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1 0 0 54.6hz
0 0 1 56.9hz
Rec4 Rec5 Rec6 Rec7 Rec8 Rec9
53hz 10.5dB 8dB 8dB -1dB 8dB 3dB
54hz 9dB 8dB 8dB -1dB 9dB 3dB
55hz 9.5dB 8.5dB 8.5dB 0.5dB 9.5dB 3.5dB
56hz 13dB 9dB 11dB 1dB 12dB 5dB
57hz 12dB 12dB 12dB 1dB 12dB 7dB
Directional microphone measurements
Rec4 Rec9
53hz 2dB - 5.5dB
54hz 3dB - 4dB
55hz 3.5dB - 4dB
56hz 6dB - 2dB
57hz 7dB - 3.5dB
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3&6+'.$#1!@+($)$+#(!,+'!'++4!'&(+#>#6&(!&B@&'$4)!L!
!
!
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42#)/.-2/!+,0!@)/-2!A%23,#$#&B!
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!
E>!
!
!
!
=>/C&!L!
Length 3.15 m
Width 2.18 m
Height 3.02 m
Volume L*W*H = 20.73
!
=>/C&!A!
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42#)/.-2/!+,0!@)/-2!A%23,#$#&B!
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3++4!:+.&(!6>C60C>)$+#!
Modes
Eigen
frequencies
1 0 0 54.6hz Axial
0 0 1 56.9hz Axial
0 1 0 78.9hz Axial
1 0 1 78.9hz Tangential
1 1 0 96hz Tangential
0 1 1 97.3hz Tangential
2 0 0 109.2hz Axial
1 1 1 111.5hz Oblique
0 0 2 113.9hz Axial
2 0 1 123.1hz Tangential
1 0 2 126.3hz Tangential
2 1 0 134.7hz Tangential0 1 2 138.5hz Tangential
2 1 1 146.2hz Oblique
1 1 2 148.9hz Oblique
0 2 0 157.8hz Axial
2 0 2 157.8hz Tangential
3 0 0 163.8hz Axial
1 2 0 166.9hz Tangential
0 2 1 167.7hz Tangential
0 0 3 170.9hz Axial
3 0 1 173.3hz Tangential
1 2 1 176.2hz Oblique2 1 2 176.4hz Oblique
1 0 3 179.3hz Tangential
3 1 0 181.8hz Tangential
0 1 3 188.2hz Tangential
2 2 0 191.9hz Tangential
0 2 2 194.6hz Tangential
3 0 2 199.5hz Tangential
2 2 1 200.1hz Oblique
1 2 2 202.1hz Oblique
2 0 3 202.7hz Tangential
4 0 0 218.4hz Axial
2 2 2 223.1hz Oblique4 0 1 225.7hz Tangential
3 2 0 227.4hz Tangential
0 0 4 227.8hz Axial
4 1 0 232.2hz Tangential
0 2 3 232.5hz Tangential
0 3 0 236.6hz Axial
!
=>/C&!N!
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EF!
3++4!:+.&!5#>C*($(!
REC4 REC5 REC6 REC7 REC8 REC9 Sp_FrRes
53hz 62.5 60 60 51 60 55 52
54hz 61 60 60 51 61 55 52
55hz 62 61 61 53 62 56 52.5
56hz 65 61 63 53 64 57 52
57hz 65 65 65 54 65 60 53
76hz 50 50 51 55 55 62 55
77hz 50 50 53 56 57 65 55
78hz 48 49 60 60 57 67 55.5
79hz 48 50 61 61.5 59.5 67.5 55.5
80hz 48 50 65 64 60 70 56
94hz 50 53 63 52 44 57 57.5
95hz 52 50 63 51 44 57 57.5
96hz 51 47 65 53 45 58 57.5
97hz 53 45 66 53 45 57.5 58
98hz 52 46 65 54 46 58 58
108hz 65 69 53 63 59 65 59
109hz 69 69 60 65 60 68 59
110hz 69 68 62 66 62 66 59
111hz 64 63 65 62 62 65 59112hz 65 62 64 59 63 64 59.5
113hz 67 66 68 65 65 66 59.5
114hz 70 69 68 69 68 68 59.5
115hz 69 68 64 68 65 64 59.5
145hz 57 48 65 58 54.5 50 60
146hz 56 46 67 57.5 54 50 60
147hz 56 45 68 59 54 51 60
148hz 57 45 70 58 54 53 60.5
149hz 59 46 73 56 57 53 61
156hz 71 62 54 72.5 64 67 60157hz 72 66 64 72 65 72 60.5
158hz 71 64 65 71 64 72 60.5
159hz 70 60 62 66.5 60 68 61
175hz 58 53 65 64 60 74 60
176hz 56 56 64 63 58 74 60
177hz 55 58 60 59.5 55 74 60
178hz 58 58 57 58 52 73 60
!
