Larson Davis 831 - Page 463

A-26 1/1 and 1/3 Octave Filters Model 831 Manual
1/3 Octave Filter Linearity
The filter linearity range depends upon both the Input Gain, which is set as described in the section "20
dB Gain" on page 4-5, and the Filter Range, which is set as described in the section "OBA Range
Setting" on page 4-7.The data, which were measured using an electrical input, are in dB re. 1 V,
which is equivalent to dBSPL when a 50 mV/Pa microphone is use.
Table A-21 1/3 Octave Linearity Range
Gain 0 dB 0 dB 20 dB 20 dB
Range Normal Low Normal Low
Frequency Overload
Linearity
Range
Lower
Linearity
Limit Noise Floor Overload
Linearity
Range
Lower
Linearity
Limit Noise Floor Overload
Linearity
Range
Lower
Linearity
Limit Noise Floor Overload
Linearity
Range
Lower
Linearity
Limit Noise Floor
6.3
140.8 88.1 52.0 27.6 107.5 71.5 36.0 12.3 120.7 81.7 39.0 13.5 87.0 53.0 34.0 9.9
8
140.8 91.8 49.0 26.7 107.5 74.5 33.0 9.6 120.7 87.7 33.0 12.7 87.0 47.0 40.0 9.6
10
140.8 92.8 48.0 28.4 107.5 78.5 29.0 8.3 120.7 87.7 33.0 11.3 87.0 58.0 29.0 9.3
12.5
140.8 91.8 49.0 28.2 107.5 75.9 31.6 8.8 120.7 89.7 31.0 9.1 87.0 59.0 28.0 7.9
16
140.8 91.8 49.0 25.5 107.5 76.7 30.8 6.9 120.7 88.7 32.0 10.6 87.0 60.0 27.0 6.8
20
140.8 92.8 48.0 27.7 107.5 78.7 28.8 6.0 120.7 90.7 30.0 9.8 87.0 59.0 28.0 5.6
25
140.8 94.8 46.0 25.7 107.5 81.5 26.0 5.5 120.7 87.7 33.0 8.8 87.0 60.0 27.0 5.9
31.5
140.8 93.8 47.0 26.5 107.5 85.5 22.0 5.3 120.7 90.7 30.0 8.4 87.0 64.0 23.0 4.1
40
140.8 93.8 47.0 25.7 107.5 85.5 22.0 3.6 120.7 92.7 28.0 8.1 87.0 63.0 24.0 2.6
50
140.8 95.8 45.0 25.2 107.5 86.5 21.0 1.5 120.7 92.7 28.0 7.7 87.0 66.0 21.0 2.5
63
140.8 97.8 43.0 25.7 107.5 87.5 20.0 1.5 120.7 95.7 25.0 8.4 87.0 67.0 20.0 2.9
80
140.8 98.8 42.0 25.8 107.5 83.5 24.0 1.2 120.7 93.7 27.0 7.5 87.0 71.0 16.0 2.7
100
140.8 97.8 43.0 25.0 107.5 84.5 23.0 0.5 120.7 96.7 24.0 7.6 87.0 69.0 18.0 2.3
125
140.8 96.8 44.0 24.6 107.5 87.5 20.0 -1.4 120.7 94.7 26.0 6.2 87.0 71.0 16.0 -0.3
160
140.8 100.8 40.0 25.2 107.5 88.5 19.0 -1.8 120.7 95.7 25.0 4.4 87.0 73.0 14.0 -2.4
200
140.8 99.8 41.0 25.6 107.5 87.5 20.0 -1.8 120.7 99.7 21.0 5.8 87.0 71.0 16.0 -1.5
250
140.8 99.8 41.0 27.7 107.5 93.5 14.0 -3.0 120.7 98.7 22.0 4.8 87.0 75.0 12.0 -3.0
315
140.8 101.8 39.0 26.5 107.5 96.5 11.0 -2.5 120.7 99.7 21.0 5.6 87.0 74.0 13.0 -3.1
400
140.8 97.8 43.0 26.0 107.5 95.5 12.0 -2.0 120.7 96.7 24.0 8.1 87.0 75.0 12.0 -3.6
500
140.8 98.8 42.0 25.9 107.5 89.5 18.0 -2.1 120.7 92.7 28.0 5.6 87.0 79.0 8.0 -3.1
630
140.8 101.7 39.1 25.8 107.5 96.5 11.0 -2.3 120.7 100.7 20.0 6.0 87.0 80.0 7.0 -4.2
800
140.8 100.7 40.1 26.5 107.5 94.5 13.0 -3.0 120.7 99.7 21.0 6.1 87.0 81.0 6.0 -4.1
1000
140.8 97.8 43.0 26.9 107.5 95.5 12.0 -3.1 120.7 100.7 20.0 6.4 87.0 81.0 6.0 -4.9
1250
140.8 99.8 41.0 27.8 107.5 97.5 10.0 -2.9 120.7 100.7 20.0 7.6 87.0 79.0 8.0 -6.6
1600
140.8 100.8 40.0 28.3 107.5 96.5 11.0 -2.6 120.7 100.7 20.0 8.0 87.0 82.0 5.0 -7.4
2000
140.8 100.8 40.0 28.8 107.5 97.5 10.0 -2.1 120.7 100.7 20.0 8.7 87.0 82.0 5.0 -7.7
2500
140.8 99.8 41.0 29.8 107.5 96.5 11.0 -1.5 120.7 99.7 21.0 9.6 87.0 81.0 6.0 -7.6
3150
140.8 96.8 44.0 30.9 107.5 94.5 13.0 -0.4 120.7 98.7 22.0 10.6 87.0 81.0 6.0 -7.6
4000
140.8 97.7 43.1 31.9 107.5 94.5 13.0 0.4 120.7 97.7 23.0 11.6 87.0 82.0 5.0 -7.0
5000
140.8 95.7 45.1 33.1 107.5 92.5 15.0 1.4 120.7 96.7 24.0 13.0 87.0 82.0 5.0 -6.5
6300
140.8 93.8 47.0 33.9 107.5 93.5 14.0 2.4 120.7 94.7 26.0 14.1 87.0 81.0 6.0 -6.1
8000
140.8 91.8 49.0 35.5 107.5 91.5 16.0 3.5 120.7 92.7 28.0 15.0 87.0 80.0 7.0 -5.2
10000
140.8 92.7 48.1 36.6 107.5 90.5 17.0 4.5 120.7 93.7 27.0 16.4 87.0 79.0 8.0 -4.5
12500
140.8 91.7 49.1 37.6 107.5 89.5 18.0 5.8 120.7 91.7 29.0 17.5 87.0 79.0 8.0 -3.6
16000
140.8 90.8 50.0 38.6 107.5 89.5 18.0 6.5 120.7 91.7 29.0 18.5 87.0 78.0 9.0 -2.9
20000
140.8 88.8 52.0 40.2 107.5 87.7 19.8 8.2 120.7 89.7 31.0 20.2 87.0 77.0 10.0 -1.6