For doors solid core is best check out this sweeten post to learn more and acoustic seals can be applied to the threshold and around the perimeter of the door to fill the gaps.
Soundproofing door panels.
Owens corning paintable white fabric square 48 in.
To soundproof a door make it structurally strong enough to block noise by replacing it with a solid core door or by adding mass loaded vinyl soundproof blankets and panels to the existing door.
Use these panels to block sound leaking through any rectangular or squared opening.
Bubos marble pattern acoustic panels 16 x12 x0 4 inches sound proof padding high density bevled edge tiles soundproofing panels good for soundproofing and acoustic treatment marble marble 5.
Sound absorbing acoustic insulation wall panels 2 pack model 02520 view the owens corning sound absorbing acoustic panels.
Excellent for windows doors and openings.
A lightweight sturdy and convenient acoustical sound dampening panel loaded with high density insulation enhanced with either 1lb or 2lb density mass loaded vinyl to reduce sound transmission.
Don t forget about the small and often overlooked problem areas such as doorbells light sockets and outlets which are all sound paths.