Sound Test Results

Tranquil PC Limited - United Kingdom, 8th July 2003

After exhaustive tests conducted in accordance with International Standards ISO 7779 and ISO 9296, by a UK accredited test laboratory, it has been declared that the Tranquil PC unit is quiet! Please read on.

How quiet is quiet?

There are many ways to describe how loud or quiet a piece of equipment is. In order to describe how quiet the Tranquil PC is we asked an accredited laboratory to test in accordance with the ISO 7779, and present this data in accordance with the ISO 9296 noise declaration standard.

A full set of results is available on request, below is a summary of the report.

Product: Tranquil PC unit*

Declared Noise Emissions in accordance with ISO 9296 1988 Noise emitted by computer and business equipment Part 3. Method for determining and verifying declared noise emission values

Service Level	Sound Power Level (L_WAd, B)	Sound Pressure Level Operator Position (L_pAm, decibels) {re 2x10⁵Pa}
IDLE	2.9	16
Hard Disk Access	3.2	18
CDROM access	3.1	17

Examples of noise in daily life

So what does that mean - below are a few examples to help you understand

Source	L_W bel [ B ]
A silent object	- ∞ B
An object that emits sound	> 0.0 B
Tranquil PC in idling	2.9 B
Human whispering very soft	3.4 B
PCs in idling - design goal according to an Intel® study	4.0 B
Dishwasher - quiet one	4.6 B
PCs in idling - accepted upper level according to TCO'99	4.8 B
Human talking in conversational level	6.9 B
Vacuum cleaner - extremely quiet one	7.2 B
Dishwashers - upper range	8.0 B
Lawn mover	9.5 B
Chainsaw	11.0 B
Saturn rocket	20.0 B
Copyright of The Silent PC 1998-2003 Reproduced with kind permission of The Silent PC - with the addition of Tranquil PC line

*Unit tested:
1GHz CPU
120GB HDD
TEAC CDROM