Indledning
This manual provides essential information for the setup, operation, and maintenance of your SIGMA 36.5-inch Acoustic Electric Guitar, OM Junior, model SIG8OMJEVSB. Please read these instructions carefully to ensure proper use and longevity of your instrument.
The SIGMA OM Junior is a handcrafted acoustic-electric guitar featuring a spruce top with sapele/mahogany back and sides, a rosewood fingerboard, and D'Addario EXP16 phosphor bronze strings. It is designed to deliver a warm, rich tone with clear highs and balanced lows, suitable for both beginning and advanced players.

Image: Front, back, and headstock views of the SIGMA OM Junior Acoustic Electric Guitar. The guitar features a sunburst finish on the body, a black headstock with SIGMA logo, and chrome tuners. The back shows the natural wood grain of the sapele/mahogany.
Opsætning
- Udpakning og inspektion: Carefully remove the guitar from its packaging. Inspect the instrument for any signs of damage during transit.
- Indledende tuning: The guitar comes equipped with D'Addario EXP16 (Phosphor bronze) steel strings. Use a reliable tuner to bring the guitar to standard pitch. The guitar includes a built-in tuner for convenience.
- Battery Installation/Check: The acoustic-electric model requires a CR2032 battery for its onboard electronics (preamp and tuner). A battery is included. Ensure it is correctly installed in the battery compartment, typically located near the output jack or on the side of the guitar body.
- Tilslutning til en Ampafdækning (valgfrit): If using the electric capabilities, connect a standard 1/4-inch instrument cable from the guitar's output jack to your amplifier eller PA system.

Billede: Et nærbillede view of the SIGMA OM Junior Acoustic Electric Guitar's body, highlighting the teardrop sunburst finish. The warm, fading hues blend from black at the edges to a rich orange-brown in the center, showcasing the instrument's aesthetic design.
Betjening af guitaren
Afspilning af instrumentet
The SIGMA OM Junior's 36.5-inch total length and 23.4-inch scale length make it comfortable for various playing styles and body types. The satin finish neck provides a smooth playing experience.

Billede: En detaljeret view of the SIGMA OM Junior Acoustic Electric Guitar's neck, showcasing its satin finish. The smooth texture of the neck is designed for comfortable and fast playing.
Using the Onboard Electronics (KLT-18A Preamp)
Your acoustic-electric guitar is equipped with a KLT-18A preamp system, featuring a built-in tuner and 3-band equalizer (EQ) for tone control.
- Tuner: Press the "TUNER" button to activate the built-in chromatic tuner. The display will show the note being played. Tune each string until the indicator shows it is in tune. Press "TUNER" again to deactivate.
- Bind: Adjusts the overall output level of the guitar when ampliificeret.
- 3-Band EQ (Bass, Middle, Treble): These knobs allow you to shape the amplified tone of your guitar.
- Bas: Controls the low-frequency response. Turn clockwise for more warmth and depth, counter-clockwise to reduce muddiness.
- Mellem: Controls the mid-frequency response. Adjust to cut through a mix or reduce harshness.
- Diskant: Controls the high-frequency response. Turn clockwise for more brightness and clarity, counter-clockwise to soften the tone.
- Fase: The "PHASE" button can help reduce feedback when playing at high volumes or in certain acoustic environments. Experiment with this setting if feedback occurs.

Billede: Et nærbillede view of the KLT-18A preamp controls located on the side of the SIGMA OM Junior Acoustic Electric Guitar. The controls include knobs for Bass, Middle, Treble, and Volume, along with buttons for Tuner and Phase, enabling precise tone shaping.
Opretholdelse
- Rensning: Regularly wipe down the guitar with a soft, lint-free cloth. For the gloss finish body, a guitar-specific polish can be used sparingly. Clean the rosewood fingerboard with a suitable fretboard conditioner when changing strings.
- Udskiftning af strenge: Replace strings regularly to maintain optimal tone and playability. The guitar uses D'Addario EXP16 (Phosphor bronze) steel strings. When replacing, change one string at a time to maintain neck tension.
- Opbevaring: Store the guitar in a stable environment, away from extreme temperature changes and humidity fluctuations. A guitar case or gig bag is recommended for protection.
- Udskiftning af batteri: When the onboard electronics' battery indicator shows low power, or if the tuner/preamp stops functioning, replace the CR2032 battery. Open the battery compartment, remove the old battery, and insert a new one with the correct polarity.

Billede: Et nærbillede view of the D'Addario EXP16 strings on the SIGMA OM Junior Acoustic Electric Guitar. These phosphor bronze strings are known for their warm, rich tone and extended lifespan due to their coating.
Fejlfinding
| Problem | Mulig årsag | Løsning |
|---|---|---|
| No sound when plugged in | Dead battery, faulty cable, amplifier off, volume knob down. | Check/replace CR2032 battery. Ensure cable is functional and securely connected. Turn on amplifier. Increase guitar and amplifier volumen. |
| Summende strenge | Improper setup (action too low), worn frets, uneven fretboard, old strings. | Check string action. Replace old strings. If buzzing persists, professional setup may be required. |
| Tuner not working | Dead battery, tuner not activated. | Replace CR2032 battery. Ensure "TUNER" button is pressed. |
| Feedback when ampliificeret | High volume, proximity to amplifier, room acoustics. | Engage the "PHASE" button. Reduce volume. Move away from the amplivligere. |
Specifikationer
| Feature | Detalje |
|---|---|
| Modelnummer | SIG8OMJEVSB |
| Samlet længde | 36.5 tommer |
| Skala Længde | 23.4 tommer |
| Total Body Length | 17 tommer |
| Antal Frets | 20 |
| Top materiale | Gran Træ |
| Back & Side Material | Sapele Wood / Mahogany |
| Hals materiale | Sapele-træ |
| Gribebræt materiale | Palisander |
| Strenge | D'Addario EXP16 (Phosphor Bronze) Steel String |
| Tunere | Solid Chrome |
| Neck Radius | 320R (12.6 inches) |
| Slutte | Gloss (Body) |
| Elektronik | KLT-18A Preamp with Built-in Tuner and 3-Band EQ |
| Batteri | 1 CR2032 (inkluderet) |
| Varens vægt | 8.43 pund |
| Håndorientering | Højre |
Garanti og support
SIGMA offers a 30-Day Return Guarantee for this product. For any issues or inquiries, please contact SIGMA customer support. Details for contacting support can typically be found on the product packaging or the official SIGMA webwebsted.
Optional protection plans are available for extended coverage. Please refer to your purchase documentation for more information on these plans.





