A Jumbo-size Refresh to Martin's Classic J-40 The J-40 represents the largest of Martin's time-tested Standard series instruments, and it's the go-to Martin for guitarists who crave the thunderous sound and subterranean bass response that only a jumbo-size guitar can deliver. Moreover, this refreshed Standard series J-40 turns back the clock to Martin's most cherished vintage era, elevating the J-40 with historic features from the company's prewar era and introducing a selection of performance-minded enhancements. Most notably, the refreshed J-40's solid spruce top now boasts Golden Era forward-shifted X-bracing to maximize its response and resonance. A set of rosewood back and sides then complements the top with complex overtones, shimmering highs, and enough booming low-end firepower to send nearby parlor guitars running. Plus, the select hardwood neck's GE Modified Low Oval profile and 1.75-inch nut width are geared to please high-speed flatpickers, fingerstyle pros, and couch strummers alike with its