AUSTRALIA'S #1 ACOUSTIC GUITAR SPECIALIST
AUSTRALIA'S #1 ACOUSTIC GUITAR SPECIALIST
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)
Acoustic Centre offers free shipping on all new items to most locations within Australia on all orders over $99, excluding Western Australia, Northern Territory and Far North Queensland. Used items have a flat rate shipping fee of $59 within our usual shipping locations. We also offer competitive Express shipping options at checkout.
Customers located in Western Australia, Northern Territory and Far North Queensland recieve free shipping on all accessory orders over $99, but will incur a flat rate instrument or large item shipping charge of $179 (or $299 for Express shipping).
Used instruments fall outside of our usual shipping policy, and shipping to most addresses will be $69 - $99, as shown at checkout.
Occasionally due to issues with delivering to remote or unusual destinations, we aren't able to offer free postage. We reserve the right to retract the offer if freight costs exceed 15% of your purchase. We will always notify you if there is an issue and offer a full refund or arrange alternative delivery options.
All strings and accessories will be shipped with tracking via courier or Australia Post. Other items including guitars and amplification equipment will be shipped using our courier service providers, with a tracking number and signature on delivery.
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We offer 3 Months interest free on purchases under $1000, and 6 Months interest free on purchases over $1000.
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Studio19 Rentals operates Australia’s foremost in-store Rental program for musical instrument retailers, and allows you to have the gear of your dreams now for a low monthly price.
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We endeavour to show the actual instrument in stock whenever possible, but the guitar in stock may differ slightly from the one shown on our website. Materials used can look different from guitar to guitar, including timber grain and colour, parts colours and finishing. If an instrument is a one-of-a-kind or preowned guitar, the picture will always be of the actual guitar in stock, but production models may have slight variations to the picture shown.
If you're after a particular look, feel free to email us at info@acousticcentre.com.au or send us a message through our chat service to request photos of the actual guitar in stock. We are more than happy to send through pictures of all in-stock guitars, to make your choice easier.
Please note that returns will not be accepted for variations in timber grain / colouring, finish variations and parts colouring, unless there is a fault with the instrument. If you have any questions at all regarding an instrument's appearance, just drop us a line - we're always happy to send photos, and if we have more than one instrument in stock you'll be able to choose the exact guitar that you receive!
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I dont usually write down reviews, but this guitar is exceptional. I'm very happy with my purchase. I went in the store looking to get a feel for a Slope Shoulder dreadnought, and ended up taking this home. This may have laminate back and sides, but it's actually the least laminate sounding acoustic I've ever heard. fit and finish is great and actually have a more expensive feel than other brands. I did put this against three other guitars in the store and loved this better. I was ready to spend more, but walked out with more money in my pocket and that means I got more guitar for less money. I've already gig'ed mine and got a few compliments on my tone. They couldnt believe its an affordable copy of a more expensive model from a well-known brand.
These are amazing guitars for the price. The guitar has a solid wood top and it is fitted with a Fishman pickup. They are very well made and very nice to play. I am very pleased with my purchase. Thank you.
These are amazing guitars for the price. The guitar has a solid wood top and it is fitted with a Fishman pickup. They are very well made and very nice to play. I am very pleased with my purchase. Thank you.
Thanks Acoustic Centre, this is a nice quality guitar that plays and sounds extremely well and is also great value for the money. I have owned a Gibson J-45 in the past and foolishly sold it, but this is a nice enough replacement that I am very happy with. The purchase and delivery were without fuss and fast. Regards Jim
Great service quick delivery and a fantastic guitar very happy.
Great service quick delivery and a fantastic guitar very happy.
Amazing value guitar, plays and sounds as good as a gibson. Exceptional clarity of the notes, great for open chords but also great at finger picking stuff. Quality of construction is obvious and finish is exceptional. Would recommend testing out even if your looking at more expensive guitars.
Initially came into the store with the intention of buying a 'knockabout' guitar for under $1000 to use around the house. Was absolutely blown away by the quality of this guitar when I first played it - couldn't believe the quality v price ratio. I honestly don't know how Sigma do it, but this honestly gives the Gibson j45s a run for it's money. I've since had the action lowered slightly & installed a better quality pickup & now use it as my main gigging guitar, replacing my Maton jumbo!
What a beautiful guitar this is, I've always been a fan of the Gibson j45s but being a student they've always just been a dream until this came along! Played one in the store and could not believe the clarity in this thing. Sigma have absolutely nailed this one and it'd be down right rude not to be on your list of dream guitars.
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