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?#,C0&!+,!,'&F0*!'&(@+#(&!+#!3++4!:+.&(!
Rec4 Rec5 Rec6 Rec7 Rec8 Rec9
53hz 10.5dB 8dB 8dB -1dB 8dB 3dB
54hz 9dB 8dB 8dB -1dB 9dB 3dB
55hz 9.5dB 8.5dB 8.5dB 0.5dB 9.5dB 3.5dB
56hz 13dB 9dB 11dB 1dB 12dB 5dB
57hz 12dB 12dB 12dB 1dB 12dB 7dB
76hz -5dB -5dB -4dB 0dB 0dB 7dB
77hz -5dB -5dB -2dB 1dB 2dB 10dB
78hz - 7.5dB -6.5dB 4.5dB 4.5dB 2.5dB 11.5dB
79hz -7.5dB -5.5dB 5.5dB 6dB 4dB 12dB80hz -8dB -6dB 9dB 8dB 4dB 14dB
94hz -7.5dB -4.5dB 5.5dB -5.5dB -13.5dB -0.5dB
95hz -5.5dB -7.5dB 5.5dB -6.5dB -13.5dB -0.5dB
96hz -6.5dB
-
10.5dB 7.5dB -4.5dB -12.5dB 0.5dB
97hz -5dB -13dB 8dB -5dB -13dB -0.5dB
98hz -6dB -12dB 7dB -4dB -12dB 0dB
108hz 6dB 10dB -6dB 4dB 0dB 6dB
109hz 10dB 10dB 1dB 6dB 1dB 9dB
110hz 10dB 9dB 3dB 7dB 3dB 7dB
111hz 5dB 4dB 6dB 3dB 3dB 6dB
112hz 5.5dB 2.5dB 4.5dB -0.5dB 3.5dB 4.5dB
113hz 7.5dB 6.5dB 8.5dB 5.5dB 5.5dB 6.5dB
114hz 9.5dB 8.5dB 8.5dB 9.5dB 8.5dB 8.5dB
115hz 8.5dB 7.5dB 5.5dB 8.5dB 5.5dB 4.5dB
145hz -3dB -12dB 5dB -2dB -5.5dB -10dB
146hz -4dB -14dB 7dB -2.5dB -6dB -10dB
147hz -4dB -15dB 8dB -1dB -6dB -9dB
148hz -3.5dB
-
15.5dB 9.5dB -2.5dB -6.5dB -7.5dB149hz -2dB -15dB 12dB -5dB -4dB -8dB
156hz 11dB 2dB -6dB 12.5dB 4dB 7db
157hz 11.5dB 5.5dB 3.5dB 11.5dB 4.5dB 11.5dB
158hz 10.5dB 3.5dB 4.5dB 10.5dB 3.5dB 11.5dB
159hz 9dB -1dB 1dB 6.5dB -1dB 7dB
175hz -2dB -7dB 5dB 4dB 0dB 14dB
176hz -4dB -4dB 4dB 3dB -2dB 14dB
177hz -5dB -2dB 0dB -0.5dB -5dB 14dB
178hz -2dB -2dB -3dB -2dB -8dB 13dB
!
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E
=>/C&!S!
