Then seal the gaps with a door gasket door sweep or spray foam to prevent air leaks.
Soundproofing door panel.
These panels offer a step up from gluing a sheet of plywood to your door but they re not generally as expensive as high end solutions like fiberglass soundproofing blankets.
Sound absorbing acoustic insulation wall panels 2 pack model 02520 view the owens corning sound absorbing acoustic panels.
Magnetic door gaskets only work on doors which are built into metal frames so they aren t a suitable method of soundproofing for most doors.
If adding many soundproofing elements to your door seems like too much work try adding an acoustic door panel.
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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.
Acoustic door blanket panels overlap the door and extend beyond the frame to prevent acoustical leaks.
If you are willing to change your doorframe to a metal one then this is a very effective door sealing method which will make a huge difference to the sound resistance of your door.