Another quiet Nexus product....a frizzbee!

Bluefront · Post by **Bluefront** » Mon Apr 23, 2007 2:55 am

Link

"* Notice: When Nexus tested the noise level of their frizzbee they did this in an ISO-certified chamber for noise tests. It is important to know that the background noise in such a chamber is a little over 15 dB(A). These are the best possible conditions for these tests and hence you should always be aware when a manufacturer is claiming dB(A) values that are lower then 15 dB(A). Because how where they able to measure this? Nexus provide the real figures, from the actual tests. Can it get any more reliableâ€¦? Judge for your self."

Could this be the start of truth in advertising in the computer industry?

kike_1974 · Post by **kike_1974** » Mon Apr 23, 2007 4:12 am

As usual... they do not say at what distance the measure is taken. Probably at 1Km?

niels007 · Post by **niels007** » Mon Apr 23, 2007 4:14 am

Is it me or is Nexus loosing the plot? They have some new powersupplies, which are most likely decent rebranded Fortrons.. they have expensive fans which are just Yate Loons.. It seems that their only good products are the ones they don't design themselves! :S

kike_1974 · Post by **kike_1974** » Mon Apr 23, 2007 4:20 am

A question about anechoic chambers: there they say that ambient noise is little over 15dB, but reading in this article by MikeC it seems that ambient noise in these chambers is a bit higher:
"How quiet does the room have to be?
Again, it depends on how much or how little noise the test PC makes. Ideally, it should be 6 dB quieter than the noise source. Anechoic chambers are usually quiet enough to measure 2.5 bel noise sources."

So, could someone (maybe MikeC himself

) clarify what are the usual ambient noises in anechoic chambers?

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jaganath · Post by **jaganath** » Mon Apr 23, 2007 4:50 am

kike_1974 wrote:As usual... they do not say at what distance the measure is taken. Probably at 1Km?

If it's the same as for their PSUs, distance is 1m, same as SPCR:

http://www.nexustek.nl/nx8040_80plus_mo ... supply.htm

see illustration for test setup.

So, could someone (maybe MikeC himself ) clarify what are the usual ambient noises in anechoic chambers?

link

MikeC@anechoic chambers are well below 20 dBA, more like 15 dBA, typically. In the midband (500~3000Hz) they can be well below 10 dBA. Near 0 in the UBC anechoic chamber at 1kHz with the HVAC turn off. It's mostly in the <500Hz range that the noise level goes up. Even in an anechoic chamber, it's difficult to keep out low frequency noise from traffic, planes, heavy machinery

Slaugh · Post by **Slaugh** » Sat Apr 28, 2007 9:55 pm

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