I'm well underway building my new cinema room and would like some advice on accoustic insulation for my ceiling. There is going to be a bedroom above and I would like to keep sound from bleeding through. I also want to make the cinema sound as tight as possible by minimising vibration in the airspace between the joists. The ceiling is of standard construction consisiting of 200x75mm at 400 centres timber joists and plasterboard ceiling. Any help appreciated regarding insulating materials and recomended sources.