I got an HS10 recently, and a couple of days ago I got curious and tried to figure out where the noise was actually coming from. If you put your ear next to the fan apertures on the front, not much noise comes from there. So I reasoned that the noise must be mainly coming through the case. By putting my ear against it,and turning it upside down, I came to the conclusion that the noise seemed to be coming mainly from the underside of the case. So, while it was upside down, I tried putting a few magazines on the underside, taking care not to block the ventilation holes. Sure enough, this reduced the noise coming from the projector. The reduction wasn't huge, but more importantly the character of the noise seemed to chaage, becoming less buzzy. So I'm thinking that if I put some kind of soundproofing material on the bottom it could permanently reduce the noise. I saw some stuff that might be suitable at Halfords called Dynamat, which is intended to be put inside car doors to reduce noise transmission to the interior. The alternative would be material that's made for soundproofing PCs. If you were prepared to take the top cover off, you could possibly put soundproofing material on the inside of it, however I'm not sure if there would be enough room for that (Kramer?). I reduced the noise coming from mine just by taking it off the table it was on and putting it on the floor. I guess the noise tends to get transmitted to, and amplified by, the table. I'd be interested to hear other people's comments on this.