Question about Sound Isolation/Reduction and Heat

Hi all,
My AGP Sawtooth G4 tower is loud
-OWC 1.4 Ghz upgrade w/ fan
-8500 vid card w/ fan
-OEM fan
-Seagate Barracuda 160 GB (loud!) + two other HDs.
i haven't measured the decibel level, but it is significant.
I do some home-audio-recording, and I want to know if I build/use an enclosure to seal in the noise, will excessive heat be a problem.
thanks in advance
Sawtooth g4 Mac OS X (10.4.6) 1.4Ghz upgrade, 896 ram

re: the amount of noise reduction...any would be great. Didnt know it (or think about it) when i bought it, but the upgrade Seagate Barracuda HD is apparently notorious for being pretty loud. then throw in the 1.4 Ghz OWC processor upgrade (has a fan instead of a heatsink on the chip). those two + the stock fan crank some noise.
the tower is in a computer desk now (cheap officemax type command center) - in the 'computer spot' behind a door. i'm tempted to just seal the box and put up soundproofing foam inside...but heat becomes a concern. i'll look into a fan, that seems like the logical(smart?) thing to do.
Sawtooth g4 Mac OS X (10.4.6) 1.4Ghz upgrade, 896 ram

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