Hello,
I have quiet neighbours next door (mid-terrace) but in the evenings we can hear their TV and it has an annoying interference when we are also watching TV. Not the neighbours fault - they are watching TV at a normal volume, it's just the poor construction of the party wall (built about 1895). We are wondering about soundproofing options just to make this a bit quieter. We don't need to worry about impact noises, just the airborne noise of a TV. We also don't need to necessarily completely remove it, just dampen it so we can't hear it simultaneously while watching our TV. Would prefer not to build a stud wall and lose space... would plastering over soundproofing plasterboards be effective? We will be plastering soon anyway!