The following procedure was written by Kal (the webmaster).
If you’re at all concerned about the noise that a projector will add to your home
theater, consider building a hushbox for your ceiling mounted projector.
Whether you require a hushbox is very much a personal preference. Some
projectors are fairly quiet to begin with (ex: Sony 10xx, Barco 70x, 80x, 120x,
etc.) while some others are noisy enough that pretty much everyone considers a
hushbox to be a requirement (ex: Sony 1292, NEC XG).
Regardless of the noise level produced by your projector, a hushbox will only
help to increase the dynamic range of the audio portion of your home theater. A
good thing all around. If you’ve spent a considerable amount of money on the
audio side of your home theater, you’ve probably already realized that a hushbox
is more or less a requirement to maintain that level of audio quality.
The author of this procedure (Kal the webmaster) does not recommend fan mods
in order to reduce the noise level of a projector – doing so only creates more
heat which will shorten the life of your projector. You’re best to build a
hushbox and vent it properly to keep the electronics cool.
Below are instructions for building an effective, inexpensive solution that
will not only quiet your projector, but cool it better than having no hushbox at
all. A cooler projector will last longer and drift less over time.
Since every projector model is slightly different, these instructions only
give general guidelines showing a successful solution instead of giving exact
measurements. Use your own measurements to build a hushbox that matches your
projector’s size and cooling requirements.
A big thanks to Guy Kuo of Ovation Software for some of the original ideas
and principles that were employed in these instructions.