No actual experience in sound proofing but have done some research for the room I’m planning on turning into a studio.1 thing I have learnt from my speakers in the lounge which are big floor standing ones ,is that placing speakers on a acoustic tile or plate can stop the bass being transmitted through the floor to other rooms or neighbours without affecting the sound IN the room. Also depending on cash flow there are several options from foam type sound proofing to acoustic plasterboard. I think I’m going to go with the foam type tiles as my equipment is going to be in a room specifically for dj/studio work but could see this not being ideal if your equipment is in shared area or your lounge.