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Why is it that different woods are used for acoustic guitars, and how do these woods affect the sound of the instrument?
In the past, there was less opportunity for confusion on this issue, since most guitars were made of mahogany, rosewood, maple, ebony, and spruce. But with the dwindling availability of traditional tonewoods, particularly those cut from old-growth forests, major manufacturers and smaller luthiers have been compelled to consider the use of alternative species of tonewoods. The type of wood used on a guitar is probably the single most influential factor to its tone.  There are a variety of different woods to choose from.  Below are many different wood descriptions and their general tonal properties.

Back and Sides

Besides serving to form the enclosure of the soundbox, the back and sides of the guitar also act as a sympathetic resonator whose oscillations contribute greatly to the harmonic mix. When judiciously selected (with due consideration given to design criteria and the other tonewoods used in the instrument), the back and sides can have a tremendous effect on the overall tone of the instrument.

Brazilian Rosewood
(Dalbergia Nigra) Brazil. Sometimes referred to as "Jacaranda", this species of genuine rosewood ranges in color from dark brown to violet with spidery black streaks.  The smell is like roses when freshly cut.   Brazilian rosewood is considered nearly extinct and is extremely expensive if available at all. Extremely resonant producing full, deep basses and brilliant trebles.

East Indian Rosewood
(Dalbergia Latifolia) India.  Typically richly grained with dark purple, red, and brown color, East Indian rosewood is resinous, stable and generally more consistent than most other rosewood species.  East Indian rosewood is extremely resonant producing a deep warm projective bass response that is especially accentuated on large bodies guitars.

(Swietenia Macrophylla) South Americe. Yellowish brown to reddish brown in color, Genuine or "Amazon" mahogany is exceptionally stable and consistently clear.  Mahogany is much lighter in weight than rosewood, koa, or maple.  In spite of its weight, mahogany yields a surprisingly strong loud sound with an emphasis on clear bright trebles.

Figured Mahogany
This beautiful and rare (often quilted) variety of genuine mahogany occurs in a very small percentage of mahogany trees. Though difficult to bend, figured mahogany shares the same tonal properties of the unfigured mahogany.

Flamed Maple
(Acer Campestre) Germany. Curly, flamed, tiger striped, or "Fiddleback" maple refers to the characteristic alternating hard and soft rippling which runs perpendicular to the grain in some rarer maple trees.  This particular species of European maple is very hard and reflective, producing a loud powerful projective sound.  Uniquely figured domestic "Birdseye" maple, used on the D-60 models, displays characteristics and tonal properties similar to European Flamed maple.

(Acacia Koa) Hawaii. Golden brown color with dark streaks and a lustrous sheen.  Koa wood occasionally develops a curly or flamed figure.   Regardless of any figuring, koa seems to have a bass response that is slightly less than that of rosewood and treble response that is slightly less than that of mahogany.   The result is a very equally balanced instrument.

(Juglans Regia)A great selection with bright woodiness of mahogany when played lightly, with much of the punchiness and power of rosewood when you dig in.   When properly braced, a walnut backed guitar can have a unique warmth and tonal depth.  This is a dark brown, highly figured specialty wood which is grown in a wide variety of locations.

(Machaerium Scleroxylon) Bolivia.  Also known as Bolivian or Santos "rosewood", morado ranges in color from a light violet brown to reddish brown with occasional olive and black streaks. Finer in texture than most rosewoods, morado is a close visual substitute for East Indian rosewood, and has very similar tonal properties.

The best way to describe Myrtlewood is that it has the powerful voice of rosewood coupled with all the clarity, brightness and balance of maple.   Myrtlewood can be found in the coastal mountain regions of northern California and southern Oregon.   With coloration anywhere from an elegant whitish/straight grained look (a blonde mahogany), to yellow/green with flame, the tonal personality of Myrtlewood is consistent.  Use of this wood on a guitar was first done by Breedlove and is featured on the Breedlove "Northwest" guitar.  Prior to this, using Myrtlewood to build a guitar has never been done.

Striped Ebony
Deeper and richer sounding than East Indian Rosewood, many would characterize striped ebony as very similar to Brazilian rosewood.   It is dense, has similar reflective properties to Brazilian, and it also has a high specific gravity.    It has a striking, distinctive vertical stripe pattern, variegated dark brown, black and green. It makes a truly exceptional twelve-string.  Striped ebony comes from New Guinea, is exclusively government controlled, and is not an endangered species.

With a density and reflectivity approaching that of maple, cherry produces a rich, projective midrange and balance without favoring the bass or treble frequencies.

White Ash
White ash was utilized on a limited but extremely popular run of D-16A Martin guitars made between 1987 and 1990. The tonal character of ash is surprisingly loud and bright, with a strong midrange and a crisp bass.

