Carpeted Aisles versus Concrete Aisles

Note that all results from a run with aisles uncovered (i.e. concrete) are nearly indistinguishable from those results of a run with the aisles covered with carpet. This is because the percentage of surface area of the hall covered by aisles is only ~1% to 2%.

Figure 1. Early Decay Time (EDT) of hall with concrete aisles

Figure 2. Early Decay Time (EDT) of hall with carpeted aisles

Carpeted Aisles versus Concrete Aisles

Note that all results from a run with aisles uncovered (i.e. concrete) are nearly indistinguishable from those results of a run with the aisles covered with carpet. This is because the percentage of surface area of the hall covered by aisles is only ~1% to 2%.

Figure 3. Reverberation Time (T30) of hall with concrete aisles

Figure 4. Reverberation Time (T30) of hall with carpeted aisles

Carpeted Aisles versus Concrete Aisles

Note that all results from a run with aisles uncovered (i.e. concrete) are nearly indistinguishable from those results of a run with the aisles covered with carpet. This is because the percentage of surface area of the hall covered by aisles is only ~1% to 2%.

Table 1. Acoustical Statistics of hall with concrete aisles

Receiver at Center of Hall (Ground Level) (x,y,z) = (30.00, 0.00, 2.00)

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Band (Hz) 63 125 250 500 1000 2000 4000 8000

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EDT(s) 3.18 3.29 2.94 3.18 2.96 2.77 1.92 0.90

T30(s) 4.24 4.46 4.21 4.80 4.50 4.07 2.65 1.12

SPL(dB) 47.5 48.3 47.9 48.2 48.1 48.2 47.2 44.3

C80(dB) -3.5 -3.0 -1.6 -1.2 -0.6 -0.4 1.2 5.5

D50 0.23 0.24 0.30 0.33 0.36 0.37 0.45 0.65

Ts(ms) 230 232 200 209 190 177 122 56

LF 0.162 0.238 0.305 0.352 0.365 0.379 0.371 0.340

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SPL(A) = 54.5(dB)

LLSPL(A) = 47.3(dB)

STI = 0.45 (Theoretical based on T30, STI = 0.34)

Table 2. Acoustical Statistics of hall with carpeted aisles

Receiver at Center of Hall (Ground Level) (x,y,z) = (30.00, 0.00, 2.00)

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Band (Hz) 63 125 250 500 1000 2000 4000 8000

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EDT (s) 3.17 3.28 2.93 3.13 2.91 2.70 1.86 0.87

T30(s) 4.32 4.45 4.26 4.75 4.43 4.01 2.78 1.06

SPL (dB) 47.5 48.3 47.9 48.1 48.0 48.0 47.1 44.2

C80(dB) -3.5 -3.0 -1.5 -1.1 -0.4 -0.1 1.4 5.7

D50 0.23 0.25 0.30 0.33 0.37 0.39 0.46 0.65

Ts(ms) 229 232 199 206 186 172 119 54

LF 0.162 0.238 0.305 0.351 0.364 0.376 0.367 0.336

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SPL(A) = 54.4(dB)

LLSPL(A) = 47.0(dB)

STI = 0.45 (Theoretical based on T30, STI = 0.34)