HP 500B - Microtower PC Maintenance And Service Manual page 106

Table H-1 Specifications (continued)
Acoustic noise
NOTE: Listed are the declared A-weighted sound power levels (LWAd) and declared average desktop seated
operator position A-weighted sound pressure levels (LpAm) when the product is operating in a 23°C (73.4°F) ambient
environment.
NOTE: Noise emissions were measured in accordance with ISO 7779 (ECMA 74) and declared in accordance with
ISO 9296 (ECMA 109).
98 Appendix H Specifications
LWAd = 43 dB LWAd = 55 dB
Desktop average LpAm = Desktop average LpAm
32 dBA = 44 dBA