Cut everything below 200 Hz from a 55 Hz note and you’ll still hear it. Your brain rebuilds the missing note from the harmonics left behind. It’s the same reason a touch of saturation keeps an 808 alive on tiny speakers.

We followed one sound from the speaker cone all the way to your cochlea. A few things that changed how we mix:

Sound travels about 34 cm every millisecond. Distance is time.
A 20 Hz wave is 17 m long. That’s why your neighbour hears your kick but not your hi-hats.
Two mics on one source can carve notches into your tone. Check in mono before you touch the EQ.
Your chair might be sitting in a bass hole. Move it before you boost.

Full breakdown here: