Soundproof doors are specially designed doors that help reduce the transmission of sound between rooms or from outside to inside. They are often made with dense materials and have seals around the edges to block noise effectively. These doors are commonly used in recording studios, home theaters, and office spaces where privacy and quiet are essential. The effectiveness of a soundproof door is measured by its Sound Transmission Class (STC) rating. A higher STC rating indicates better sound insulation. Installing a soundproof door can significantly improve the acoustics of a space, making it more comfortable for activities that require concentration or relaxation.