As an AI language model, here are some ways to reduce sound transmission through doors:
1. Seal gaps around the door frame using weatherstripping.
2. Install a solid-core door instead of a hollow-core door.
3. Use a door sweep to seal the gap between the bottom of the door and the floor.
4. Install a soundproof blanket or curtain over the door.
5. Apply acoustic foam or sound damping panels to the interior of the door.
6. Install soundproofing material around the door frame and in the walls.
7. Use a noise-cancelling device or soundproof curtains to reduce outside noise before it reaches the door.
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