[conchyjoe7]

I unfortunately had a situation exactly like that, and as is yours; it was unpleasant, but I was able to solve it. I had lived in the same unit with my then wife for 6 years and had never had a complaint either, and as you do, so did we: We kept it down to a minimum, but we lived there enjoy music and films and played them both. Then, in moves 2 very unsociable "ladies" downstairs. All of a sudden there's banging on my floor, security is called, who says (exactly like yours apparently) "I can hear it, I can hear it". So what he can hear it...that's irrelevant. What we did to solve it is we went to the manager of the property who knew us as friendly, responsible people that had never before had any complaints lodged against us in 6 years. The manager then went to the 2 downstairs and it was arranged that I would turn the system on at our normal listening level and they would be downstairs and listen to it with the manager and also to confirm that that was in fact the level we normally played at. So, it was done...The manager told the 2 "ladies" that yes, she could hear a little sound, but these were apartments and as such that is to be expected. She also told the 2 "ladies" that if they wanted to live in total quiet, that they should purchase a home, but that the level at which I was playing my music and movies was in no way offensive or obtrusive to anyone with normal demands. Never heard anymore from the 2 complainers...they moved out 3 months later and the people that replaced them never uttered a single complaint. We lived there another 2 years without another single complaint. Sounds to me like you have a malcontent next door, and I'd try what we did. Show the manager this reply (if you think it would help) along with your original post and your concerns and I think you'll get it worked out. While we're all entitled to "quiet time", we're not (in an apartment) entitled to total isolation...some people are just always miserable!
Good luck...
Cheers,
Konky.