A door having acoustical sound isolation properties includes a rail or stile having surfaces with a first, second and third planar portions stepped inward from and parallel to each other. Blocking layers are disposed parallel to and below one of the door surfaces, with each blocking layer having an edge with an extending flange contacting and extending along the second planar portion of the third surface of the stile or rail. The flanges of the blocking layers restrict movement of the layers toward each other. Soft acoustical material is disposed in the door interior. Flexible transition layers extend along the stile or rail third planar portions and extend over the blocking layers and the soft acoustical material to provide support against denting forces to the door.

A door having acoustical sound isolation properties includes a rail or stile having surfaces with a first, second and third planar portions stepped inward from and parallel to each other. Blocking layers are disposed parallel to and below one of the door surfaces, with each blocking layer having an edge with an extending flange contacting and extending along the second planar portion of the third surface of the stile or rail. The flanges of the blocking layers restrict movement of the layers toward each other. Soft acoustical material is disposed in the door interior. Flexible transition layers extend along the stile or rail third planar portions and extend over the blocking layers and the soft acoustical material to provide support against denting forces to the door.

A soundproof door is disclosed to has a multiple-layered core to form a concrete inner portion of the soundproof door, the multiple-layered core due to particularly constituted by having a soft-soundproofing core interleaved in between two spaced hard-soundproofing cores to form as a whole as a sandwich structure are excellent in sound isolation for soundproof door, and the soundproof door at least has an STC of 30, determined in accordance with ASTM E413-10 and E90-09, to minimize the transmission of sound from one side of the soundproof door to the other side.

Aspects of the present disclosure describe a rechargeable door that includes at least one internal rechargeable battery and at least one further DC component powered by such rechargeable battery, wherein the at least one internal rechargeable battery is configured to be recharged via a physical connection, such as wired connections, or other contacts such as magnetic contacts or pogo pins or spring contacts, in the door via a second rechargeable battery or via wireless recharging, for example magnetic inductive or resonance charging, via placement of the second rechargeable battery on or within the door.