We live in a semi. Don't normally hear much noise from next door, not the TV, BUT when he watches a DVD we can feel it, as well as hear it. It's like when you're at a concert, and you can feel it in your stomach. It's the bass. I'm friends with his DP, and asked her to have a word with him. Apparently he 'hit the roof' and doesn't see why he should turn it down, so DH asked him, and he said he can't turn it down, which is bolleaux because a friend has the same system and says the bass can be turned down.
My DH is getting well stressed about this; it kept us awake for an hour last night. What would you do?