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Old 31st March 2006, 15:29   #1
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12-Way 120mm Fan Roundup

# Aerocool Turbine 1000
# Aerocool Turbine 2000
# Aerocool Turbine 3000
# Enermax Warp
# ichbinleise 12/1000
# Papst 4412 F/2GLL
# Papst 4412 F/2GL
# Papst 4412 F/2GL + NMT-2
# Revoltec AirGuard
# Scythe S-Flex SFF21D
# Scythe S-Flex SFF21E
# Yate Loon D12SL-12
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Old 31st March 2006, 15:30   #2
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copycats
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Old 31st March 2006, 15:36   #3
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they used this device for dBA measurements: http://www.atp-messtechnik.de/messte...-264-plus.html

2000+ - range of 15-140dB.


They state they are not in a special noise room, but still the noise readings list <20dBA values.. wtf?


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reading results from tables is not too user friendly in my humble opinion
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Old 31st March 2006, 15:43   #4
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no mention of ambient noise and they measured 11dBA for the Scythe "D"... uh?
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Old 31st March 2006, 15:50   #5
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Can't believe a single data point from them.
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Old 31st March 2006, 16:03   #6
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quite good actually

they explained a few things very well and the maintenance tips are good as well


Their dba readings are adjusted to the human hearing capabilities, that might explain the results from Scythe. They tried to do something like AC does with the rating in sone.


Biggest issue is, the test did not allow large discrepancies because the airflow in the case was too good and the Northwood is not taxing enough.


Still, Scythe seemed to gain the critical knowlege from their cooperation with AC that fans matter a lot. If they start supplying the the E version of their flex fan with their coolers, the competition has to be very affraid.
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Old 31st March 2006, 16:18   #7
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comparo time!
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Old 31st March 2006, 16:21   #8
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More nonsense from Rutar.

http://www.eie.fceia.unr.edu.ar/~acu...e/soundlev.htm

Unless that guy lives in a broadcasting studio.
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Old 31st March 2006, 17:42   #9
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The sound pressure level has the advantage of being an objective yet a handy measure of sound intensity, but it has the drawback that it is far from being an accurate measure of what is actually perceived. This is because the ear's sensitivity is strongly dependent on frequency. Indeed, whearas a sound of 1 kHz and 0 dB is already audible, you need to raise up to 37 dB to be able to hear a tone of 100 Hz. The same holds for sounds above 16 kHz.

directly from the link, they did an adjustment according to the frequency of the sound (and unless you can read German, it might have gone missing in the translation)

both the madshrimps and the other results are correct, both times a clear description is given how they were achieved
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Old 31st March 2006, 18:16   #10
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there are still some things not quite right, if you look at the Turbine 1000 vs Papst at 12V

*in their test the Turbine cools better than Papst, is louder than Papst and spins slower.
* in my test the Aerocool cools less than Papst, makes less noise and spins slower.

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