Think about it as up to four different compressors which can each act on a narrow portion of the frequency spectrum. If you have a signal or a piece of audio where just one portion of the frequency spectrum has too much dynamic (too much difference between loud and soft parts) as opposed to the whole waveform, you'd use the Quantum to target it and correct it. An example would be a vocal track with too much sibilance (the "s" and "t" are too loud and distracting). Those sounds occupy a specific portion of the frequency spectrum (5-6 kHz for males, 7-8 kHz for females). You'd want to reduce their loudness when they peak without touching the rest of the vocal. A Quantum could do exactly that. Another way to understand the Quantum would be to imagine it as a dynamic EQ that can attenuate up to four frequency ranges whenever their loudness pass a certain level.
so country lol "qauntum""