Sigma Acoustic Guitar article
Sigma Acoustic Guitar Explained: Features, Types and Tips
A Sigma acoustic guitar offers solid-top construction at prices most competitors match only with laminates — the result of a long-standing commitment to accessible quality.
The Sigma Story
Sigma guitars were originally created by C.F. Martin & Co. in 1970 as an affordable alternative to Martin's American-made instruments, with production based initially in Japan and later in Taiwan and Korea. The aim was to offer Martin's blueprint and quality standards at prices accessible to students and intermediate players. Martin sold the Sigma brand in 1994, and the instruments disappeared for over a decade.
The brand was revived around 2011 under new management, with production shifted to China and quality oversight coordinated through European distribution. The current Sigma acoustic guitar lineup maintains the same commitment to accessible pricing with solid wood construction that defines the brand's appeal — particularly the use of solid spruce or cedar tops on models that would use laminate at equivalent prices from many competitors.
Body Shapes and Models
Sigma produces guitars across the standard acoustic body shapes: the dreadnought (DM and similar designations), the orchestra model or OM, the 000 (auditorium), and the folk or parlour. Each shape produces a different tonal character and suits different playing styles. The dreadnought is the largest and loudest, suited to strumming, folk and country. The OM and 000 shapes are smaller-waisted and produce a more balanced, midrange-forward sound better suited to fingerpicking and solo playing. Parlour bodies are smaller still and produce a drier, more vintage character.
Model naming in the Sigma range typically uses letter codes indicating the shape and construction. "DM" indicates a dreadnought with a mahogany back and sides; "DME" adds electronics; "SE" often denotes a solid top with mahogany. The full model designation tells you the shape, materials and additional features in a compact code once you know what each letter represents.
Tonewoods and Construction
The most significant buying decision in the Sigma range is whether to choose a solid or laminate top. A solid spruce or solid cedar top vibrates as a single piece of wood and improves with age as the fibres settle and the instrument opens up. A laminate top does not improve significantly with age and is acoustically less responsive, though it is more resistant to humidity changes — an advantage for players in variable climates or those who will not maintain a consistent humidity environment.
Sigma's mid-range models offer solid tops with laminate back and sides — the most cost-effective configuration, since the top contributes the majority of the acoustic character. All-solid construction appears at the upper end of the range and produces the most complex, resonant sound. Back and side woods in the Sigma catalogue include mahogany (warm, focused), rosewood (broad, complex), and ovangkol (a rosewood alternative with similar tonal characteristics).
Electronics
Several Sigma models include onboard electronics — typically a Fishman or proprietary pickup and preamp system with a side-mounted battery compartment and basic EQ controls. The "E" in a model designation usually indicates electronics are included. For players who need to plug in at open mic nights or rehearsals, a built-in system avoids the need for a separate soundhole pickup or external transducer. The Fishman systems in Sigma's mid-range are well-regarded as reliable, natural-sounding stage options.
Setup and Playability
Sigma guitars at the mid-price level typically arrive with adequate factory setups, though the nut and saddle can often be improved with a professional set-up. Action — the height of the strings above the frets — directly affects how comfortable the guitar is to play, particularly for beginners. If a new instrument feels uncomfortable or buzzes excessively, a set-up at a guitar shop is a worthwhile early investment. The combination of solid top construction and a good set-up makes a Sigma acoustic guitar punch considerably above its price point.
Price Range
Current Sigma acoustic guitar pricing in the UK runs from approximately £200 for laminate-top entry models to £500–£600 for all-solid dreadnought or orchestral models. The solid-top laminate back and sides range sits around £250–£400, which represents strong value against comparable instruments from other makers. Used examples are widely available and hold their value reasonably given their original price point.
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