Sigma Guitars: Martin's Heritage at an Accessible Price

Sigma Guitars: When Martin Creates an Accessible Legend

When talking about acoustic guitars, one name inevitably comes up: C.F. Martin. The Nazareth, Pennsylvania workshop has been synonymous with excellence since 1833. But did you know that Martin also gave birth to a more affordable brand, designed to compete with the wave of Japanese guitars flooding the market in the 1970s? That brand is Sigma Guitars.

Now relaunched by German distributor AMI Musical Instruments GmbH, Sigma offers acoustic guitars, classical guitars, electric guitars, mandolins, and even ukuleles that carry on the original philosophy: delivering Martin-quality design at an accessible price. With more than fifty models available on Green Musicians, Sigma has established itself as a go-to reference for guitarists seeking outstanding value for money.

The History of Sigma: From Martin to the German Revival

1970: Martin's Answer to the Japanese Invasion

In the early 1970s, the American guitar market was turned upside down by the massive arrival of Japanese instruments. Brands like Yamaha, Takamine, and Ibanez offered acoustic guitars of decent quality at prices far below those of Martin. For C.F. Martin & Company, action was urgently needed.

The solution? Create a separate brand that could compete with Asian imports without diluting Martin's prestige. And so Sigma Guitars was born in 1970. The first Sigmas were manufactured in Japan by various workshops, primarily Tokai Gakki and Kasuga Gakki, under Martin's technical supervision. The models were then shipped to Nazareth for inspection and final setup before distribution.

The Japanese Golden Age (1970-1983)

The first-generation Sigmas, produced in Japan, are now highly sought after by collectors. The most iconic models of this period are the DM-5 (mahogany) and DR-7 (rosewood) dreadnoughts, recognizable by their distinctive square, spatula-shaped headstock and the Sigma logo topped with the Greek symbol Σ.

In 1978, Sigma introduced the Second Generation featuring a Martin-style headstock, a gold decal logo, and most importantly, solid spruce tops on high-end models. The DM-18, DR-28, DR-35, DR-41, and DR-45 designations directly referenced the corresponding Martin models, an open marketing strategy. The peak of this era came with the D-10 Anniversary in 1980, produced to celebrate the brand's tenth anniversary.

The End of the Martin Era (1984-2007)

Production moved from Japan to Korea in 1984, then to Taiwan in 1994, and finally to Indonesia until 2007. Quality had its ups and downs during this period, but the Korean models from the late 1990s, particularly those with pearl inlays, are especially prized. In 2007, Martin decided to permanently discontinue the Sigma brand.

The German Renaissance (2011 - Today)

In 2011, the German company AMI Musical Instruments GmbH, based in Munich, acquired the worldwide rights to the Sigma brand from C.F. Martin. AMI immediately relaunched production with an ambitious range of 75 models, all designed in Germany and manufactured in China in carefully selected workshops. The philosophy remains the same: guitars inspired by Martin designs, featuring quality tonewoods and meticulous craftsmanship, at a price that remains accessible.

An interesting quirk: Sigma cannot use its name in the United States, as the trademark there had expired before being re-registered by St. Louis Music. Sigma guitars are therefore sold there under the name Kindred Guitars. A nod to the brand's family heritage.

Sigma's Technical Innovations

Sigma does more than just copy Martin designs: the brand has developed its own innovations over the decades. Here are the key technical advances that distinguish modern Sigmas:

Scalloped X-Bracing

Introduced on the SDR (Second Generation Rosewood Dreadnought) models as early as 1986, scalloped bracing is directly inspired by the Martin HD-28. This technique involves carving the brace wood to reduce mass while maintaining structural rigidity. The result: the soundboard vibrates more freely, producing a richer, more powerful, and more resonant tone. It is now a standard feature across the entire Sigma range.

Dovetail Neck Joint

True to Martin tradition, Sigma uses a dovetail joint to attach the neck to the body on all its models. This assembly method, more complex and more costly than modern tenon-and-mortise joints, provides optimal vibration transfer between the neck and body, ensuring superior sustain and sound projection.

Bone Nut and Saddle

On all models from the Standard series upwards, Sigma fits genuine bone nuts and saddles. This natural material, denser and more homogeneous than synthetic composites, transmits string vibrations with exceptional fidelity. It is a detail that makes all the difference in the timbre and harmonic richness of the instrument.

Dual Truss Rod

Modern Sigmas are equipped with a dual-action bidirectional truss rod, accessible through the soundhole on acoustic models. This system allows precise adjustment of neck relief in both directions, guaranteeing optimal playability regardless of climate conditions. A valuable asset for musicians who travel or play outdoors.

