I feel your pain as my gas boiler is right next to my dedicated listening room in the basement. Sucks. See the link below for Premier Home Theater by Earl Geddes and you’ll get some very approachable and effective options, specifically in chapter 11. My knee-jerk response would be to install two different thicknesses of Sheetrock bonded together with Green Glue and maybe even install resilient channels — depends on how serious you wanna get about this, but those are only two of many ways to attack this. Best of luck.
Insulation between floors - how affective?
My home theater System is in a room on top of a hot water baseboard heating system in the basement. So every time the boiler fires up and the pump is circulating water I can hear it. Very annoying. Also my air conditioner compressor sits on the other side of the exterior wall but not much I can do about that.
Anyone use insulation batts to stuff in the basement ceiling rafters to deaden sound. Rockwool/roxul has some sound reducing insulation batts that looks interesting.