One option is a solid core door with a towel placed at the bottom to block sound. In addition to this, you could install a large rotating/swinging bar on the wall next to the top of the door and hang a thick rug to cover the door when you are home.
Don't forget to put your speakers/subwoofers on spikes to decouple from the floor. Put plywood underneath to protect the floor. Lastly, consider Saturday from Noon to 6 p.m. as "no mans land" i.e. this is the time to play music louder than normal (but never loud after 9 p.m.). this goes a long way toward neighbor relations.
My two cents.
Don't forget to put your speakers/subwoofers on spikes to decouple from the floor. Put plywood underneath to protect the floor. Lastly, consider Saturday from Noon to 6 p.m. as "no mans land" i.e. this is the time to play music louder than normal (but never loud after 9 p.m.). this goes a long way toward neighbor relations.
My two cents.