The Martin O’ahu® HG-28K2 brings an all-koa voice to the Martin O’ahu family, expanding on the HG-28’s unique sloped-shoulder body with a look and sound rooted in Hawaiian music history. Inspired by the Hawaiian music craze of the 1920s and early ’30s—a pivotal era that helped shape the modern steel-string acoustic guitar—this gloss-finished model delivers warm, expressive tone in a comfortable, approachable size. Its HG body is best described as a smaller sloped-shoulder Dreadnought with the depth of a 000, offering bold, balanced sound without the full-size feel. With koa as the top wood, it adds strong midrange projection, natural compression, and rich overtones that match its striking look—honoring the past while inviting a new generation to make history of their own.
Body Size: HG 14-Fret
Construction: Dovetail Neck Joint
Top Material: Koa
Top Finish: Gloss
Top Color: Natural
Back Material: Koa
Side Material: Koa
Back and Sides Finish: Gloss
Back and Sides Color: Natural
Top Inlay Material: Bold Herringbone
Binding: Antique White
Back Purfling/Strip: None
Back Inlay Material: Multi-Stripe
Side Inlay Material: None
Endpiece: Antique White
Endpiece Inlay: Multi-Stripe
Rosette: Style 28 Multi-Stripe
Pickguard: Faux Tortoise
Bracing Pattern: X Brace
Brace Shape: Scalloped
Brace Material: Spruce
Brace Size: 1/4"
Neck Material: Select Hardwood
Neck Shape: Golden Era (GE) Modified Low Oval
Neck Taper: High Performance Taper
Neck Finish: Satin
Neck Color: Natural
Neck Joins Body At: 14th Fret
Heelcap: Antique White
Fingerboard Material: Ebony
Fingerboard Width at Nut: 1 3/4"
Fingerboard Width at 12th Fret: 2 1/8"
Fingerboard Inlay Style: Old Style 18
Fingerboard Inlay Material: Abalone
Fingerboard Binding: None
Side Dots: Vintage White
Number of Frets: 20
Scale Length: 24.9"
Headstock Shape: Solid with Square Taper and Diamond
Headplate Material: Ebony
Headstock Logo: Martin O'ahu Script Overlay
Headplate Binding: None
Bridge Material: Ebony
Bridge Style: Modern Straightline
Bridge String Spacing: 2 5/32"
Bridge Pin Material: White Plastic
Bridge Pin Dots: Black Plastic
Saddle Material: Compensated Bone
Saddle Radius: 16"
Nut Material: Bone
Tuning Machines: Nickel Open Gear
Tuner Knobs: Butterbean
Electronics: None
Recommended Strings: Martin Authentic Acoustic Lifespan 2.0 Phosphor Bronze Light
Case: Hardshell
Label: Paper Label with Pre-Printed CFM IV Signature, Numbered in Sequence with No Total
Pleked: Yes
Left-Handed Availability: Yes