Eastman Guitar Lines: AC, AD, E, and SB Explained

How Eastman lines are organized

Eastman guitars use simple two-letter prefixes to tell you what kind of instrument you are looking at before you even read a spec sheet. The AC and AD prefixes belong to steel-string acoustic guitars, the E prefix marks classical and nylon-string models, and the SB prefix identifies solid-body electric guitars. Once you know what each prefix stands for, the rest of the model number usually describes body size, trim level, and sometimes the tonewoods used.

The system matters because Eastman covers a wide range of players, from fingerstyle guitarists to jazz and rock players. If you understand the series, you can narrow your search before comparing specific specs. For a full list of current models, the Best Eastman Guitars guide is a good starting point.

AC Series: Balanced acoustics for versatile playing

The AC series is Eastman's steel-string acoustic line that tends to favor smaller or midsize body shapes. "A" stands for acoustic, and "C" generally refers to a concert-style or classical-inspired body outline, though actual dimensions vary by model. In the broader acoustic world, concert and grand concert bodies are known for producing a balanced sound with clear trebles and a warm bass. That balance makes AC models a strong fit for fingerstyle, recording, and any setting where you want notes to sit evenly across the strings.

Because the body is often more compact than a full-size dreadnought, AC guitars can also be more comfortable to hold, especially for smaller-framed players or those who play seated for long sessions. Some AC models include a cutaway for upper-fret access, but many remain non-cutaway for a traditional look and slightly stronger resonance.

When it comes to tonewoods, Eastman uses a mix of solid spruce, cedar, mahogany, and rosewood across the AC line. The top is the biggest influence on volume and attack, while the back and sides shape resonance and sustain. A spruce top tends to be bright and responsive, while cedar offers warmth and a softer attack. If you are choosing between those two common tops, the Spruce vs Cedar Guitar Tops comparison is worth reading.

For players who want a versatile steel-string that can handle fingerstyle, light strumming, and even some flatpicking, the AC series is a natural first stop. The Best Acoustic Guitars guide includes several AC models alongside other brands, which can help you see how they compare on specs.

AD Series: Dreadnought-style power and projection

The AD series is Eastman's dreadnought-style acoustic line. The "D" stands for dreadnought, the largest common steel-string body shape. Dreadnoughts produce a loud, projective tone with strong bass, which is why they remain the default choice for flatpicking, bluegrass, and any setting where you need to cut through a mix without amplification. AD models bring that same fundamental character to the Eastman catalog.

A dreadnought body has wide lower and upper bouts and a deep waist, giving it more internal air volume than concert or parlor shapes. That volume translates to bigger bass and more overall projection. The tradeoff is that a full-size dreadnought can feel bulky for some players, especially those with shorter arms or a preference for smaller bodies. If you are not sure whether a dreadnought is right for you, the Dreadnought vs Jumbo Acoustic Guitars article covers how the shape compares to even larger options.

In the AD line, Eastman typically pairs solid spruce tops with mahogany or rosewood back and sides. Mahogany offers a clear, woody voice with a strong midrange and fewer complex overtones, while rosewood delivers deeper bass and rich overtones. That choice gives you two distinct voices: a more direct, recording-friendly AD with mahogany, and a richer, more ringy AD with rosewood.

If you primarily strum, play with a flatpick, or sing while playing, the AD series is the most direct route to the classic dreadnought sound Eastman offers. The Best 6-String Guitars in 2026 guide is a useful resource for comparing dreadnought-style six-strings across brands.

E Series: Classical and nylon-string instruments

The E series is Eastman's classical guitar line, covering instruments designed for nylon strings. These guitars feature a wider neck, a flat fingerboard, and a body that meets the neck at the 12th fret, following the traditional classical design. That construction produces a warm, rich sound that makes both chords and fingerpicking a pleasure to hear, with a soft attack and long, detailed sustain.

Because the neck is wider and the string spacing is greater, classical guitars feel different under the left hand than steel-string acoustics. That difference can take a few weeks to get used to if you are switching from a steel-string. If you are trying to decide between the two, the Classical vs Steel String Acoustic Guitars article explains the key differences in nut width, string tension, and playing technique.

