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Strutt|Input Data|Empirical|Air Compressor (Small) inserts sound power levels into the active row of the worksheet. Sound power levels are applicable up to 75 kW and have been calculated from sound pressure levels at 1m distance.

Sound power levels have been calculated using the following sound pressure levels (dB):

Power (kw)	Up to 1.5	2 - 6	7 - 75
31.5 Hz	82	87	92
63 Hz	81	84	87
125 Hz	81	84	87
250 Hz	80	83	86
500 Hz	83	86	89
1 kHz	86	89	92
2 kHz	86	89	92
4 kHz	84	87	90
8 kHz	81	84	87

References:

• Bies, D., Hansen, C., Engineering Noise Control, pp515 - 519
• Miller, L, Noise Control for Buildings and Manufacturing Plants, Table 7-15