When I lived in an apartment the issue I had was with my subwoofer. It drove my neighbors a little batty so I turned down the bass a tad and then put thick carpets under it. I also changed the placement a little bit. Also like Onhwy61 said what decibel level are you listening at?
Another thing to make peace with your neighbor is to maybe invite them for a listening session. Have them bring over some music they enjoy and listen together over a couple of beers.
Another thing to make peace with your neighbor is to maybe invite them for a listening session. Have them bring over some music they enjoy and listen together over a couple of beers.