He is likely hearing the lower frequencies. Do you use a subwoofer or have full range speakers that go low?? If so, consider monitors, ro headphones.
Of course a third and fourth option exist, as do others.... you could kill him and hope for a more understanding neighbor next, but wouldn't likely live there yourself anymore. You could move to a better soundproofed place as well...
My condo was pretty well made and had concrete walls, so my neighbors only complained when the sub was on for prolonged periods (music) they never seemed to be to bothered by it on movies.
Of course a third and fourth option exist, as do others.... you could kill him and hope for a more understanding neighbor next, but wouldn't likely live there yourself anymore. You could move to a better soundproofed place as well...
My condo was pretty well made and had concrete walls, so my neighbors only complained when the sub was on for prolonged periods (music) they never seemed to be to bothered by it on movies.