(Not tips. First-principles. Think in causes, not presets.)
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1️⃣ The Instrument Is a Resonant System, Not a String Source
An acoustic guitar radiates sound as a distributed vibrating body: strings excite the top, the top excites the air, the air excites the room.
The soundhole is not “the tone” — it’s a pressure vent
The top plate is the main storyteller
The room completes the sentence
🧠 Mic placement is epistemology: where you listen determines what you believe the guitar is.
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2️⃣ Distance Is a Spectral Filter
Closer ≠ better.
Too close → boominess, exaggerated low mids, transient aggression
Too far → loss of articulation, room dominance
Sweet zone (rule of thumb):
Start at 20–40 cm, then move laterally, not closer
🧠 Distance reshapes harmonic balance more than EQ ever will.
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3️⃣ Never Point Directly at the Soundhole
That’s like putting a stethoscope on a lung and calling it music.
Instead:
Aim between the 12th fret and the body joint
Or off-axis toward the lower bout
🧠 You want resonance, not turbulence.
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4️⃣ Player Motion Is Modulation
The guitarist is not static.
Head movement = spectral automation
Body sway = phase modulation
Picking angle = transient redesign
👉 Lock the player’s posture before locking mic position.
🧠 Most “inconsistent tone” is biomechanical, not technical.
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5️⃣ Strings Are Half the Instrument
Old strings don’t sound “warm.” They sound information-poor.
Fresh strings = harmonic clarity
Worn strings = collapsed overtones
🧠 Entropy is not vibe.
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6️⃣ Pick, Nails, Flesh = Different Transfer Functions
Each excites the top differently.
Pick → sharper transient, higher spectral centroid
Nails → complex noise + tone hybrid
Flesh → low-pass filtered articulation
🧠 Change the exciter before changing the mic.
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7️⃣ Phase Is Already There (Even with One Mic)
Reflections = delayed copies = invisible comb filtering.
Untreated rooms imprint static phase scars
Small rooms exaggerate low-mid cancellations
🧠 If the guitar sounds “hollow,” it’s geometry, not EQ.
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8️⃣ Compression Is Not for Fixing Dynamics
Acoustic guitar dynamics are meaningful.
Compress only if it serves intelligibility or density
Prefer slow attack, musical release
Or better: ride the fader like a human
🧠 Dynamics are syntax, not noise.
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9️⃣ Stereo Is a Choice, Not an Upgrade
Two mics = two truths that may disagree.
Mono → coherence, intimacy
Stereo → width, but phase risk
If stereo:
Think time alignment, not symmetry
🧠 Width without coherence is illusionary depth.
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10️⃣ Record the Intention, Not the Guitar
Ask silently:
Is this percussive? intimate? narrative? rhythmic? harmonic?
Then:
Place the mic where that intention exists naturally
🧠 The mic doesn’t capture sound. It captures intention filtered through physics.
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Final axiom
> An acoustic guitar recording fails not because of bad gear,
but because the engineer listened with concepts instead of ears.
🎧 Move the mic. Then move it again. Then stop when the guitar tells the truth.
