Below: Close up of a computer monitor, from Space Cowboys (Blu-ray), left to right HD700, Sony VPL-HW15, Epson Home Cinema 8500UB, second row: JVC DLA-RS25 and Mitsubishi HC3800. The HD700 holds its own against most, but not a few of the sharpest DLP projectors.
HD700 Audible Noise
The Cinetron HD700 is pretty quiet to begin with, and even better, lower pitched than most projectors. From a spec standpoint Cinetron says 24 db. What they don't say, is if that's lamp on high or low brightness. Usually when there's just one spec, it's the low power spec.
I wouldn't worry about it, though, the projector is quieter than my JVC, and I think, any of the other LCoS projectors, and quieter than the Epson UB projector, as well as any of the competing DLP projectors.
Bottom line, below average noise levels, and thanks to low pitch, extremely unlikely that noise will be a problem for you. If you find the HD700 too noisy, that probably means you wouldn't be happy with 75% of the home theater projectors on the market.