EQing a parallel dynamics return aims the processing at specific frequency regions

Running any dynamics processor as a parallel send lets you EQ its return to aim the effect at a frequency region: a low-shelf cut on a fast parallel compressor’s return steers its added sustain toward the highs; boosting top end on a hard-compressed parallel kick adds attack “as if hit harder”. Watch for comb filtering when the EQ’d parallel signal recombines — the author uses linear-phase EQ on such returns as a matter of course.

Examples

A parallel kick compressed hard with a top-end boost, blended in only in the chorus, adds attack; a low-shelf cut on a parallel compressor return pushes its sustain toward the highs.

Assessment

Explain how EQing a parallel dynamics return makes the processing frequency-selective and the side effect to guard against.