Guitar Soundboard: 101 Guide

Published Categorized as Guitar Information

A guitar’s tone starts with its soundboard. This thin wooden top influences volume, sustain, resonance, and the overall voice of your instrument. Choosing the right guitar soundboard wood and construction is crucial, but navigating the options can be confusing, especially for beginners.

This guide breaks down the key considerations in plain language. You’ll learn how soundboards work, why material and bracing patterns matter, and how to pick the best soundboard for your preferred guitar model, tonewood combo, genre, and playing style.

guitar soundboard

Table of Contents

Materials Used in Soundboards

The soundboard, or top, is one of the most important parts of an acoustic guitar for determining its tone. Different wood materials used for guitar soundboards have unique acoustic properties that shape the instrument’s voice. When choosing a guitar, understanding these soundboard tonewood characteristics can help find the right fit.

Spruce Soundboards

Spruce is the most common and traditional tonewood material used for guitar tops. Its lightweight design coupled with stiffness offers a responsive and balanced tone across the tonal spectrum – favorable traits for fingerstyle playing. Sitka spruce delivers slightly more volume and bass than Engelmann spruce and is often seen on stage guitars. Adirondack spruce ups the ante with enhanced bass, volume and complexity suited for aggressive strummers. While spruce soundboards emphasise balanced frequencies, their crisp note separation caters to intricate techniques.

Cedar Soundboards

Compared to spruce, cedar soundboards trade some volume and headroom for sweet and smooth midrange tones. The wood’s lightweight and flexibility generate excellent resonance to accentuate warm overtones. Western red cedar tops bring out more bass than Sitka for boomy lows. Spanish cedar dials up the bright treble frequencies. While cedar summons less projection than spruce, its lush timbre complements backing tracks and complements vocal melodies beautifully.

Exotic Tonewoods

While spruce and cedar dominate the market, some luthiers experiment with exotic tonewoods for soundboards. Mahogany and koa instil a piano-like warmth and richness to the sound. Maple offers increased brightness over spruce for extra note separation. Ebony, rosewood, and other dense woods have also been used, but their heavy weight often requires construction adjustments for playability. The resulting tone varies, but exotic tops expand the tonal palette.

Design and Construction

Understanding how acoustic guitar soundboards are designed and built provides insight into their role in shaping tone. Luthiers carefully craft tops to balance responsiveness for volume with stiffness for balanced and complex voices.

Bracing Patterns

The bracing framework underneath soundboards allows vibration while preventing distortion. Lighter X, straight, and scalloped bracing patterns maximize vibration and projection. Heavier fan and crossed styles focus on rich, warm tones. Thicker woods tend to use firmer patterns. Bracing approaches change how freely the top moves when strings are played.

Thickness and Material Choices

Soundboard thickness impacts tone too. Thinner woods vibrate more freely for increased volume and treble presence. Thicker tops focus on low-end warmth at the expense of quick note decay. Alongside bracing adjustments, thickness pairs with the wood choice itself to sculpt guitars for fingerstyle intricacy or aggressive strumming. Balancing designs for musical purposes remains an important consideration. The construction techniques shape the voice.

Impact on Sound Quality

The type of wood and design of a guitar’s soundboard impacts how it sounds. Different choices change the tone and volume you hear when playing. Understanding what makes the sound helps find the right acoustic guitar.

Tone Differences from Wood

The density and stiffness of wood change how it vibrates. Lighter woods like cedar vibrate more for smooth, rich tones. Harder woods like ebony vibrate less for faster note decay and more complex sounds. Spruce and maple are balanced for versatility. The wood affects the guitar’s voice.

Volume Based on Design

Beyond the wood, structural choices also impact volume and projection. Thicker tops are louder but vibrate less. Carved bracing patterns allow more vibration for full sound. Bigger soundboards transfer more string energy for volume. How the back and sides are made changes projection too. While the best design depends on preference, construction approaches shape loudness.

