In this lesson
Hard panning does not cure masking
Panning changes where a part comes from, not which bands it fills or when it plays. The help shrinks on speakers and disappears in mono, where the parts collide again.
· 7 min read · Lesson 7 of 44 in Mixing & Mastering
In short
- Judge separation on speakers and in mono as well as on headphones, because hard panning keeps two parts out of each other's ear only on headphones.
- When two parts still collide in mono, change what they play first: register, voicing or rhythm, then EQ the overlap.
- Check which pan law your DAW uses, since with a common -3 dB law every hard-panned part drops 3 dB against the centre in a mono fold.
In this lesson (8)
The wide chorus that turns to mush
Two rhythm guitars, same chords, same amp, same strumming, one panned hard left and one hard right. On headphones the chorus is wide and the vocal sits in a clean gap in the middle. On the monitors that gap is narrower. On a kitchen speaker the guitars turn into one fizzy block and the top of the vocal disappears into it.
Headphones keep each guitar in one ear. On monitors both ears hear both guitars, and a single kitchen speaker plays everything from one point, so both guitars and the top of the vocal reach each ear in the same frequencies at the same moments.
Why it matters
Panning moves one cue out of several
happens when two sounds put energy into the same auditory bands at the same moment, and the louder one sets how loud the other has to be to stay audible. That is decided band by band, as the lesson on buried vocals works through. Panning changes none of those bands and none of those moments. It only changes which speaker each part comes out of.
Location still counts. It is one of several cues the ear uses to sort a mixture into sources, along with when notes start, pitch range and (Bregman, 1990), and together those cues decide what the listener follows. Two guitars that differ only in location lean on one cue, and that cue depends on the playback system.
The science
What each ear receives
On headphones, a hard-left guitar reaches the left ear only. The right ear hears the vocal and the right guitar, with no left guitar on top. That is a large separation, and it is why a crowded arrangement can sound tidy while you mix on headphones.
On speakers both ears hear both speakers. The hard-left guitar reaches your right ear too, a fraction of a millisecond later. At high frequencies the head shadows it and it arrives quieter; at low frequencies the head is small compared with the wavelength and barely shadows it at all (Moore, 2012). So one ear may have a cleaner view of the vocal in the highs, and the brain can use the timing difference between the ears to pull out a little more. In one lab study with virtual sources, listening with both ears instead of only the better ear lowered the level at which sentences were understood by about 2 to 4 dB against a single interferer (Hawley, Litovsky and Culling, 2004). That is real help, and it is about the size of a modest move. It is a speech test under lab conditions, not a mix, so treat it as a rough scale.
In mono the help is gone. Every part comes from one point, and only the non-spatial cues are left to separate them. The fold also changes the balance by an amount the pan law decides. With a common -3 dB law, a centred part sits at in each channel and a hard-panned part at 1 in one channel. Folded as :
So in mono the hard-panned guitars drop 3 dB against the centred vocal. If the vocal is still buried with that 3 dB in its favour, the clash is in the parts themselves.
Separation also depends on what the parts play. Sounds whose notes start together tend to fuse into one source, and sounds whose onsets differ tend to split (Bregman, 1990). Two guitars strumming identical chords on identical beats are built to fuse. That is often the goal with a double-tracked part, and it means the pair behaves like one wide guitar that competes with the vocal as a single block.
The demo below frees a lead from a pad in the same range without moving either one in the stereo field: it cuts the pad in one band or ducks it while the lead plays. Both fixes change the pad itself, so they would hold in mono too.
Listen
Free a lead from a crowded pad
A lead and a bright pad share the same range. Cut the pad or duck it under the lead and the lead comes forward without getting louder.
Loading demo…
Start with your speakers or headphones low.
Try it
Take the panning away and see what is left
Use a dense section with at least two similar parts panned apart and a centred lead.
0 of 6 steps done
Then check mono again. If the parts hold apart there, the stereo version will often sound wider than before as well, because the parts now differ in more than location.
Common mistake
Solving a crowd with width
When a chorus feels cluttered, the reflex is to pan things further out or add a stereo widener. On headphones that seems to work. On speakers the gain is smaller, and in mono it is zero, while the overlap in the bands and the beats is exactly where it was. The lesson on mono shows how some width tricks also cost level when folded.
The opposite mistake is to stop panning. Hard panning is fine. Two guitars hard left and right with different voicings get the benefit of both.
Takeaway
Roles first, then the map
Decide what each part's job is, give it a register and rhythm of its own, and set a balance that works in mono. Then pan, and let the stereo image spread out an arrangement that already makes sense. If you mix on headphones, check every crowded section on speakers and in mono before you trust the separation you hear.
Masking
One sound making another harder to hear, usually because they share frequencies at the same moment. A loud sound also masks what follows it for a short time (forward masking). The quieter sound is still there; the ear stops separating it.
Timbre
What lets you tell two sounds apart at the same pitch and level: the balance of harmonics and noise, and how they change over time.
Hearing safety and educational use
The physiological and acoustic ideas in this article are for music production and learning. They are not medical advice, diagnosis or treatment. Loud monitoring and long sessions can damage hearing, so keep levels moderate (around 80 to 85 dB SPL or lower) and take breaks. If you notice ringing, discomfort or hearing changes, see a licensed medical professional.
3 questions
Check yourself
Sources
Show all 3Hide sources
- Bregman, A. S. (1990). Auditory Scene Analysis: The Perceptual Organization of Sound. MIT Press.
- Hawley, M. L., Litovsky, R. Y., & Culling, J. F. (2004). The benefit of binaural hearing in a cocktail party: Effect of location and type of interferer. The Journal of the Acoustical Society of America, 115(2), 833-843.
- Moore, B. C. J. (2012). An Introduction to the Psychology of Hearing (6th ed.). Emerald.
Next lesson · 8 of 44
EQ is attention designBoost the presence range on every track and nothing stands out. Use EQ to build contrast, so the part that matters is the one the ear can follow.
Written by Virzy Guns
Songwriter and producer, founder of Virzy Guns Production. Now building HealingWave.