[mythtv-users] Ahanix D.Vine cases

[Maarten van den Berg]

On Wednesday 21 April 2004 22:40, Paul W. Smith wrote:
> > >Well, I DO know about those cases NOW; and I would strongly suggest that
> > >nobody believe the dB sound values this company quotes for its fans and
> > > PSUs! They quote 14 dBA on their website. This is -and anyone knowing
> > > how the dB range works will attest this- an utterly impossible value.
> > > No PSU can ever have a noise level 14 dBA unless they have no fan at
> > > all (passive cooling) but even then, no-one will be able to measure
> > > said 14 dBA soundlevel.
>
> What if they had a fanless PSU and they did their testing in a sound-proof
> chamber (as anyone testing the noise output levels of a device should)?

The photo clearly shows a fan...  So that kinda makes 'fanless' impossible.
I concede that a soundlevel of 14 dBA might theoretically be possible however 
highly improbable. I looked at the spec sheets of Papst fans (widely regarded 
as one of the worlds' most silent fans) and indeed, some of their ultra 
low-rpm fans are in the range 12dBA-22dBA. But this still leaves two 
problems: will a 1500rpm fan provide enough cooling, and how much extra noise 
is produced by the airflow-inhibiting parts of the PSU itself.  In my mind, 
that makes the Ahanix claims somewhat less-than-believable (but possible).

Overview sheet of Papst' quietest 80mm fans:
http://62.159.30.76/en/pdf/produkte/8412_NGLE.pdf

Maarten