Martin Guitar J40

Steel-String Guitar

2025 Model
Type: Jumbo
Top: Solid spruce
Back and sides: Solid rosewood
Neck: Mahogany
Headstock: Rosewood
Fingerboard: Ebony
Abalone reduced hexagon fingerboard inalys
Abalone with multi-stripe rosette
Scale: 645 mm (25.4")
Nut Width: 44.5 mm (1.75" )
Bone nut
20 frets
Pickguard: Tortoise
Ebony bridge with compensated bone saddle
Open gold-plated machine heads
Strings: MA550T Authentic Treated Medium (Art. 473904)
Colour: Natural high-gloss
Includes ply hardhsell case
Made in USA

30-Day Money-Back Guarantee

3-Year Thomann Warranty

Available since March 2025
Item number 606109
Sales Unit 1 piece(s)
Top Solid Spruce
Back and Sides Rosewood, Solid
Cutaway No
Fretboard Ebony
Nut width in mm 44,50 mm
Frets 20
Pickup(s) No
Colour Natural, High Gloss
Case Yes
Incl. Gigbag No
Model Jumbo
Including Case Yes

5.799 €

All prices incl. VAT

Sales Rank

in Jumbo Acoustic Guitars

Tight-waisted jumbo, updated for 2025

The Martin J-40 is a full-size jumbo acoustic guitar with a distinctively tight-waisted body shape – wider in the lower bout than a dreadnought or OM, but with a more pronounced waist that reduces the physical bulk a standard jumbo imposes on the playing position. Introduced in 1985, it combines Martin's Standard Series construction with the projection and low-end weight a jumbo body produces. The 2025 model carries a solid Sitka spruce top in Aging Toner gloss finish, solid East Indian rosewood back and sides, a mahogany neck, and a bound ebony fingerboard with rolled edges. Gold open-gear tuners with butterbean knobs, abalone bridge pins, and reduced hexagon abalone fingerboard inlays mark it as the most visually ornate instrument in the Standard Series, and a hardshell case is included to keep the guitar safe. The J-40 is a purely acoustic instrument – no pickup system is fitted.

Forward-shifted bracing for a jumbo low end

The 2025 J-40 uses forward-shifted, GE-scalloped X-bracing, a system that moves the brace intersection toward the soundhole, freeing the larger lower bout to vibrate more freely and reinforcing the bass response the jumbo body naturally produces. The scalloping removes mass from the brace ends, consistent with pre-war Martin construction, and allows the top to move more openly across its full surface. The East Indian rosewood back and sides contribute a tonality that suits the format well, the low-mid warmth and focused clarity of rosewood balancing rather than compounding the jumbo's inherent bass weight. The compensated bone saddle on a 16" radius, bone nut, and ebony GE Modern Belly bridge are carried over from the broader 2025 Standard Series update. Martin Authentic Acoustic Lifespan 2.0 Phosphor Bronze Medium strings (.013-.056) are fitted as standard – a heavier gauge than the OM-28E's light set but appropriate for the larger body and longer 25.4" scale.

Home base for solo performers

The J-40 is aimed at solo performers and singer-songwriters who need an instrument that fills a room unplugged. Its projection and low-end response help it hold its own in acoustic sessions and small venues without amplification. The tight waist makes the instrument considerably more manageable than a broader-shouldered jumbo; players moving up from a dreadnought will thus find the body size adjustment less dramatic than expected. The honest consideration is the same one that applies to any jumbo: The larger lower bout adds low-end weight that suits strumming and open-chord work but can obscure fine detail in complex fingerstyle arrangements. Relative to the OM-28E, the J-40 trades the OM's balance and fingerpicking clarity for greater projection and bass presence – a different instrument for a different playing context, both built to the same manufacturing standard.

About Martin Guitar

Martin Guitar was founded in 1833 and is thus one of the most long-established brands in the history of the acoustic guitar. Several of Martin’s developments – including the dreadnought shape, robust X-bracing, the placement of the neck-to-body transition at the 14th fret (as opposed to the 12th fret as found on classical guitars), and the use of steel strings – have now become staples of modern guitar construction that countless other manufacturers have since adopted. To put it another way: Music today would sound very different had it not been for C.F. Martin & Co.

Sessions, stages, and dropped tunings

The J-40's projection and low-end response make it particularly well suited to contexts where volume and presence matter without amplification: Open mic nights, acoustic sessions with other instruments, and live settings where a PA is unavailable or undesirable. The larger body handles dropped and open tunings with composure, with the forward-shifted bracing keeping the bass response defined rather than loose under the additional string mass. In the studio, the rosewood and spruce combination records with a natural fullness that typically requires less low-end reinforcement than a mahogany-backed instrument. The abalone rosette, multi-stripe binding, and block inlay Golden Era headstock logo make the J-40 one of the most visually distinctive instruments in the Standard Series – an instrument that looks the part as well as sounds it.

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