When I was an impecunious undergrad I obtained some funds by signing up to be an experimental subject. One experiment I recall fondly was concerned with hearing and took place in an anechoic chamber in the basement of Toulmin Hall (at Cal). After one was acclimated to the near absolute silence, one was fitted with some truly wondrous Koss headphones and the experiments began. The anechoic chamber was never locked.
I soon began using it just to sit and listen, and to think, ponder, meditate and the like. One would hear not only one's heartbeat and breathing, but, after a while, the sound of air molecules bouncing off of one's ear drums. I pondered many things in there, and many times just sat and listened to the universe.
I suggest that if you really wish to hear, to think and to understand, that you should seek the very opposite of an echo chamber.