My neighbours in the flat below me and who recently moved in as tenants have ,on a couple of occasions,played music which probably isn't particularly loud but it is clear that the stereo has the bass turned up enough to cause me annoyance . Despite her apologies to me by letter and in person along with her promise it wouldn't happen again it did happen last Saturday afternoon,evening and in to the early hours . I went to my bed around midnight to watch the TV using my corded headphones ( ear defender type) but was surprised to find that the music and singing from the flat below could actually be heard more clearly WITH the headphones on ( and TV sound normal) than without them .
How does that happen?