3++4!:+.&!>#>C*($(!7!3&6+'.$#1(!0($#1!!>!.$'&6)$+#>C!4$6'+@2+#&!
Rec4 Rec9 Boost Rec4 Boost Rec9
53hz 54dB 46.5dB 2dB - 5.5dB
54hz 55dB 48dB 3dB - 4dB
55hz 56dB 48.5dB 3.5dB - 4dB
56hz 58dB 50dB 6dB - 2dB
57hz 60dB 49.5dB 7dB - 3.5dB
76hz 54dB 58dB - 1dB 3dB
77hz 53.5dB 60dB - 1.5dB 5dB
78hz 53dB 60.5dB - 2.5dB 5dB
79hz 55dB 64dB - 0.5dB 8.5dB80hz 54.5dB 65dB - 1.5dB 9dB
94hz 50dB 55.5dB - 7.5dB - 2dB
95hz 50dB 57.5dB - 7.5dB 0dB
96hz 51.5dB 56dB - 6dB - 1.5dB
97hz 53.5dB 56dB - 4.5dB - 2dB
98hz 53.5dB 57.5dB - 4.5dB - 0.5dB
108hz 64dB 65.5dB 5dB 6.5dB
109hz 66.5dB 68dB 7.5dB 9dB
110hz 68.5dB 70dB 9.5dB 11dB111hz 66.5dB 67dB 7.5dB 8dB
112hz 65dB 65.5dB 5.5dB 6dB
113hz 67.5dB 66.5dB 8dB 7dB
114hz 69dB 67.5dB 9.5dB 8dB
115hz 68dB 64dB 9.5dB 4.5dB
145hz 60dB 55dB 0dB - 5dB
146hz 60dB 56.5dB 0dB - 3.5dB
147hz 60.5dB 57.5dB 0.5dB - 2.5dB
148hz 62dB 57dB 1.5dB - 3.5dB
149hz 63dB 57.5dB 2dB - 3.5dB
156hz 75dB 73dB 15dB 13dB
157hz 77dB 75dB 16.5dB 14.5dB
158hz 76.5dB 76dB 16dB 15.5dB
159hz 73dB 74dB 12dB 13dB
175hz 61dB 81dB 1dB 21dB
176hz 61.5dB 81dB 1.5dB 21dB
177hz 64dB 80dB 4dB 20dB
178hz 68dB 80dB 8dB 20dB
!
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42#)/.-2/!+,0!@)/-2!A%23,#$#&B!
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E=!
=>/C&!M!
3++4!:+.&!5#>C*($(!7!m'+0@!5#>C*($(!:&)2+.U$#>660'>)&!'&(0C)(W!
REC4 REC5 REC6 REC7 REC8 REC9
53hz 50 46 46 41 52 48 DB
54hz 57 52 52 48 59 52 DB
55hz 62 58 58 54 64 58 DB
56hz 69 63 63 58 69 62 DB
57hz 71 68 68 58 70 66 DB
76hz 55 55 56 58 60 67 DB
77hz 52 55 60 57 58 65 DB
78hz 53 56 61 58 56 66 DB79hz 46 55 66 56 53 63 DB
80hz 35 54 69 50 46 56 DB
94hz 35 51 65 35 29 42 DB
95hz 41 50 63 42 35 50 DB
96hz 49 43 61 50 41 54 DB
97hz 52 38 56 53 46 59 DB
98hz 55 30 50 58 49 60 DB
108hz 70 50 40 69 62 70 DB
109hz 73 62 51 71 67 72 DB110hz 73 70 61 70 68 71 DB
111hz 69 69 66 65 66 68 DB
112hz 65 67 69 61 63 63 DB
113hz 65 69 71 61 62 62 DB
114hz 61 66 71 60 59 59 DB
115hz 52 54 69 54 50 50 DB
145hz 40 32 69 44 39 35 DB
146hz 48 38 68 50 44 41 DB
147hz 52 41 65 55 50 48 DB
148hz 58 44 62 58 56 52 DB
149hz 61 49 58 60 60 58 DB
156hz 75 68 40 78 69 73 DB
157hz 78 71 61 78 71 78 DB
158hz 77 68 68 77 69 78 DB
159hz 72 62 68 72 64 75 DB
175hz 60 58 70 69 62 80 DB
176hz 56 58 68 62 58 77 DB
177hz 51 55 60 53 50 72 DB
178hz 47 50 49 44 40 66 DB
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42#)/.-2/!+,0!@)/-2!A%23,#$#&B!
