The drums are on a concrete slab, not a floor. I'm not certain how bass travels through that.You are probably suffering from “conduction” if your bass drum isn’t isolated from the ground. Sound travels easier and further trough solid than through air ( think about hearing a train miles away by putting your head on the rails).
So take a look at putting your drums on a floated platform. Those tennis ball ones are pretty effective and cheap to build. The more mass you can add to the platform the better.
That’s probably the most annoying part of drumming. At least with me, I spent years waiting for nice gear, got them and they turned out so much more focused and responsive, they went through the walls even more. Who cares if you have to muzzle a Sponge Bob kit, but anything nice just hurts. Craviato and I’d have to open the windows!Disturbance! oh sorry I can't hear you knocking!