Dell
Dell PowerEdge M910 Technical Guide 16
5.2 Acoustics
Adherence to Dell’s high sound quality standards. Sound quality is different from sound power level
and sound pressure level in that it describes how humans respond to annoyances in sound, like
whistles, hums, etc. One of the sound quality metrics in the Dell specification is prominence ratio of
a tone, and this is listed in the table below.
Acoustical Performance of Typical Configuration: When installed in the M1000e blade chassis,
typical configuration
(shown in Table 4of M910 blade results in the following idle acoustical
performance in 23±2° C ambient:
LwA-UL
= 8.1 bels and no prominent tones
Table 4. Typical Configuration Used in Testing
Intel® Xeon® processor 7500
series 105W
Typical configuration means projected average quantity, type, capacity, speed, etc., of components. Configuration for
which data reported is listed in Table 4.
LwA – UL is the upper limit sound power level (LwA) calculated per section 4.4.2 of ISO 9296 (1988) and measured in
accordance to ISO 7779 (1999).
Prominent tone: Criteria of D.5 and D.8 of ECMA-74 9th ed. (2005) are followed to determine if discrete tones are
prominent. The system is placed in a rack with its bottom at 75 cm from the floor. The acoustical transducer is at front
bystander position, ref ISO7779 (1999) Section 8.6.2.
