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PURE SILENCE JF0925S1ES
Ambient noise at the time of testing was 18 dBA.
| Brand |
Pure
Silence |
Power Rating |
0.10A / 0.96W |
| Manufacturer |
Jamicon |
Airflow Rating |
32 CFM |
| Model Number |
JF0925S1ES |
RPM Rating |
1,700 RPM |
| Retail Availability |
UK |
Noise Rating |
15 dBA |
| Bearing Type |
Sleeve |
Header Type |
3-pin & Molex adapter |
| Hub Size |
1.29" |
Starting Voltage |
3.1V |
| Frame Size |
92 x 92 x 25 mm |
Number of Samples |
2 |
|
Our thanks to Pure
Silence
for supplying these samples.
|
|
Voltage
|
Noise
|
RPM
|
CFM
|
Power
|
|
12V
|
26 dBA@1m
|
1770 RPM
|
38 CFM
|
0.93W
|
|
9V
|
21 dBA@1m
|
1350 RPM
|
28 CFM
|
0.73W
|
|
7V
|
21 dBA@1m
|
1040 RPM
|
21 CFM
|
0.60W
|
|
5V
|
20 dBA@1m
|
710 RPM
|
13 CFM
|
0.46W
|
|
@15 CFM (5.6V)
|
20 dBA@1m
|
810 RPM
|
15 CFM
|
0.50W
|
May 5, 2008
The updated airflow results here are the result of improvements
in our testing procedures. They are more accurate than the original results
above, but they are not directly comparable. Please compare these only with
fan reviews published after May 5, 2008 — or ones that have updated
results published in a box like this one. |
|
12V
|
26 dBA@1m
|
1770 RPM
|
24 CFM
|
0.93W
|
|
9V
|
21 dBA@1m
|
1350RPM
|
19 CFM
|
0.73W
|
|
7V
|
21 dBA@1m
|
1040 RPM
|
14 CFM
|
0.60W
|
|
5V
|
20 dBA@1m
|
710 RPM
|
9 CFM
|
0.46W
|
|
@15 CFM (7.2V)
|
21dBA@1m
|
1050 RPM
|
15 CFM
|
0.61W
|
Pure Silence is a tiny British company that specializes in low noise computer
components, modding accessories, and iPod skins. Oh, and for some reason it
also sells energy efficient lightbulbs, a 15m garden hose and an inflatable
pool. We don't recommend using your computer in the pool, no matter how quiet
it is.
If you thought it was unlikely that a company that sells inflatable pools manufactures
their own line of fans, you'd be right; the model number identifies the original
manufacurer as Jamicon
— makers of an excellent line of quiet 80mm fans. The thin, fragile support
struts are a hallmark of Jamicon's fan design, removing any lingering doubts
about where the fan's origins.
Unfortunately, Jamicon's reputation does not seem to have helped here, as the
noise character was too rough and unpleasant to compete with the Nexus. The
Pure Silence was always audible (never thought I'd write that sentence),
no matter how much we reduced the voltage. At 9V and above, the noise was a
mixed clatter of buzzing and clicking. The noise eventually dropped to a subdued
rumble as the reduced speed took the sharpness and intensity off of the sound.
A ringing overtone could also be heard between 7V and 10V. We would like to
be able to say that the low vibration exhibited by the Pure Silence is a good
sign for noise, but given how poor the rest of the noise character is, the low
vibration is irrelevant.
As expected for a sleeve bearing fan, the fan speed dropped slightly when blowing
downwards. Mounting the Pure Silence in this position (in a home theater case,
for example) is not recommended.
Noise Recordings
ACOUSTIFAN AF92CT
Ambient noise at the time of testing was 18 dBA.
| Brand |
AcoustiFan |
Power Rating |
0.18A |
| Manufacturer |
Globefan |
Airflow Rating |
41.7 CFM |
| Model Number |
AF92CT |
RPM Rating |
2,000 RPM |
| Retail Availability |
Yes |
Noise Rating |
25.9 dBA |
| Bearing Type |
Sleeve |
Header Type |
3-pin |
| Hub Size |
1.3" |
Starting Voltage |
3.8V |
| Frame Size |
92 x 92 x 25 mm |
Number of Samples |
2 |
|
Our thanks to
AcoustiFan
for supplying these samples.
|
|
Voltage
|
Noise
|
RPM
|
CFM
|
Power
|
|
12V
|
30 dBA@1m
|
1920 RPM
|
47 CFM
|
1.97W
|
|
9V
|
28 dBA@1m
|
1590 RPM
|
38 CFM
|
1.41W
|
|
7V
|
21 dBA@1m
|
1310 RPM
|
31 CFM
|
1.08W
|
|
5V
|
~19 dBA@1m
|
960 RPM
|
21 CFM
|
0.76W
|
|
@15 CFM (4.0V)
|
<18 dBA@1m
|
760 RPM
|
15 CFM
|
0.54W
|
May 5, 2008
The updated airflow results here are the result of improvements
in our testing procedures. They are more accurate than the original results
above, but they are not directly comparable. Please compare these only with
fan reviews published after May 5, 2008 — or ones that have updated
results published in a box like this one. |
|
12V
|
30 dBA@1m
|
1920 RPM
|
30 CFM
|
1.97W
|
|
9V
|
28 dBA@1m
|
1590 RPM
|
23 CFM
|
1.41W
|
|
7V
|
21 dBA@1m
|
1310 RPM
|
19 CFM
|
1.08W
|
|
5V
|
~19 dBA@1m
|
960 RPM
|
14 CFM
|
0.76W
|
|
@15 CFM (5.3V)
|
~19 dBA@1m
|
1010 RPM
|
15 CFM
|
0.79W
|
AcoustiFan (or AcoustiProducts) is best known for their Acoustipack sound-proofing
material, which is some of the best available and comes pre-cut for several
popular cases. And, if a company built on sound-proofing doesn't speak of a
devotion to low noise, we don't know what does.
Our first glimpse of the AcoustiFan was promising. In addition to the fan itself,
the package included a little plastic baggie with silicone grommets and a 56?
inline fan resistor to cut the voltage to 7.5V (we measured 8.5V). The fan is
controlled thermally by a thermistor than can be positioned wherever the user
sees fit. As a result, the fan spun at ~1,250 RPM at room temperature (21°C),
or 910 RPM with the inline resistor in place. This corresponds to an operating
noise level of 19~20 dBA@1m, which is certainly very quiet.
Silencing accessories include silicone grommets (hard) and an inline fan
resistor.
For testing purposes, the thermistor was short-circuited, disabling thermal
control and effectively running the fan at full speed. We could then test the
fan like we do any other, using voltage to change speed without worrying about
how temperature would affect things.
A thermistor helps keep the default noise level quite low.
The noise character of the Acoustifan is smooth enough, though not quite on
par with the Nexus or the Fander. At higher speeds, the noise is full of ringing
and thrumming that seems to be a result of the plastic frame resonating. This quality has been noted before with other clear plastic fans. As a result, the Acoustifan is slightly louder than it could be and it never quite disappears into the background the way the Nexus and the Fander do.
Even so, the difference is not large, and many people will find that it suits
their needs. The Acoustifan product
page is full of testimonials from satisfied customers. Perhaps their
line of black plastic dust-proof fans does not suffer from this resonance issue.
Noise Recordings
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