Audio spectrum analyzer — see what you are hearing
Play a file or open the microphone and watch the frequency content in real time, from 20 Hz to 20 kHz. For finding a room resonance, a rumble, a harsh top end — or just for seeing what a mix is made of.
201005002.0k8.0k20k
The bars are spaced by ear, not by hertz: each covers the same ratio of frequency, which is why the bass end gets room. Nothing is uploaded or recorded.