Top (Soundboard)

Each part of the guitar seems to play a role, be it significant or subtle, in determining the tonal characteristics of the instrument. In very general terms, the top, or soundboard, seems to affect the guitar's responsiveness, the quickness of its attack, its sustain, some of its overtone coloration, and the strength and quality of each note's fundamental tone. Most luthiers (but not all) believe that the wood chosen for the top is the single overriding variable that determines the quality of tone of a finished instrument.

Sitka Spruce
(Picea Sitchensis) Canadian Northwest & Alaska. Sitka spruce is the primary topwood for Martin Guitars.  It is chosen because of it's consistent quality as well as it's straight uniform grain, longevity, and tensile strength.  Tonally, Sitka spruce is extremely vibrant providing an ideal "diaphragm" for transmission of sound on any size and style of stringed instrument.

Bear Claw Sitka Spruce
A specifically named variety of Sitka Spruce.  A randomly figured Sitka, due to genetic or environmental factors.  It looks like a bear has clawed across the grain of the wood.  This particular variety is highly coveted for it's unique patterns.  From the Pacific Northwest.

Englemann Spruce
(Picea Engelmannii) United States.  Englemann spruce is prized for its similarity in color to European (German) White spruce as well as its extreme lightness in weight which seems to produce a slightly louder and more projective or "open" sound than Sitka spruce.  Englemann spruce grows in the alpine elevations of the American Rocky Mountains and the Pacific Cascades.  It is considerably more limited in supply than Sitka spruce.

Adirondack (Red) Spruce
This legendary wood that Martin used for its tops throughout its golden years came from the East Coast, from the Southern Mountains into New England and upper New York State.  Called both Appalachian and Adirondack spruce, it has a creamy white color.  Similar to Sitka, Adirondack responds well to either a light or firm touch.  It has more overall resonance than Sitka.  Interesting grain color variations make this another visually desirable top.  Adirondack has been unavailable since the mid-1940's.  Virgin growth has been (fortunately) preserved in National parks, the rest is all second growth, plentiful but too small to be usable for guitar tops until recently.  Guitar makers have started finding second growth of at least 100 years old that is big enough to be used for tops again.

German Spruce
The "ringiest" of all spruce species.  Extremely clear and bell like, with the versatility of Sitka.   Exceptional sound for light to very firm techniques.  Very white in color.

Western Red Cedar
(Thuja Plicata) United States, particularly the Pacific Northwest.  Western Red Cedar has long been utilized as a soundboard material by classical guitar makers for its vibrance and clarity of sound.   It is extremely light in weight compared to spruce and the tonal result is generally a slightly louder, more open response.  Balanced, warm and rich with bright trebles.  What is most characteristic of Red Cedar is that it sounds broken-in, even when new.  Exceptional sound for light to very firm techniques.  Coloration runs from light (almost as light as Sitka) to a very dark reddish-brown.

(Sequoia sempervirens), California, USA. A great choice for the fingerstylist with somewhat more richness in the bass than cedar.  Redwood responds to subtle playing with a crisp balanced sound. The bass response is particularly round and full with a
piano-like crispness.  Lacquer and glue do not bond quite as well as the spruces.  Because of this (as with Cedar), some Luthiers (Goodall) recommend light gauge strings only on guitars with these tops.   Originally from Northern California, many luthiers (i.e. Breedlove)  get redwood from recycled lumber and timber salvage.

Western Larch
(Larix Occidentalis) United States.  Western larch has clearly marked annual rings and a fine uniform texture.  Larch is harder and stronger than most conifers including spruce.  It bears a close visual resemblance to Sitka spruce and due to its increased stiffness, it is an appropriate choice for scalloped braced models yielding a projective and crisp response.

(Acacia Koa) Hawaii. Historically, koa tops have appeared primarily on small bodied 0 & 00 size Hawaiian guitars and ukuleles although recent koa Dreadnoughts and custom guitars have been popular.  Koa produces a predominately bright treble response with less volume than spruce, but the slight loss in volume is overshadowed by the extreme beauty of the grain. Koa tops are available on special order and custom instruments.

Genuine Mahogany
(Swietenia Macrophylla) Brazil. Mahogany was first introduced as a topwood in 1922 on the lesser expensive Style 17 guitars. Tonally, mahogany is less projective than spruce, producing a subdued response that is crisp and delicate with emphasis on the midrange.  Mahogany tops are usually available only custom instruments, but has recently become a standard top in the   Baby Taylor travel guitars.

(Juglans California) California, USA. Using a highly figured walnut for a top wood, matched with walnut back & sides, was a first of the Breedlove company but is now offered by Taylor guitars and others.   Rich and warm bass with plenty of crispness on the mid and treble side is typical of an all-walnut guitar.  Walnut offers a lot of value for your dollar; with the beauty and visual impact of an all Koa guitar, but at a much lower price.  Coloration is dark brown with a lot of figure and flame.

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