Placement is key! I have an SVS PB10-NSD and no matter where I put it, I keep getting a null in some frequency range. I play that song Kid Cudy - Mr Rager where there are 3 bass drops that extend from the low range to the higher range, and in this new house I'm in, some of the notes disappear, it's not continuous. I'm thinking adding a 2nd sub would help me here, but I really want to upgrade to a 15" as well lol