Distortion adds new upper harmonics that EQ cannot create when a sound is too thin

EQ can only rebalance frequencies already present, so it is powerless when a sound lacks upper-harmonic content or its harmonics are too sparse to feel full at a workable boost. Distortion — widely used in pro mixing, largely ignored in small studios — generates new harmonics related to the fundamental, increasing harmonic density so a region stays solid without individual frequencies poking out. It is especially useful for making bass audible on small speakers.

Examples

A dull synth bass with a filtered-off top end: light saturation generates harmonics in the 200–500 Hz range so it reads on laptop speakers that cannot reproduce the fundamental.

Assessment

Explain why distortion solves a problem EQ cannot when a sound lacks upper-harmonic density, with a bass example.