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http://www.hushtechnologies.net/start.html LWA (bels) (1 bel = 10 dB, re 10-12 Watt) Sound Pressure Operator’s Position LPA (dB) (re 2 x 10-5 Pa) Idle 2.7 bels 19.3dB DVD Drive Accessing 4.21bels 37.8dB Hard Drive Accessing 3.15bels 21.7dB