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Acoustical Noise Declaration for IBM System z9 109 (More Information)

  
Declared Noise Emissions in Accordance with ISO 9296
Product Description Declared A-Weighted Sound Power Level,
L WAd (B) 		Declared A-Weighted Sound Pressure Level,
L pAm (dB)
Operating Idling Operating Idling
Typical configuration: Two processor books and three I/O cages. Nominal operating conditions and front and rear doors closed. 7.5 7.5 55 55
Maximum configuration: Four processor books and three I/O cages. Nominal operating conditions and front and rear doors closed. 7.6 7.6 56 56

Notes:
1.  LWAd is the statistical upper-limit A-weighted sound power level (rounded to the nearest 0.1 B);
2.  LpAm is the mean A-weighted emission sound pressure level measured at the 1-meter bystander positions (rounded to the nearest dB);
3.  10 dB (decibel) = 1 B (bel);
4.  All measurements made in conformance with ISO 7779 and declared in conformance with ISO 9296

Information on Relative Noisiness
Actual L WAd for this product (B) 7.5
L WAd for a product that would sound roughly twice as loud or twice as noisy (B) 8.5
L WAd for a product that would sound roughly half as loud or half as noisy (B) 6.5
Typical range of LWAd values for similar IBM mainframe servers (B) 7.0-7.7

Information on the Emission of Prominent Discrete Tones and Impulsive Noise
This product emits no prominent discrete tones according to the methods of ISO 7779, Annex D.
This product emits no impulsive noise according to the methods of ISO 7779, Annex E.

 
More information
What is an Acoustical Noise Declaration?  
Acoustical Noise Declarations for other IBM Products