TIP 2: THE DOOR
Simply closing a door does not always have the desired effect of "blocking out" disturbing noises. This is because doors are often hollow inside, allowing sound to pass through easily. A hollow door can be replaced with a high-quality soundproof door, which significantly reduces noise levels.
The "sound leak" can also be at the bottom of a door. Living without thresholds is very popular—not only because it looks aesthetically pleasing but also for practical reasons such as easier cleaning and reduced tripping hazards. The only downside of not having a threshold is that the door does not properly seal against the floor, allowing sound to pass through easily.
This can be resolved by installing the EllenMatic Soundproof drop seal at the bottom of the door. The flexible drop seal ensures a tight closure of the gap. An added benefit is that it not only blocks out noise but also unpleasant odors, drafts, smoke, and even fire.