1. Introduction
This manual provides comprehensive instructions for the safe and effective use of your GLARRY 20W Electric Bass Combo Amplifier, Model SC0393. Please read this manual thoroughly before operating the amplifier to ensure proper function and to prevent damage. This amplifier is designed for practicing electric bass guitar, offering adjustable tone controls and convenient input/output options.

Figure 1: GLARRY 20W Electric Bass Combo Amplifier in a practice setting.
2. Safety Instructions
To reduce the risk of electric shock, fire, or injury, always follow these basic safety precautions:
- Do not expose this appliance to rain or moisture.
- Do not use this apparatus near water.
- Clean only with a dry cloth.
- Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.
- Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
- Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
- Only use attachments/accessories specified by the manufacturer.
- Unplug this apparatus during lightning storms or when unused for long periods of time.
- Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
3. Package Contents
Verify that all items listed below are included in your package:
- 1 x GLARRY Electric Bass Amplifier (Model SC0393)
- 1 x Power Cord
- User Manual (this document)
4. Product Overview
4.1 Amplifier Features
The GLARRY 20W Electric Bass Combo Amplifier is designed for practice and offers the following key features:
- 20-watt output power.
- Integrated controls for Volume, Treble, Middle, and Bass.
- 1/4 inch input jack for bass guitar.
- 1/4 inch headphone output jack for silent practice.
- 1/8 inch auxiliary input jack for MP3 players or other audio sources.
- Durable construction with plastic protection and rubber foot pads.
4.2 Control Panel Layout
Familiarize yourself with the control panel of your amplifier:

Figure 2: Front Panel Controls of the GLARRY Bass Amplifier.
- MP3 Input (1/8 inch): Connect an external audio device like an MP3 player or smartphone.
- Input (1/4 inch): Connect your electric bass guitar here.
- Volume Control: Adjusts the overall output volume of the amplifier.
- Treble Control: Adjusts the high-frequency tone. Turn clockwise for brighter sound, counter-clockwise for mellower sound.
- Mid Control: Adjusts the mid-range frequency tone.
- Bass Control: Adjusts the low-frequency tone. Turn clockwise for deeper bass, counter-clockwise for lighter bass.
- Phones (1/4 inch): Headphone output for silent practice. Connecting headphones will mute the main speaker.
- Power Switch: Turns the amplifier ON or OFF.
5. Setup
Follow these steps to set up your amplifier:
- Placement: Place the amplifier on a stable, flat surface. Ensure adequate ventilation around the unit.
- Power Connection: Connect the provided power cord to the amplifier's power input and then to a standard electrical outlet. Ensure the power switch is in the OFF position before connecting.
- Instrument Connection: Connect your electric bass guitar to the Input (1/4 inch) jack using a standard instrument cable.
- External Audio (Optional): If you wish to play along with music, connect your MP3 player or smartphone to the MP3 Input (1/8 inch) jack using an appropriate audio cable.
- Headphones (Optional): For silent practice, connect your headphones to the Phones (1/4 inch) jack. This will automatically mute the amplifier's speaker.
6. Operating Instructions
Once set up, follow these steps to operate your amplifier:
- Power On: Ensure all volume controls are set to a low level. Flip the Power Switch to the ON position. The power indicator light will illuminate.
- Adjust Volume: Slowly turn the Volume Control clockwise to increase the amplifier's output volume to your desired level.
- Adjust Tone: Use the Treble, Mid, and Bass controls to shape your sound. Experiment with different settings to find your preferred tone.
- Treble: Controls high frequencies for brightness.
- Mid: Controls mid-range frequencies for presence.
- Bass: Controls low frequencies for depth.
- Using MP3 Input: If an external audio device is connected to the MP3 Input, its volume will be controlled by the external device itself. The amplifier's volume control affects both the bass guitar and the MP3 input simultaneously.
- Using Headphones: When headphones are plugged into the Phones jack, the main speaker will be muted, allowing for private practice. Adjust the volume using the amplifier's Volume Control and your headphone's volume if available.
- Power Off: Before turning off the amplifier, reduce the Volume Control to its minimum setting. Then, flip the Power Switch to the OFF position.
7. Maintenance
Proper care will ensure the longevity of your amplifier:
- Cleaning: Use a soft, dry cloth to clean the exterior of the amplifier. Do not use liquid cleaners or abrasive materials.
- Storage: When not in use, store the amplifier in a cool, dry place, away from direct sunlight and extreme temperatures.
- Transportation: The amplifier is portable. When transporting, ensure it is securely packed to prevent physical damage. The rubber edges provide protection against minor impacts.
- Ventilation: Ensure the ventilation openings are clear of dust and debris to prevent overheating.
8. Troubleshooting
If you encounter issues, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound from speaker. |
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| Distorted sound. |
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| No sound from MP3 input. |
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9. Specifications
Technical specifications for the GLARRY 20W Electric Bass Combo Amplifier:

Figure 3: Dimensions and Weight of the GLARRY Bass Amplifier.
| Feature | Detail |
|---|---|
| Brand | GLARRY |
| Model Name | Electric Bass Sound |
| Model Number | SC0393 |
| Output Wattage | 20 Watts |
| Speaker Size | 6.5 inches |
| Impedance | 8Ω |
| Input Jack | 1/4 inch |
| Auxiliary Input Jack (MP3) | 1/8 inch |
| Headphone Output Jack | 1/4 inch |
| Dimensions (L x W x H) | 11.42" x 4.45" x 10.63" (29 x 11.3 x 27 cm) |
| Net Weight | 6.61 lb (3 kg) |
| Power Source | Corded Electric |
| Enclosure Material | Wood-Based Panel |
10. Warranty and Support
10.1 Warranty Information
This GLARRY amplifier comes with a 6-month warranty from the date of purchase. This warranty covers manufacturing defects and malfunctions under normal use. It does not cover damage caused by misuse, accidents, unauthorized modifications, or normal wear and tear.
Please retain your proof of purchase for warranty claims.
10.2 Customer Support
For technical assistance, warranty claims, or any questions regarding your GLARRY amplifier, please contact GLARRY customer support through the retailer where the product was purchased or visit the official GLARRY website for contact information.