Noise Reduction Performance

Server noise attenuation:

18.5 dBA broadband noise reduction, measured 1.0 m / 39¨ in front of the cabinet (Representing the elimination of 98.5% of server noise)

Practical explanation:

The field of acoustics is not an area familiar to many IT managers and therefore the following guidelines are offered.

"dBA" is the common measurement unit used to quantify Sound Pressure Level (SPL), which is technical terminology for “how loud things are”. As usual with these things, there’s no need for the end user to fully understand dBA. The things that matter are how many or how few of them there are, and what that means in the real world. For reference, here are some widely-accepted examples of SPL ratings that are relevant when installing servers in the workplace:

50 dBA  Background noise in an average office, without speech

55 dBA  Background noise in a busy office, without speech

60 dBA  Normal conversational speech

45 to 50 dBA  Typical noise from fully integrated or cassette-type building air conditioning

55 dBA + Typical noise from portable air conditioners

62 dBA  Typical noise from 2 x low form factor servers with average CPU loads

65 dBA  Typical noise from 4 x low form factor servers with average CPU loads

68 dBA  Typical noise from 8 x low form factor servers with average CPU loads
(every doubling of the number of servers leads to a 3 dBA increase in the total noise level)

In order for an installation to become unobtrusive in an office environment, the noise from the servers and other hardware in the installation must be reduced to the level of the general office background noise. At such reduced levels, the human brain perceives the noise from the servers as part of the overall background noise, and it will go unnoticed on a day-to-day basis, in much the same way that the hum from most built-in office air conditioning systems do.

The following tables give a guide to how this is achieved by the use of NetShelter CX server enclosures.


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