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Sigma SDM-18 Acoustic Guitar

Experience the classic warmth and timeless beauty of the Sigma SDM-18 Acoustic Guitar, meticulously crafted to deliver exceptional sound and playability. Designed with a D-14 fret body size and a dovetail neck joint, this guitar embodies traditional craftsmanship and modern engineering for a truly outstanding performance.

At the heart of the SDM-18 is a solid Sitka spruce top (AA grade), renowned for its rich resonance and dynamic range. Paired with solid mahogany back and sides (AA grade), this guitar produces a balanced tonal profile with pronounced lows and clear highs, perfect for a wide range of playing styles.

Crafted for comfort and precision, the mahogany neck features a low profile design, offering effortless playability across the entire fretboard. The bone nut and saddle enhance sustain and resonance, while the ebony fingerboard and bridge provide a smooth feel and excellent response.

Equipped with Grover nickel open-gear tuning machines with butterbean knobs, the SDM-18 ensures reliable tuning stability and precise adjustments. Finished in a high gloss coating, this guitar boasts a stunning aesthetic that reflects its exceptional quality and craftsmanship.

Complete with D'Addario EXP16 strings and a softshell case (SSC-D included), the Sigma SDM-18 is ready to accompany you on your musical journey, whether you're performing on stage or honing your skills in the studio. With its superior sound, comfortable playability, and elegant design, this guitar is sure to inspire creativity and elevate your performance to new heights.

Body Size: D-14 Fret
Construction: Dovetail Neck Joint
Top: Solid Sitka Spruce (AA Grade)
Back & Sides: Solid Mahogany (AA Grade)
Neck: Mahogany, Low Profile
Nut & Saddle: Bone
Fingerboard & Bridge: Ebony
Scale Length: 25.4” (645 mm)
Neck width at nut: 1-3/4” (44,5 mm)
Truss Rod: Two way Truss Rod
Tuning Machines: Grover Nickel Open-Gear w/ Butterbean Knobs
Finish: High Gloss
Strings: D´Addario EXP16
Softshell Case: SSC-D included

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).

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.

The Acoustic Centre ships goods Australia-wide, however at this time we are unable to accept international orders.

Zip Money - Buy Now, Pay Later.

We offer 3 Months interest free on purchases under $1000, and 6 Months interest free on purchases over $1000.

Click here for more information and Application form - it only takes a minute!

Studio 19 RentalsWe rent the things people love.

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. 

Studio19 offers:

  •  Low monthly payments
  •  Apply to buy at any time
  •  Protection plan available
  •  Return anytime after the minimum rental period
  •  No ongoing account keeping fees or charges

Click here  for more details.

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 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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