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!
Ea!
!
=>/C&!Y!
3++4!:+.&!>#>C*($(!U&B6$)$#1!>CC!'++4!4+.&(W!
Roomresonsnces(dB)
Speaker's Frequencyresponse(dB) Boost(dB)
49hz 58 50.5 7.5dB
50hz 60 50.5 9.5dB
51hz 61.5 51 10.5dB
52hz 63 52 11dB
53hz 60 52 8dB
54hz 60 52 8dB
55hz 61 52.5 8.5dB56hz 63 52 11dB
57hz 65 53 12dB
58hz 65 53 12dB
59hz 64 53 11dB
60hz 62.5 53 9.5dB
61hz 61.5 53.5 9dB
62hz 60 53.5 6.5dB
63hz 58 53.5 4.5dB
64hz 57.5 53.5 4dB
65hz 56.5 53.5 3dB
66hz 56 54 2dB67hz 55 54 1dB
68hz 55 54 1dB
69hz 54 54 0dB
70hz 52.5 54 - 1.5dB
71hz 52.5 54.5 - 2dB
72hz 52 54.5 - 2.5dB
73hz 50 54.5 - 5dB
74hz 50 54.5 - 4.5dB
75hz 50 55 - 5dB
76hz 51 55 - 4dB
77hz 53 55 - 2dB
78hz 60 55.5 4.5dB79hz 61 55.5 5.5dB
80hz 65 56 9dB
81hz 62 56 6dB
82hz 60 56.5 3.5dB
83hz 58 56.5 1.5dB
84hz 57 56.5 0.5dB
85hz 58 56.5 1.5dB
86hz 57 57 0dB
87hz 58 57 1dB
88hz 58 57 1dB
89hz 57 57 0dB
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E;!
90hz 60 57 3dB
91hz 60 57 3dB
92hz 61 57.5 3.5dB
93hz 62.5 57.5 5dB
94hz 63 57.5 5.5dB
95hz 63 57.5 5.5dB96hz 65 57.5 7.5dB
97hz 66 58 8dB
98hz 65 58 7dB
99hz 67 58 9dB
100hz 66 58 8dB
101hz 65 58 7dB
102hz 64 58 6dB
103hz 62 58 4dB
104hz 59 58 1dB
105hz 57 58.5 - 1.5dB
106hz 56 58.5 - 2.5dB
107hz 55 58.5 - 3.5dB
108hz 53.5 59 - 5.5dB
109hz 60 59 1dB
110hz 62 59 3dB
111hz 65 59 6dB
112hz 64 59.5 4.5dB
113hz 68 59.5 8.5dB
114hz 68 59.5 8.5dB
115hz 64 59.5 4.5dB
116hz 63 59.5 3.5dB
117hz 60 59.5 0.5dB
118hz 58 59.5 - 1.5dB119hz 57.5 59.5 - 2dB
120hz 57.5 59.5 - 2dB
121hz 57 59.5 - 2.5dB
122hz 57 59.5 - 2.5dB
123hz 57 59.5 - 2.5dB
124hz 63.5 59.5 4dB
125hz 66 59.5 6.5dB
126hz 71 59.5 11.5dB
127hz 70.5 60 10.5dB
128hz 68 60 8dB
129hz 66 60 6dB
130hz 65 60 5dB
131hz 64 60 4dB
132hz 62.5 60 2.5dB
133hz 63.5 60 3.5dB
134hz 63 60 3dB
135hz 60 60 0dB
136hz 59.5 60 - 0.5dB
137hz 60.5 60 0.5dB
138hz 66 60 6dB
139hz 65.5 60 5.5dB
140hz 65 60 5dB
141hz 64 60 4dB
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F:!
