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AUSTRALIA'S #1 ACOUSTIC GUITAR SPECIALIST
AUSTRALIA'S #1 ACOUSTIC GUITAR SPECIALIST
JM-SG45
Available at Acoustic Centre Melbourne
The Sigma JM-SG45 is a stunning slope shoulder dreadnought that captures the spirit of the iconic J-45 at a fraction of the price. With a solid Sitka spruce top and mahogany back and sides, this guitar delivers a warm, punchy tone with strong projection—perfect for singer-songwriters, strummers, and fingerstyle players alike. Its vintage sunburst finish and slope shoulder body make it a head-turner, both in sound and appearance.
Built for comfort and performance, the JM-SG45 features a low-profile mahogany neck, a Micarta fingerboard, and a 1-3/4" bone nut for easy fretting and smooth chord transitions. Onboard Fishman Sonitone electronics with discreet soundhole controls allow for clean, natural amplification when performing or recording. Finished with Grover nickel open-geared tuners and high-gloss polish, this guitar blends modern reliability with classic style.
Features
Slope shoulder dreadnought body delivers classic, full-bodied tone
Solid Sitka spruce top with mahogany back and sides for warmth and projection
Fishman Sonitone pickup system with Volume and Tone controls
Low-profile neck and 1-3/4" nut width for enhanced playability
Includes softshell case for protection and portability
Body Size: Slope Shoulder Dreadnought (D-14 Fret)
Construction: Dovetail Neck Joint
Top: Solid Sitka Spruce
Back & Sides: Mahogany
Neck: Mahogany, Low Profile
Nut & Saddle: Bone
Fingerboard: Micarta
Scale Length: 24.75” (628 mm)
Neck Width at Nut: 1-3/4” (44.5 mm)
Tuning Machines: Grover Nickel Open-Geared
Electronics: Fishman Sonitone (with soundhole controls)
Finish: High Gloss Vintage Sunburst
Case: Included (Softshell)
Instruments & Amps
Free courier shipping on orders over $1499 to eligible metro areas
$49–$69 standard shipping on lower-value orders
Express shipping available for an additional fee
Regional and remote areas may incur higher freight costs
Accessories
Free standard shipping on orders over $99
Flat $8.99 shipping under $99
$15 express shipping available
Delivery Details
All orders ship with tracking
Instruments and large items require signature on delivery
If freight costs exceed expectations, we’ll contact you before shipping
Shipping rates, eligibility, and delivery options are confirmed at checkout based on your location.
Buy Now, Pay Later
Zip – 3 months interest-free under $1,000, 6 months interest-free over $1,000
Afterpay – available at checkout
Pay in Full
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Studio19 Rentals – low monthly payments with the option to buy later
All prices are in AUD and include GST. Payment options are shown at checkout.
If something’s not right, please contact us first and we’ll help you work through the best solution
Returns, exchanges, repairs, or credits are available for faulty or misdescribed items
Return requests should be made within 7 days of delivery
Freight charges aren’t refundable
Non-faulty returns may incur return shipping and a small restocking fee
Opened consumables (including strings and picks) can’t be returned
Returns are assessed case-by-case so we can ensure the fairest outcome for everyone.
We aim to show the exact guitar in stock whenever possible
For one-of-a-kind or preowned instruments, photos will always be of the actual guitar you’ll receive
Production models may vary slightly in timber grain, colour, finish, or hardware due to natural materials
If you’d like to see the exact guitar before buying, just ask — we’re happy to send photos of the instrument in stock
Where multiple guitars are available, you can choose the exact one you receive
Please note: natural cosmetic variations aren’t considered faults, but if you have any questions about appearance, we’re always happy to help before purchase.
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