Wood Grades for Soundboards

When examining the top wood on acoustic guitars, you’ll often see terms like “AAAA grade” or “master grade” used by luthiers and manufacturers. These classifications refer to the grading system for tonewoods based on visual characteristics and quality. Understanding the different levels helps decipher their impact on sound.

Master and AAA Grades

Top-tier wood grades like AAAA and AAA possess stunning visual looks and premium tonal properties. These boards exhibit straight, tight grain patterns and minimal natural defects throughout. The logs come from older, slow-growth trees to allow dense yet flexible integrity. Such elite grading ensures strong sound projection, rich overtones, and impressive complexity from fundamental notes. High-end builders rely on these levels for their customizable boutique models costing over $5,000.

AA and A Grade Wood

The next step down, AA and A grades retain highly musical performance but showcase more natural character markings. You’ll see some color variation, knots, and wider grain distribution without deterring playability. These remain excellent choices for professional instruments handmade in American workshops, showing craftsmanship in the $2,000 to $4,000 range. They balance great looks with great tone.

Lower Commercial Grades

Once you reach B or C-grade wood, cost-cutting becomes more noticeable. These economy selections display blown-out sections, irregular grain, and other inconsistencies affecting structural integrity. Large manufacturers depending on volume output might use these for sub-$500 models. However, the lower aesthetic quality and decreased acoustic potential undermine serious gigging use. Discerning what grade tops are made from aids in finding guitars matching playing goals within budget constraints.

Comparing Soundboards Across Guitar Types

Acoustic, classical and electric guitars each use specialized soundboard designs for their musical roles. Understanding key differences helps match players to their ideal instrument.

Acoustic Guitar Soundboards

Acoustic guitars are built to project volume without amplification. Their large, thin soundboards transfer string vibrations into sound energy for a loud voice. Tops are often made from responsive spruce or cedar woods to boost resonance across full frequency ranges – important for rhythmic strumming or soloing. Shaped bracing patterns allow free movement and rich tones. Acoustic soundboards also have more area above and below the waist for more projection power. These features allow nylon or steel-string models to sound bright among groups or fill small venues.

Classical Guitar Soundboards

Classical guitar tops focus more on balanced, detailed tones for fingerpicking techniques. Although spruce and cedar are popular, cypress and redwood are also used for their clarity and clarity. Tops are left thicker, with bracing patterns providing rigidity to prevent distortion when plucking multiple strings. Soundholes also tend to be smaller. These solid yet flexible designs allow intricate playing to sound warm, with singing overtones. The compact voices keep musical layers separate during complex pieces.

Electric Guitar Soundboards

Electric guitars use their mostly solid bodies rather than tops to capture string vibrations, converting movements into electronic signals through magnetic pickups. Soundboards tend to be left thicker and braced firmer to prevent feedback, allowing notes to decay faster. Spruce and maple remain common. Electric guitar soundboards aim for enough acoustic output for practice while letting amplified tones handle performing volumes. Their focused role brings versatility through effects and amps.

Key Factors When Selecting a Guitar Soundboard

Choosing the ideal guitar soundboard requires balancing your tonal preferences, playing style and instrument type. Reviewing your needs across these elements will guide you towards models matching your goals.

Determining Your Desired Tone

The first step involves deciding the specific tonal traits you wish to achieve. Spruce and cedar provide a balanced sound for versatility. Spruce offers crisp treble and tight bass while cedar furnishes smoothed-out warmth. Exotics like koa supply richness unavailable from conventional woods. Outlining the exact frequency ranges and overtones suited to your taste helps narrow options. Testing guitars first-hand can clarify preferences.

Matching Play Style and Soundboard

Your playing technique should also factor into any soundboard decision. Those focused on delicate fingerstyle work benefit from cedar’s resonance and dynamics providing nuanced control. Aggressive strummers appreciate spruce’s headroom and crisp note separation better conveying intricate riffing. And jazz players might desire an ebony top’s fast decay emphasizing articulation. Consider what sounds and responsiveness best aid your approach.