142hz 63 60 3dB
143hz 64 60 4dB
144hz 64 60.5 3.5dB
145hz 65 60.5 4.5dB
146hz 67 60.5 6.5dB
147hz 68 60 8dB148hz 70 60.5 9.5dB
149hz 73 61 12dB
150hz 69 61 8dB
151hz 66 61 5dB
152hz 62.5 60.5 2dB
153hz 60 60.5 - 0.5dB
154hz 55 60.5 - 5.5dB
155hz 52 60 - 8dB
156hz 54 60 - 6dB
157hz 64 60.5 3.5dB
158hz 65 60.5 4.5dB
159hz 62 61 1dB
160hz 57 61 - 4dB
161hz 56.5 61 -4.5dB
162hz 56 61.5 - 5.5dB
163hz 56 60.5 -4.5dB
164hz 54 60.5 - 6.5dB
165hz 54.5 60.5 - 6dB
166hz 55.5 60.5 - 5dB
167hz 56 60 - 4dB
168hz 56 60 - 4dB
169hz 57.5 60 - 2.5dB
170hz 58 60 - 2dB171hz 59.5 60 - 0.5dB
172hz 60 60 0dB
173hz 62.5 60 2.5dB
174hz 63 60 3dB
175hz 65 60 5dB
176hz 64 60 4dB
177hz 62 60 2dB
178hz 65 60 5dB
179hz 66 60 6dB
180hz 65.5 60 5.5dB
!
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=>/C&!P!
REVERBERATION TIME
Studio 1
Pink Noise(rec5) Pink Noise(rec6) Pink Noise(rec7)
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FY!
RT60 RT60 RT60
63 Hz 1.62 1.55 1.58
125Hz 1.45 1.58 1.48
250Hz 1.68 1.6 1.55
500Hz 1.51 1.41 1.55
1Khz 1.54 1.55 1.622Khz 1.58 1.5 1.61
4Khz 1.29 1.4 1.34
8Khz 1.46 1.45 1.5
White Noise(rec5)
White
Noise(rec6)
White
Noise(rec7)
RT60 RT60 RT60
63 Hz 1.66 1.6 1.55
125Hz 1.48 1.45 1.52
250Hz 1.33 1.42 1.45500Hz 1.22 1.3 1.45
1Khz 1.33 1.44 1.48
2Khz 1.23 1.43 1.39
4Khz 1.3 1.4 1.4
8Khz 1.29 1.32 1.4
!
=>/C&!Z!
Studio 2
Pink Noise(rec5) Pink Noise(rec6) Pink Noise(rec7)
RT60 RT60 RT60
63 Hz 1.1 1.02 0.99
125Hz 1.04 0.9 0.75
250Hz 1.09 1.1 0.88
500Hz 1.12 1.02 0.98
1Khz 0.9 0.83 0.84
2Khz 0.82 0.9 1.08
4Khz 0.69 0.79 0.84
8Khz 0.73 0.76 0.88
White Noise(rec5)
WhiteNoise(rec6)
WhiteNoise(rec7)
RT60 RT60 RT60
63 Hz 0.88 1.01 0.92
125Hz 0.6 0.64 0.77
250Hz 0.93 0.88 0.93
500Hz 0.86 1 0.88
1Khz 0.9 0.91 0.8
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!
F>!
2Khz 0.84 0.9 0.89
4Khz 0.82 0.88 1
8Khz 0.9 0.91 0.79
!
!
=>/C&!LT!
3=MT!5%&'>1&!
RT60 & Abs.CoefStudio 1(RT) Studio 2(RT) Studio 1(a) Studio 2(a)
63 Hz 1.59 0.98 0.046 0.075125Hz 1.49 0.78 0.049 0.094
250Hz 1.5 0.96 0.049 0.076
500Hz 1.4 0.97 0.052 0.075
1Khz 1.49 0.86 0.049 0.085
2Khz 1.45 0.9 0.05 0.081
4Khz 1.35 0.82 0.054 0.089
8Khz 1.4 0.82 0.052 0.089
Average= 1.45
Average =
0.88
Average=
0.05
Average=
0.083
!
