Frequency & Depth Notes

Core idea

Real world lightning: close strike has crack and highs, distant strike loses the crack and highs, only low rumble survives
High frequencies are small fast oscillations, burn energy quickly, run out of gas fast
Low frequencies are long slow oscillations, carry weight and travel farther (pebble vs boulder in a lake)
Bright and full sits up front, dark and thin sits in back, everything in the mix lands somewhere on that line

Low mids and body

Low mids create the feeling of “in the room with you,” it’s felt in the chest, not just heard
This is why a vocal warms up when a singer leans into the mic
Losing low mids makes a sound feel farther away even if the low end is technically still there
Two matching signals: rolling off highs AND thinning low mids both say “farther away” to the brain

The backing vocal trap (personal example)

Push backing vocals back with fader, then miss the presence, so boost highs to bring air back
Brighter backgrounds start stealing attention from lead
Lead gets brightened too, cycle repeats, ends in harsh brittle top end and vocals still fighting
Root problem: never touched low mids on the backgrounds, so they kept the same chesty weight as the lead and fought it for proximity
Lesson: fader said “back” but EQ said “front,” conflicting signals mean the sound doesn’t land anywhere clearly

Height vs depth (connects to Mix Cube from week 1)

Height = where a sound lives on the frequency spectrum (bass low, cymbals high), set mostly by production/sound selection, mixing can only nudge it a little
Depth = comparing two sounds against each other, it’s relative, not a fixed spot
Rolling off a cymbal’s top end to sit it behind vocals doesn’t change its height (still a high frequency instrument), it just changes how much of its own brightness it keeps relative to others
Nothing is “removed” from the mix’s character, sounds are just slotted behind each other (the “pop-out book” effect)

The pass, step by step

Pick one background element, play it against the front element unsoloed (depth only exists in comparison)
High cut first: shelf filter around 8k-10k, pull until it steps back, not until it goes dull (different points)
Check the gap between front and back element. Not enough separation? Pull more from the back, or walk the shelf down further, don’t push the front element up
Work low mids too: filter roughly 200Hz-400Hz out of the background so it stops crowding the front from underneath. Advanced move: sidechain a dynamic EQ band to the focal point so low mids duck only when needed
Bypass everything and listen. Should collapse flat, then open back up on enable. No collapse means not enough was moved

Watch outs

Don’t mistake dull for distant. If something’s dark but still feels close/on your chest, that’s a level issue, not frequency, fix volume first (this is why levels come before EQ)
Don’t chase contrast by brightening the front. Depth is a gap you can open from either side, but pulling from the back is free while brightening the front costs your whole mix’s top end

Today’s exercise