Confining serious low end to the fewest tracks keeps the bottom controllable

Every non-bass track contributes some low-frequency energy that accumulates into mud and lost headroom. Restricting serious low end to as few tracks as possible (ideally a dedicated bass/sub part, high-passing the rest) makes the bottom octaves simpler to monitor and meter, and lets you correct overall low-end weight later with mastering-style processing without wrecking other instruments’ tone or the mix’s clarity. The cost is a little sacrificed low-end nuance.

Examples

High-passing piano, guitars, and overheads so only the bass and kick carry sub energy tightens the low end and recovers headroom, while leaving weight adjustable at the master stage.

Assessment

Explain why confining low end to few tracks improves both monitoring and post-mix correction of the bottom end.