Double Top vs Traditional Top

Walk into any serious classical guitar shop today and you will hear two words that did not exist in the vocabulary a generation ago: double top. Concert players have adopted the design in large numbers, luthiers argue about it, and buyers shopping above a certain price point now face a real choice between a traditional solid top and a composite one. This article explains what each design is, how they differ in sound and feel, and which players tend to prefer each.

A traditional classical guitar top is a single plate of solid spruce or Western red cedar, usually two to three millimeters thick, with a system of wooden braces glued to its underside. The classic pattern is the fan bracing developed by Antonio de Torres in the nineteenth century, though many modern builders use variations such as lattice, radial, or hybrid patterns.

The top plate itself carries the load of the strings. The braces stiffen it enough to survive string tension while leaving it free to vibrate. A luthier controls the voice of the instrument by graduating the thickness of the plate, shaping and placing the braces, and tapping and flexing the wood until it responds the way he wants. Every top is slightly different because every piece of wood is slightly different, and that variability is part of the appeal.

A double top, also called a composite or sandwich top, replaces the single solid plate with two very thin skins of tonewood, each roughly half a millimeter to one millimeter thick, bonded to a lightweight core between them. The core is almost always Nomex, an aramid honeycomb material borrowed from the aerospace industry, though a few builders use balsa or other materials. The finished laminate is about as thick as a traditional top but weighs dramatically less, often thirty to forty percent less, and is stiff across the grain as well as along it because of the honeycomb.

Because the skins are so thin, the outer face can be cedar or spruce and the inner face can be a different wood entirely. Where the top meets the sides and under the bridge, the honeycomb is replaced with solid wood, since Nomex will not hold glue or bear point loads. Bracing is minimal. Most builders pair the design with an elevated fingerboard and a stiff, relatively shallow body so the light top does as much of the work as possible.

The German luthiers Matthias Dammann and Gernot Wagner developed the technique in the 1990s. It has since spread widely; Fritz Ober, Armin Hanika, and dozens of makers in Europe, the Americas, and Australia now build double tops alongside or instead of traditional instruments.

This is why the double top exists. A top with very little mass starts moving with very little energy, so a double-top guitar is louder, speaks faster, and fills a large hall more easily than most traditional instruments. Players who perform unamplified in big rooms, or who play with orchestras and ensembles, feel this difference immediately.

Double tops typically have longer sustain and a remarkably even response across all six strings and up the neck. Wolf notes and dead spots, the small inconsistencies every traditional guitar has somewhere, are rare. For many players that consistency is a relief. Others feel that a guitar with no weak notes also has fewer distinctive ones.

The two designs differ most audibly in their overtone behavior, and this is where most of the debate lives.

A solid wooden plate is stiff along the grain and flexible across it, with further irregularities added by the braces, the graduated thickness, and the natural variation in the wood. That unevenness gives the top many distinct resonances at irregularly spaced frequencies. When you pluck a note, those resonances reinforce some harmonics and damp others differently for every pitch, so each note carries its own overtone fingerprint. Wood also has significant internal damping, which rolls off the highest harmonics quickly. The result is the warmth and bloom players associate with a fine spruce or cedar top: a strong fundamental, rich lower harmonics, and upper harmonics that fade early. Notes have individual character, and the color changes dramatically as the right hand moves between the bridge and the fingerboard.

A double top behaves differently. The honeycomb core couples the two skins into a plate that is stiff in both directions, so its resonances are more regular and tend to sit higher. Its extremely low mass lets it radiate efficiently across a wide band of frequencies rather than favoring certain regions, and Nomex has very little internal damping. More of the upper harmonics make it out into the room, and they sustain longer relative to the fundamental.

Players hear this as brightness, clarity, and completeness. Every note has a full harmonic series, chords separate cleanly, fast passages do not blur, and the sound carries a shimmer that reads as presence in a hall. Critics hear the same qualities as uniformity: less difference between registers, less variation with right-hand placement, and a glassy or metallic edge, especially on new instruments or with carbon trebles. Some describe the sound as processed or sterile. Sympathetic resonance is also stronger, which adds reverberance on stage but can muddy intimate playing. And because the top transmits transients so efficiently, nail noise and attack are more exposed than on a traditional top, which tends to smooth them over.

The best builders work hard to counter the stereotype. They voice the inner skin, choose cedar for one or both faces, or add mass at the bridge to tame the upper harmonics and bring the balance closer to a traditional guitar. A top-tier double top can be considerably warmer than its reputation suggests. The sterile complaint usually comes from less refined examples.

Double tops do not compress as quickly when pushed, so fortissimo stays clear where a traditional top may start to choke. The flip side is that a guitar this responsive demands control. Pianissimo can take adjustment, and every imperfection in the nails or the attack is audible.

A traditional spruce top is expected to open up over years of playing; part of the pleasure of owning one is hearing it mature. A double top tends to sound fully developed almost immediately and changes less over time, which is either a virtue or a loss depending on your point of view. The composite is less sensitive to humidity and far less prone to cracking than a solid plate, a real advantage for touring players. If a double top is damaged, however, repair is harder, since the layers cannot be cleated or spliced the way solid wood can.

Building a sandwich top is labor-intensive and unforgiving. A failed glue joint or a poorly voiced skin can ruin days of work, and that risk is built into the price. Most double tops cost as much as or more than a comparable traditional instrument from the same luthier.

Double tops are often discussed alongside lattice-braced guitars, the design popularized by Greg Smallman in Australia. Lattice guitars pursue the same goal of a very light, stiff top, but they do it with an ultra-thin solid plate supported by a grid of slender braces, often carbon fiber reinforced, rather than a laminate. The two designs reach similar loudness with somewhat different attack and color. Lattice guitars are sometimes described as having a more percussive attack and a darker, rounder tone than double tops, though builders vary widely within both camps.

Between those extremes sit most serious amateurs and students, and here the honest answer is that it depends on where you play and what you value. A player who performs mostly at home, in studios, or in small recital spaces will rarely need the extra volume and may prefer the warmth and individuality of a fine traditional top. A player who performs in churches, large halls, or with other instruments will appreciate what a double top can do.