Very hard to find last noise-free places on Earth – mountain silence at sunset, high and deep in mountains.
At time of recording, there was about 30dBA “silence” (it is usual noise of your bedroom over night) – just river flowing through the gorge, crickets singing. Ravens made “noise” of 45dBA.
Hi-res audio can be fully explored only by hi-fi headphones and proper audio decoder. Furthermore, most people suffer from temporary hearing loss due excessive noise we live in – silence makes you human again !!!