SIGMA GUITARS Jmsg45
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- This item is covered for 3 years
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Manufacturer Information
Sigma
https://www.sigma-guitars.com
hankins@sigma-guitars.com
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A Modern Slope Shoulder, Between Traditional Dreadnought and Smooth Playability
With its "Dreadnought Slope Shoulder" profile, the JM-SG45 fits within the spirit of bold acoustic guitars while remaining comfortable to hold. The combination of solid spruce and mahogany aims for versatile balance: enough body to accompany, and sufficient precision to highlight attacks and rhythmic placement.
For Whom and Which Styles?
The JM-SG45 is well suited for serious beginners to intermediate guitarists seeking an expressive acoustic, as well as for stage musicians looking for a simple and effective electro-acoustic. Its dreadnought format makes it particularly comfortable in folk, pop, country, acoustic rock, and pick accompaniment, while remaining responsive to fingerpicking.
Sound
The solid Sitka spruce top provides clarity, good volume reserve, and a response that opens up over time. The mahogany back and sides promote a direct sound with present mids and a warm grain, ideal for rhythms that "carry" in a mix. The bone nuts help transmit vibrations with greater precision and contribute to a clear sustain. Finally, the slope shoulder format slightly softens the attack compared to a more angular dreadnought, resulting in a tone that is often rounder and more singing.
Technical specifications
| Model | JM-SG45 |
| Format | Dreadnought Slope Shoulder |
| Top | solid Sitka spruce |
| Back and sides | mahogany |
| Finish | glossy sunburst |
| Neck | mahogany |
| Fingerboard | micarta |
| Scale length | 24.75" / 628 mm |
| Nut width | 44.5 mm / 1.75" |
| Nuts | bone |
| Tuners | Grover open nickel-plated |
| Preamp | Fishman Sonitone |
| Case | soft case SSC-D included |
Questions frequently asked
Is the SIGMA GUITARS JM-SG45 suitable for folk and pick playing?
Its Dreadnought Slope Shoulder body shape and solid Sitka spruce top promote volume and attack precision. The mahogany construction highlights present mids, useful for folk, pop, country, and acoustic rock rhythms.
What sound does the combination of solid spruce and mahogany produce?
The solid Sitka spruce top provides clarity and volume reserve. The mahogany back and sides deliver a direct, warm midrange tone. The bone nuts contribute to precise vibration transmission and clear sustain.
Can it be plugged into an amp or PA system?
A Fishman Sonitone preamp is integrated, making this model suitable for electro-acoustic use on stage.
What is the nut width of the neck?
The nut width is 44.5 mm, or 1.75 inches. The scale length measures 628 mm, or 24.75 inches.
Is a case provided with this guitar?
A soft SSC-D gig bag is included. The gear consists of nickel-plated open Grover tuners, complemented by a glossy sunburst finish.



