Yeah, sounds nice in France - here in the US noise ordinances are enforced only if the officer feels bored that day. Otherwise you're just gonna have to deal with it.
I'd like to stay on good terms with these people - they're just having fun, not acting like jerks or anything. Honestly there's only so much you can do with a subwoofer to quiet them down, by their very nature they are loud and intrusive.
If I can find a way to block the noise or muffle the noise on my end, I'd rather do that then enter a border war with next door neighbors.