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Microphone placement for an acoustic guitar begins with understanding the instrument’s tonal map: the top plate’s resonance, the sound hole’s projection, and the neck’s brightness. Start with a single small-diaphragm condenser around 6 to 12 inches from the 12th fret, angled toward the soundhole but not directly inside it. This position tends to capture the string balance and body resonance without harshness. If the guitar has a pronounced bass hallmark, you can move slightly toward the neck to emphasize warmth, then adjust height to avoid extra string buzz. Always monitor in context with your room’s reflections.

A second approach uses a matched pair for stereo capture, such as a XY or AB configuration, to preserve spatial cues in the performance. Place the mics above the guitar’s top plate, around 8 to 14 inches apart, angled to meet near the saddle area’s projection. The aim is to blend string articulation with body resonance while minimizing low-end buildup from room symmetry. Use cardioid capsules to minimize rear reflections, ensuring the signal remains clear and coherent when panned. If you’re mixing with a guitar amp or close-miked percussion, the stereo field should remain natural and not overly wide.

The distance between microphone and guitar dramatically shapes tone. A closer position (4 to 8 inches) yields more attack and brightness, as high-frequency content becomes more pronounced. A farther position (12 to 18 inches) blends body resonance with string detail, reducing glare but potentially picking up more room coloration. The best practice is to audition several options, recording short test takes to compare how each position interacts with your room’s reflective surfaces. In small untreated spaces, leaning toward a slightly farther sweet spot can yield a smoother, more natural balance. Record dry first, then reference in context with a click or performance.

Room acoustics heavily influence how the guitar sits in a mix. If possible, dampen flutter echoes with Strategic absorption behind the guitarist and behind the microphones, while leaving a touch of reflective surface to preserve air and presence. A small sofa or thick carpet can soften high-frequency build-ups without dulling the instrument. Adjust mic angles to avoid direct sound from the soundhole when necessary, as that can produce boomy or nasal results. Use a high-pass filter gently during mixing to remove rumble from far-field reflections, prioritizing the guitar’s natural brightness and body resonance.

If the room’s character is desirable, consider a spaced pair with a wider 60–90 degree angle and a distance of 1–2 meters from the instrument. This setup can capture authentic room ambiance and body resonance, producing a sense of space that closely mirrors a live performance. The goal remains balance: let the strings sing while the body contributes warmth and depth. Use a gentle compression approach so the dynamic range isn’t exaggerated by proximity. In post, avoid heavy reverb that muddies the guitar’s natural acoustics; instead, rely on the room’s existing ambience to add depth.

A mid-side (M/S) configuration offers flexibility when you want control over width post-recording. Place a figure-eight mic to capture the room’s side info, with a cardioid mic in front for the center signal. The M/S setup provides a natural sense of space, allowing you to adjust the stereo width during mixing without re-recording. Ensure proper alignment so the cardioid captures the instrument’s focal point while the figure-eight records ambiance evenly. Edit in the DAW by decoding the mid and side channels, and then listen in mono to confirm phase coherence.

Phase relationships matter a lot with multiple mics. If you notice abrupt phase cancellation when you move the guitar, try flipping the polarity on one mic, or slightly adjusting the mic positions by a few inches. A common technique is to set the first mic near the 12th fret and the second mic near the neck, then reverse the second mic’s polarity if comb filtering becomes audible. Listen in mono to verify coherence across the spectrum, paying attention to the low end and midrange. Subtle tweaks here can preserve natural balance without introducing dullness or nasal artifacts.

When aiming for a natural take that translates well on various listening systems, consistency is key. Record a short phrase with your chosen placement, then listen on headphones and on small speakers. Note how the guitar’s brightness and body warmth translate, and adjust the mics accordingly. If you’re tracking a guitarist with a bright instrument, you may want to back off the proximal emphasis slightly and search for that sweet spot where string clarity remains intact but without undue sheen. Re-check references with a well-known recording to guide the final configuration.

For a deeper, more intimate tone, position a second mic closer to the neck area, around the 7th to 9th fret but slightly above the strings. This position increases warmth and reduces brightness, especially on guitars with bright tops or brighter strings. Combine with a distant mic to keep the overall balance natural. The key is to avoid doubling immediately identical cues; instead, allow one mic to emphasize texture while the other contributes overall body. Use gentle EQ to carve any buzzing overtones or harshness while preserving string presence.

When capturing darker or mellower guitars, you can experiment with a vertical angling approach, where one mic points slightly downward toward the top plate. This helps emphasize the guitar’s midrange and reduces sizzle from treble-responsive strings. The other mic, positioned higher and more toward the bridge, can deliver a subtle shimmer that resembles a blend of strummed and plucked tones. Keep levels matched so neither mic dominates. In post, you may add a touch of brightness to the higher mic’s track if the mix feels dull, but avoid overemphasizing that top-end.

A practical routine to develop a reliable mic setup is to standardize a base position that works well on most guitars, then keep a note of adjustments per instrument. Start with a small-diaphragm condenser at about 10 inches from the 12th fret, angled toward the body, and a second mic (if used) at a slight angle near the neck. Record a short, consistent phrase weekly with this base; then, when you encounter a guitar with unusual resonance, you can nudge the mics in small increments and document outcomes. This discipline reduces trial-and-error time and leads to repeatable, natural sounds.

Finally, document the room’s contribution to the guitar’s tone. Note the wall materials, ceiling height, and furniture layout, as these factors subtly color the sound. If you’re in a room with strong flutter or standing waves, position a portable absorber behind or to the sides of the guitarist to tame harsh reflections. Train your ears by comparing mono and stereo results, ensuring the tonal balance remains intact when the track collapses to mono. By combining thoughtful mic placement with consistent room treatment, you’ll produce acoustically honest recordings that endure across genres and eras.