It depends on your requirements. Have you ever seen a good projector up and running before? Some make more noise than others, so depending where you're going to be sitting in relation to it will depend on whether you'll be hearing it during quiet passages. As an example, my PJ is about 2 feet away from my head, and as I use it in eco mode, I can hardly hear it, but then it does run at -17dB. Many modern PJs run louder than that because they're brighter, so need more cooling. Most 3D projectors run at -20dB or higher, which in my case would make it a no no with regards to noise. If you're further away then me, maybe BigBoss can let you know how he gets on with his, which is around -21dB. Most projectors under £1,000 tend to run nearer -27/-30dB, which is pretty loud.