Low volume in left earbud

hey, bit late but i have try this tuto https://www.youtube.com/watch?v=eJrxpUI8...
its for buds +, basically the same thing but the filter is in the tips

removing the grid is still a good idea, i have found most of it was blocked with earwax, its not perfect, i still need to balance the sound to the left but it work way better than before

also try washing the 2 other grid on the buds, mine was pretty dirty, don't really know what it does but cleaning it can't make it worse