Martin OM-28 vs Martin OMJM | Guitar Gallery South Africa

In today’s video we dive into the differences between two outstanding Martin Orchestra Model guitars: the 2025 Martin OM‑28 and the 2021 **Martin OMJM (John Mayer Signature). Both instruments were fitted with fresh D’Addario XS 12-gauge strings just one hour before recording to give you a fair and level comparison.

🔍 Wood & build specs

OM-28 (2025)
• Top: Solid spruce (Sitka) 
• Back & sides: Solid East Indian rosewood 
• Scale length: 25.4″ — giving slightly higher tension, more projection and clarity. 
• Body: Orchestra Model (OM) size / 14-fret. 

OMJM (2021)
• Top: Solid Engelmann spruce with antique toner finish 
• Back & sides: Solid East Indian rosewood 
• Scale length: 25.4″ — same as OM-28 for full scale feel and response. 
• Body: OM / 14-fret, low-profile neck, upgraded features typical of John Mayer signature model. 

📍 About Guitar Gallery South Africa

Based in Johannesburg, Guitar Gallery is proud to offer some of the finest acoustic and electric guitars in the country. From boutique brands to legendary standards, our mission is to help musicians find the instrument that speaks to them in both tone and feel.

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