If you want to do serious listening and can't have all the room treatments you'd like, you can also use "portable" acoustic treatment panels. This way, your room won't be permanently covered with bass traps, etc. Ethan makes stands that hold his bass traps, etc. So, you could pull out all the room treatments (that you don't want to permanently mount) and place them when you're ready to listen.
Not always a super-convenient method, but helps when traffic flow, etc. won't allow you to have stuff in place all the time.
Lee
Not always a super-convenient method, but helps when traffic flow, etc. won't allow you to have stuff in place all the time.
Lee