=>/C&!LL!
]'&F0$&(!+,!:0($6>C!#+)&(!UMTW!
F#1 46.25hz
G1 49hz
G#1 51.91hz
A1 55hzA#1 58.27hz
B1 61.74hz
C2 65.41hz
C#2 69.30hz
D2 73.42hz
D#2 77.78hz
E2 82.41hz
F2 87.31hz
F#2 92.50hz
G2 98hz
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42#)/.-2/!+,0!@)/-2!A%23,#$#&B!
C-,+$!95#D%2.!
!
FE!
G#2 103.83hz
A2 110hz
!
=>/C&!LA!
3&%&'/&'>)$+#!3++4!:&>(0'&4)(!
Empty Room1stRec 2ndRec 3rdRec 4thRec Average
RT60 RT60 RT60 RT60
63hz 10.56s 10.48s 10.90s 9.90s 10.46s
125hz 10.4s 10.4s 9s 11.2s 10.25s
250hz 8.85s 8.45s 9.1s 8.7s 8.77s
500hz 6.66s 7.11s 4.6s 5.61s 6.04s
1khz 5.16s 4.92s 5.73s 6.3s 5.52s
2khz 4.23s 4.08s 4.44s 4.98s 4.43s
4khz 3.31s 3.27s 3.65s 3.80s 3.51s
8khz 2.21s 2.18s 2.4s 2.52s 2.32s
6.41s
Room with material1stRec 2ndRec 3rdRec 4thRec Average
RT60 RT60 RT60 RT60
63hz 4.6s 5.00s 5.02s 4.32s 4.73s
125hz 4s 4.6s 4.95s 5.2s 4.68s
250hz 4.11s 4.53s 4.68s 5.1s 4.60s
500hz 3.51s 3.27s 4.37s 3.51s 3.66s
1khz 3.12s 2.92s 3.15s 3.00s 3.04s
2khz 2.52s 2.41s 2.69s 2.94s 2.64s
4khz 2.1s 2.15s 2.33s 2.40s 2.24s
8khz 1.68s 1.6s 1.72s 1.78s 1.69s
3.41s
!
=>/C&!LN!
5'&>!6>C60C>)$+#!7!
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!
42#)/.-2/!+,0!@)/-2!A%23,#$#&B!
C-,+$!95#D%2.!
!
FF!
Wall2 3.15m 3.02m 9.513
Wall1' 2.18m 3.02m 6.583
Wall2' 3.15m 3.02m 9.513
Ceiling 3.15m 2.18m 6.867
Floor 3.15m 2.18m 6.867
Total Area45.926
Window 1.14m 1.14m 1.299
Door 2.17m 1.10m 2.387
Vent 0.41m 0.48m 0.168
!
=>/C&!LR!
5/(+'@)$+#!6+&,,$6$)!+,!D>CC!4>)&'$>C!+#!/C&!LS!
c$()!+,!>/(+'@)$+#!6+&,,$6$)(!USZW!
125h
z
250h
z
500h
z
1kh
z
2kh
z
4kh
z
Floor Materials
carpet 0.01 0.02 0.06 0.15 0.25 0.45
Concrete(unpainted) 0.01 0.02 0.04 0.06 0.08 0.1
Concrete(painted) 0.01 0.01 0.02 0.02 0.02 0.02
Marble or glazed tile 0.01 0.01 0.01 0.01 0.02 0.02
Vinyl tile 0.02 0.03 0.03 0.03 0.03 0.02
Wood Parquet on concrete 0.04 0.04 0.07 0.06 0.06 0.07
Wood flooring on Joists 0.15 0.11 0.1 0.07 0.06 0.07
Wall materials
Brick (Natural) 0.03 0.03 0.03 0.04 0.05 0.07
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42#)/.-2/!+,0!@)/-2!A%23,#$#&B!
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!