The Sigma Ranges on Green Musicians

Green Musicians offers a comprehensive catalog of Sigma instruments, covering all needs and budgets. Here is an overview of the main series available:

SE Series: An Entry-Level Range That Makes No Compromises

The SE (Special Edition) series is the gateway into the Sigma universe. Despite an accessible price point, these guitars feature a solid spruce top and laminated mahogany back and sides. Key models include the DM-1 dreadnought, the more compact 000M-1 in 000 format, and the DM12-1 for 12-string enthusiasts. An ideal range for starting out on a quality instrument.

Discover the Sigma SE Series

ST Series: Accessible Solid Tops

The ST (Solid Top) series steps up with a higher-quality solid spruce top, laminated mahogany back and sides, and refined finishes. The DMC-STE and GMC-STE models integrate a Fishman preamp for the stage. The OMM-ST in Orchestra Model format is particularly appreciated for its playing comfort and sonic versatility.

Discover the Sigma ST Series

15 Series: The Warmth of All-Mahogany

The 15 Series pays tribute to the legendary Martin D-15 with an all-mahogany construction (top, back, sides). The sound is warm, smooth, with rich mids and a natural compression that flatters fingerstyle playing. The 000M-15, DM-15, and 000M-15E Aged models with Fishman electronics are must-haves for lovers of woody tones.

Discover the Sigma 15 Series

Standard All Solid Series: All-Solid Excellence

The pinnacle of the Sigma range. These guitars are built entirely from solid tonewoods: AA-grade Sitka or Adirondack spruce top, solid mahogany or rosewood back and sides, ebony fingerboard and bridge. The SDM-18 (Mahogany Dreadnought), S000M-18S (000 12-fret), and SOMR-45 (OM Rosewood) models fearlessly compete with guitars costing two to three times as much.

Discover the Sigma All Solid Series

Crossroad Series: Built for the Stage

Designed for musicians who perform live, the Crossroad series combines quality construction (solid Sitka spruce top, laminated mahogany back and sides) with high-performance electronics from Fishman or LR Baggs. The SDM-10E, S000M-10E, and SGMC-10E models are built for live performance, with playing comfort and rock-solid reliability.

Discover the Sigma Crossroad Series

Limited and Special Editions

Sigma regularly produces limited editions that quickly become collector's items. Examples include the 000A White Pearl, the SGMC-41E-SB Sunburst, and the SDM-18E Limited equipped with an LR Baggs EAS-VTC pickup. These rare models, produced in small quantities, offer exceptional finishes and tonewoods.

Discover Sigma Limited Editions

Sigma Mandolins: The Bluegrass Tradition

Sigma does not limit itself to guitars. The brand also offers a range of A-style and F-style mandolins that carry on the great bluegrass tradition. The SMA-6 and SMA-8 models, built entirely from solid flamed maple with a hand-carved spruce top, are exceptional instruments praised by discerning mandolinists.

Discover Sigma Mandolins

Further Reading

If the Sigma universe fascinates you, these articles may also be of interest:

• Fender: The American Legend That Shaped the Sound of the Electric Guitar
• Cort: The Quiet Giant of Global Guitar Manufacturing
• Stagg: The Belgian Brand That Makes Music Accessible to All
• Used Guitar Buying Guide: How to Find the Hidden Gem
• Why Buy a Used Musical Instrument?

Why Choose Sigma on Green Musicians?

Choosing a Sigma guitar means betting on quality without compromising your budget. And choosing Green Musicians to purchase it means ensuring you get the best possible terms. Our marketplace connects passionate sellers from around the world, whether music stores or individuals, to offer you the widest selection of new and used Sigma instruments.

With a rich catalog of over fifty Sigma models, ranging from entry-level acoustic guitars to limited-edition collector's pieces, Green Musicians is the ideal destination to find the Sigma of your dreams. Every listing is verified, every seller is rated, and our team is available to advise you in your choice.

Whether you are looking for your first guitar, a reliable stage instrument, or a rare piece to complete your collection, the Sigma range offers you Martin-inherited build quality at an accessible price. And with Green Musicians, you are guaranteed to find the instrument you need, at the best price.

And there you have it! We hope this article has inspired you to discover or rediscover the world of Sigma and its exceptional guitars. All that's left is to browse Green Musicians to find the Sigma of your dreams at the best price.

We offer a complete catalog of musical instruments featuring brands from around the world such as Fender, Gibson, Martin, Taylor, Ibanez, and many more. Whether you are an amateur or professional musician, our marketplace is designed to bring you the very best in music.

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