How loud should the Dual core 2GHZ machines be?

I just purchased the dual core 2GHZ last night and after reading so many people say these were so quiet, I was expecting quiet.
I have to agree this is much better than my dual 867 G4, but I wouldn't call it quiet. I am using it for audio and was so excited that thay finally found a way to make them quiet. I am now disappointed.
Does anybody know what the normal db rating is for these and where I should be tested as far as where I should be placing the noise level meter to see if this is within specs or if I got a bad one.
Any help would be great.
Thanks

I got a Dual 2 Ghz (separate processors) so I would assume mine is noisier, but I'll tell you what I've learned.
1: It seems the one PCI slot video cards are the nosiest, making the PCI slot fan/speaker combination make a lot of noise right in front of the machine where you'll hear it all too clearly. The two slot PCI video cards are quieter because of their bigger fan.
2: The Superdrive makes the most noise when a cd/dvd is in and being used.
3: The drivebay fans are set to a minimum 1000 RPMs, provided you have a cool room (-75ºF) much more over this they will kickup and make noise along with all the other fans.
4: The CPU fans are a little bit tricky, with some OS X updates "something" gets reset and then the fans will rev up and down at the slightest provocation. This can cause considerable noise and attention. Most times the fan will settle into one constant speed which is better than the annoying revs.
So it depends a lot upon where a sound reading is taken and what kind of hardware and room temps.
My Dual 2, measured from the front grill middle, no active Superdrive, in a -75ºF room, with the remaining PCI slot covers removed, gets a sound reading of 58 db at point blank range.
A eMac 800 I had was getting a constant 72 db as measured from the rear fan exhaust area. It was a vacuum cleaner in comparison to my Dual 2.
If you need absolute silence, I suggest a server box or placing the Tower on the opposite side of the wall and routing cables through a small hole. Get a external cd/dvd drive.

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