F?!
Brick(painted) 0.01 0.01 0.02 0.02 0.02 0.03
Concrete Block(coarse) 0.36 0.44 0.31 0.29 0.39 0.25
Concrete Block(Painted) 0.1 0.05 0.06 0.07 0.09 0.08
Doors(Solid wood panels) 0.1 0.07 0.05 0.04 0.04 0.04
Glass(1/4" plate, large pane) 0.18 0.06 0.04 0.03 0.02 0.02
Glass(small pane) 0.04 0.04 0.03 0.03 0.02 0.02Plasterboard(12mm(1/2")paneling on studs) 0.29 0.1 0.06 0.05 0.04 0.04
Plaster(gypsum or lime,on masonry) 0.01 0.02 0.02 0.03 0.04 0.05
Plaster(gypsum or lime,on wood lath) 0.14 0.1 0.06 0.05 0.04 0.04Plywood(3mm(1/8")pan.over31.7mm(1-1/4")airspace 0.15 0.25 0.12 0.08 0.08 0.08Plywood(3mm(1/8")pan.over57.1mm(2-1/4")airspace 0.28 0.2 0.1 0.1 0.08 0.08Plywood(3mm(3/16")pan.over50mm(2")airspace 0.38 0.24 0.17 0.1 0.08 0.05
Drapery(10oz/yd2,340gr/m2,flat against wall) 0.04 0.05 0.11 0.18 0.3 0.35
Drapery(14oz/yd2,476gr/m2,flat against wall) 0.05 0.07 0.13 0.22 0.32 0.35
Fiberglass board(25mm(1")thick) 0.06 0.2 0.65 0.9 0.95 0.98
Fiberglass board(50mm(1")thick) 0.18 0.79 0.99 0.99 0.99 0.99
Fiberglass board(75mm(1")thick) 0.53 0.99 0.99 0.99 0.99 0.99Performatedmetal(13%open,over50mm(2")fiberglas) 0.25 0.64 0.99 0.97 0.88 0.92
Ceiling materialsPlasterboard(12mm(1/2")in suspended ceiling
grid 0.15 0.11 0.04 0.04 0.07 0.08Underlay in perforated metal panels
25mm(1")batts) 0.51 0.78 0.57 0.77 0.9 0.79Metal deck(perforated channels
25mm(1")batts) 0.19 0.69 0.99 0.88 0.52 0.27Metal deck(perforated channels75mm(3")batts) 0.73 0.99 0.99 0.89 0.52 0.31
People(adults)(per 1/10 person) 0.25 0.35 0.42 0.46 0.5 0.5
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Down Length 1 5.74mDown Length 2 6.11m
Up Length 1 5.80m
Up Length 2 6.30m
Down Width 1 1.77m
Down Width 2 2.78m
Up Width 1 1.82m
Up Width 2 2.84m
Height 1 2.44m
Height 2 2.92m
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A(sabins) a(coef) a'(coef)
63hz 0.679 0.949 0.46
125hz 0.681 0.953 0.46
250hz 0.606 0.848 0.41
500hz 0.635 0.888 0.43
1khz 0.868 1.214 0.59
2khz 0.902 1.262 0.61
4khz 0.948 1.325 0.64
8khz 0.943 1.319 0.64!
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RT
63hz 0.44s
125hz 0.36s
250hz 0.44s
500hz 0.44s
1khz 0.38s
2khz 0.40s
4khz 0.37s
8khz 0.37s
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RT(sec)
Recording
Studio 0.2 - 0.6
Classroom 0.6 - 1.0
ConferenceRoom 0.6 - 1.0
Cinemas 0.8 - 1.2
Small Theatres 1.0 - 1.4
Auditoriums 1.4 - 2.0
Churches 1.4 - 2.0
Rock Bands 1.0 - 1.4Classical Music 1.2 - 1.6
Chamber Music 1.4 - 1.8
Opera 1.4 - 1.8
Secular Choir 1.6 - 2.0
Symphonic 1.6 - 2.2
Orchestra 1.8 - 2.6
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