Top Signs Your Mix Isn't Ready for Mastering | Are You Listening? Season 6, Ep 4

Main ideas: How to tell when a mix is ready for mastering

Speaker Jonathan Wyner shares practical “signs” to evaluate before moving on to mastering. Whether you’re mastering yourself, sending to another mastering engineer, or judging a mix inside a mastering chain, the key is to temporarily bypass any mastering chain so you can judge the raw mix more accurately.

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Detailed checklist / methodology (what to listen for, measure, and adjust)

1) Re-check balance using references (but don’t match their loudness blindly)

• Compare your mix to genre-appropriate reference tracks to judge overall balance and placement.
• Important: If your references are already mastered, they may sound “hot” (louder/brighter).

In your comparison session:

• Turn the reference tracks down as needed.
• Aim to match the vocal position (lead vocal level) between your mix and the reference.
• Then observe the relative balances across the rest of the track.

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2) Check lead dynamics across the song (“needle drop” gain-staging risk)

Do a “needle drop” gain-staging check in your DAW by dropping playback at key points:

• Intro
• First verse
• Second verse
• Second chorus
• Outro

Watch for large level changes in the lead instrument (often vocals). If the vocal/lead level changes by roughly 6–10 dB from beginning to end, you may be setting up a difficult mastering session.

Why it matters

• Mastering dynamic range compression usually won’t reliably fix mixes where quieter sections are too low relative to later sections.
• You’ll likely need mastering to reimagine gain staging from start to finish.

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3) Foreground vs. background balance (can the listener hear support?)

Confirm whether the lead sits correctly against supporting parts.

• Use vocals as a proxy for “lead” balance (or use lead guitar/horns for instrumental cases).

Two practical listening tests:

• Band-limited speaker test: listen through something like an old Oratone-style midrange-only speaker (no low/high).
• Quiet listening test:
  • Turn playback down so the vocal is relatively low.
  • Ask: can you still hear enough support from harmony/chord-motion instruments?

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4) Tonal balance should be “in the ballpark” before mastering

Mastering can adjust tonal balance, but major tonal problems may be hard to fix convincingly.

Musical loudness test:

• Ask whether the audience would want to listen to it loud (not just whether it “reads loud” on a meter).

Try increasing playback moderately:

• Boost by about 5–8 dB (within safe limits).
• Evaluate:
  • Does the upper mid-range “bark” at you?
  • Is it supported by low/mid-range warmth?
  • Does it invite you to keep listening, or make you want to stop?

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5) Leave headroom: check mix peaks vs. average level (RMS/LUFS context)

General expectation

• The master will typically be slightly louder than the mix, so you should leave some headroom.

Red flag scenario

• Peaks are near -3, -2, or 0 dBFS
• While average/RMS is low (around -16 to -20 dBFS, as described)

Consequences

• You may not be able to increase mastered loudness without damaging transients, rhythm, and dynamics.

What to reassess

• Drum bus behavior and transient handling
• Possible tonal balance issues
• (Metaphor used: “canary and coal mine”—peaking near zero with low average often predicts mastering trouble.)

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6) Watch for timbre conflicts in the same frequency region

A major mastering difficulty occurs when:

• Two elements share a similar spectral area,
• but have very different timbres.

Example

• Snare is dull while vocal is bright.

Mastering risk

• Processing that smooths the vocal may also soften the snare undesirably.

How to detect

• Listen across elements for overlap around ~2.5–4 kHz:
  • vocal “pointiness,” snare sharpness, kick/attack, distorted guitar edginess, etc.

Guidance

• If these characteristics are severely divergent, it’s often a sign you should fix the mix rather than rely on mastering.

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7) Control sibilance / high-frequency energy (don’t “dull” blindly later)

Because masters are often brighter (compression/limiting, exciters, etc.), check for sibilant energy in your mix:

• “S” sounds, fricatives, other high-frequency transients
• hi-hats, tambourines

If your mix is already bright, mastering may increase brightness further, making high-frequency control harder.

Recommendation

• Avoid having too much top end already.
• Be proactive rather than trying to “dumb it down” downstream.

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8) Compare RMS vs LUFS to reveal hidden bass that meters differently

Two meter concepts:

• RMS meter: raw energy measurement
• LUFS meter: loudness measurement weighted by human perception (frequency-weighted)

Why they differ

• A 1 kHz tone at equal RMS to a 40 Hz tone can measure similarly on RMS, but the 40 Hz tone will be perceived much quieter—LUFS better reflects that perception.

Diagnostic rule-of-thumb

• If RMS and LUFS are within about 1–2 dB, tonal balance is likely reasonable.
• If LUFS is much lower than RMS, the mix likely has excessive bass/subsonic content.

Action

• Re-check the low end and remove unnecessary subsonic/bass elements that reduce clarity and perceived loudness.

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9) Low-end clarity: manage transients vs sustained bass (crest factor)

Low-end clarity is described as one of the hardest mixing areas.

Ensure two low-end types are in proportion:

• Low-frequency tonal/sustain (bass)
• Low-frequency transient behavior (kick-related impact)

Mastering becomes difficult if their relationship is off.

Tools mentioned

• Use headphones for bottom-octave inspection
• Use spectrum/spectral meters to see proportions
• Use a Crest Factor indicator (example referenced: “Tunnel Balance control meter,” upper-left area)
  • If crest factor “wanders” or is very high, it suggests the transient vs sustain relationship is unbalanced

Claimed impact

• This harms clarity and loudness and can cause mastering problems.

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10) Final discipline check: remove distracting noises in the mix phase

Do a dedicated “one good solid listen” before signing off.

Goal

• Ensure there are no distracting embedded noises.

Approach

• While tiny noises sometimes can be removed later (clicks/pops/ticks), it’s better to fix issues during mixing:
  • vocal mouth clicks, breath issues, pick-up noises, etc.

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Conclusion / purpose

Wyner reiterates that these are listening and metering ideas meant to help prepare mixes for successful mastering, and encourages viewers to consult the show notes for additional resources.

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Speakers / sources featured

• Jonathan Wyner (main speaker; host/teacher of Are You Listening?, Season 6 Episode 4)
• Mentioned reference types/tools/brands (not speakers):
  • Oratone (band-limited speaker example)
  • DAW meters such as Insight (example meter readouts)
  • Tunnel Balance control meter (example crest factor display)
  • LUFS / RMS meters (general measurement concepts)