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.
Soundproofing tape door.
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.
White doors windows insulation tape 2 rolls 1 2 inch wide x 1 4 inch thick foam weather stripping gasket tape seal for draft soundproofing total 30 feet long 2 x 15 ft each 4 8 out of 5 stars 14 11 98 11.
Adhesive foam tape 3 rolls 1 4 inch wide x 1 8 inch thick high density sound proof insulation closed cell foam seal weather stripping for doors and windows total 50 feet long 16 5ft x 3 rolls adhesive foam tape 3 rolls total 50 feet long 1 2 inch wide x 1 8 inch thick insulation soundproofing neoprene rubber door weather stripping 3 x.
Generally you should stick with the pillowy kind if you re soundproofing interior doors and rubber sweeps for exterior ones.
Soundproof door sweeps are items you attach to the bottom of your door to bridge the gap between it and the floor.