Pairing with Appropriate Guitar Builds

The guitar configuration itself also influences pairings. Auditorium and orchestra models designed for balance and detail often use spruce and cedar tops. Boutique builders testing unconventional shapes might incorporate exotic woods instead. Small parlour guitars frequently possess responsive cedar tops to improve their weaker projection. Factoring the intended guitar style prevents mismatches between the soundboard and instrument goals.

Maintenance and Care

Keeping your guitar’s soundboard in top playing condition requires some periodic upkeep:

  • Use a guitar polish every few months to keep the wood clean, protected and looking its best. Gently apply a thin, even coat across the top, sides, and back, then buff off with a soft cloth once dry.
  • Humidify the guitar to prevent cracks – consistent 45-55% humidity levels are ideal. Invest in a soundhole or case humidifier to regulate moisture.
  • Repair minor dings right away before they worsen. A touch-up marker fills scratches, while seam adhesives and clamps can fix lifted braces.
  • Stay on top of care to protect tone and playability over decades of musical enjoyment.
  • Gauging humidity, regular polishing, and timely fixes make maintaining acoustics stress-free.

Famous Guitars and Their Soundboards

Famous musicians often develop strong preferences for particular guitar models over years of touring and recording. Understanding the soundboard woods and designs behind these iconic instruments provides insight into their legendary tones.

Eric Clapton and His Martin Acoustics

Eric Clapton frequently turned to his Martin 000-42 model, praising its comfortable cedar top and responsive performance. The hand-voiced bracing and Mahogany back/sides delivered clear treble tones to cut through mixes during legendary session work and early albums. The lighter build brought out Clapton’s emotive blues style.

Kurt Cobain’s Fender Mustang

Kurt Cobain relied on Fender Mustang guitars, including during Nirvana’s breakthrough “Smells Like Teen Spirit” hit. The brighter-sounding alder bodies and flat-pole pickups captured his overdriven crunch tones perfectly. While Mustangs traditionally used 17” scale lengths, Cobain preferred shortening his down to 24” for flexibility when dropping tunings and slamming strings. The customized instruments suited his inventive grunge-punk aesthetic.

Guitar Soundboard: Wrap Up

The guitar soundboard remains a vital component in shaping tone. Luthiers select different woods and build patterns to perfectly match voices to playing styles – whether aiming for spruce’s balanced responsiveness, cedar’s smooth warmth or exotic wood richness. Understanding construction principles helps find ideal fits. Proper maintenance keeps tops projecting over decades. With the right insight into acoustic design, passionate artists discover the perfect creative tools to inspire their musical visions.


What is the soundboard on a guitar?

The soundboard, also called the top, is the thin wooden plate on the front of the guitar body that vibrates to amplify and project the strings’ vibrations out through the soundhole as musical soundwaves.

What is the purpose of the sounding board on a guitar?

The purpose of the guitar’s soundboard or top is to amplify the vibration of the strings by acting as a resonant cavity. Its thinness, size, shape, bracing pattern underneath, and wood type allow it to sympathetically vibrate, projecting air vibration through the soundhole.

What thickness should a guitar soundboard be?

For optimal resonance, projection, and tone, a guitar soundboard should be 0.09 to 0.12 inches (2.5 to 3 mm) thick if made of spruce or cedar, the most common soundboard woods. Thinner tops boost treble but are delicate; thicker tops increase durability and boost bass.

What makes a guitar loud?

A guitar’s volume and projection depend on having a large, thinly-built soundboard that can freely vibrate to amplify the strings’ vibrations, coupled with a well-shaped body chamber and soundhole that directs soundwaves outward efficiently. The soundboard material crucially affects loudness.

By Nate Pallesen

Nate is just your average (above average) guitar player. He's no Joe Satriani, Jimi Hendrix or Jimmy Page - wait this site is about acoustic guitars (sorry) He's no Django Reinhardt, Chet Atkins, or Michael Hedges, wait? who!? He's no Robert Johnson, Eric Clapton or Ben Harper - more familiar? Anyway you get the point :-)

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