Eastman's E series includes entry-level and higher-trim classical models. The top wood is a major factor in how each model sounds. Cedar is a common alternative to spruce on classical guitars because it offers warmth and compression, while spruce provides more brightness and projection. Both are valid options, and the choice depends on whether you want a more mellow or more articulate voice.

If you play classical repertoire, bossa nova, or fingerstyle music that benefits from the rounded tone of nylon strings, the E series is the line to explore. The Best Classical Guitars guide lists Eastman models alongside other classical options and compares them on specs like scale length, nut width, and body depth.

SB Series: Solid-body electric guitars

The SB series is Eastman's solid-body electric guitar line. "SB" stands for solid body, and it covers instruments built for rock, blues, jazz, and fusion. Eastman's electric guitars are known for using quality tonewoods, often a carved top or a single-cutaway shape similar to a classic double-horn or single-horn design. Because solid-body guitars have no hollow resonance chamber, they rely almost entirely on pickups and electronics to shape the amplified tone.

The body wood still matters. Denser woods produce a more focused sound with longer sustain, while lighter woods offer a softer, more open response. Eastman typically uses mahogany for the back and a maple or carved spruce top on many SB models, combining the warm midrange of mahogany with the bright articulation of a harder top wood.

Pickups are the next major decision. Eastman's SB guitars often come with humbuckers, which offer a thicker, noiseless output that is ideal for rock and jazz. Some models feature a coil-splitting option so you can get a single-coil-like tone when needed. The Single-Coil vs Humbucker Pickups article covers how these two pickup types differ in output and tone.

If you are an electric player looking for a well-built solid-body with attention to woods and craftsmanship, the SB series is worth a serious look. The Best Electric Guitars guide compares SB models side by side with Fender, Gibson, PRS, and other brands, which helps you see how they stack up on specs.

How to choose between the Eastman lines

The right Eastman line depends on the music you play and how you like to play it. Start with the instrument type: steel-string acoustic, nylon-string classical, or solid-body electric. Then consider body size and tonewood preference within that type. If you are an acoustic player who wants a guitar that is easy to hold and balanced across all strings, the AC series is the natural pick. If you want maximum projection and bass for flatpicking or singing, the AD series delivers. If you play classical or fingerstyle with nylon strings, the E series is the only Eastman line that gives you the correct nut width and string spacing. If you plug in to an amp and play rock, blues, or jazz, the SB series is your entry point.

Once you know which series fits your playing style, the next step is to compare specific models on specs like scale length, body depth, and nut width. The Guitar Scale Length vs Body Size article explains why those dimensions affect feel and tone. For a complete overview of the brand's current lineup, the Best Eastman Guitars guide is the best single resource.

What to pick for your use

Questions

What does AC stand for in Eastman guitars?

AC stands for acoustic concert, indicating a steel-string acoustic with a midsize or concert-style body. These guitars offer balanced tone and comfortable playability.

What does AD stand for in Eastman guitars?

AD stands for acoustic dreadnought, the classic large-body steel-string shape known for loud projection and strong bass response.

Is the Eastman E series suitable for steel-string players switching to classical?

Yes, but expect a transition period. The E series has a wider nut and greater string spacing, and nylon strings feel softer and have lower tension than steel strings.

Do Eastman SB electric guitars have single-coil or humbucker pickups?

Most SB models use humbuckers, though some offer coil-splitting for a single-coil-like tone. Check the specific model's specs for pickup configuration and wiring options.

Are Eastman guitars made with tonewoods that require CITES permits?

Some Eastman models may use rosewood, which is regulated under CITES. This mainly matters for international travel; check the rules before shipping a guitar across borders.

Which Eastman line is best for a beginner?

For a beginner, the AC series is a good starting point because the smaller body is easier to handle, and the balanced tone works well for learning to strum and fingerpick. The AD series is also fine if you prefer a full-size dreadnought.