Ulumac AG-04
Ulumac Aroma AG-04 Mini Guitar Amplifier User Manual
Model: AG-04
1. Introduction
The Ulumac Aroma AG-04 Mini Guitar Amplifier is a compact, portable, and versatile 5W amplifier designed for electric guitars. It features dual speakers, wireless connectivity, and switchable clean and overdrive effects, making it ideal for practice sessions, small performances, and on-the-go use. Its built-in rechargeable battery ensures extended playtime, and its intuitive controls allow for easy sound customization.

Figure 1: Ulumac Aroma AG-04 Mini Guitar Amplifier, showcasing its compact design and woven-texture grille.
2. What's in the Box
- Ulumac Aroma AG-04 Mini Guitar Amplifier
- USB Type-C Charging Cable
- User Manual (this document)
3. Setup
3.1 Charging the Battery
Before first use, fully charge the amplifier. Connect the supplied USB Type-C charging cable to the amplifier's USB 5V port and to a compatible USB power adapter (not included). The charging indicator light will show the charging status. A full charge provides up to 7 hours of playtime.

Figure 2: The amplifier features a built-in 2000mAh rechargeable lithium battery, offering up to 7 hours of continuous use.
3.2 Connecting Your Guitar
Plug your electric guitar's 6.35mm instrument cable into the "INPUT" jack on the side of the amplifier.

Figure 3: The amplifier supports both wired guitar connection via the input jack and wireless audio streaming.
3.3 Bluetooth Pairing
To connect a Bluetooth device (e.g., smartphone, tablet) for backing tracks:
- Ensure the amplifier is powered on.
- Activate Bluetooth on your device.
- Search for "AG-04" in your device's Bluetooth settings and select it to pair.
- The Bluetooth indicator light on the amplifier will illuminate steadily when connected.

Figure 4: Easily connect your smartphone or other devices via Bluetooth for wireless audio playback.
3.4 Headphone Connection
For silent practice, connect 3.5mm headphones to the headphone output jack on the top panel of the amplifier. This will mute the main speakers.

Figure 5: Utilize the earphone connection to practice without disturbing others, focusing on your music.
4. Operating Instructions
4.1 Power On/Off
Press and hold the "POWER" button on the top panel to turn the amplifier on or off.
4.2 Controls
The amplifier features three main control knobs and a channel switch:
- GAIN: Adjusts the input sensitivity and the amount of distortion, particularly noticeable in Overdrive mode.
- TONE: Controls the overall tonal character, from darker, warmer sounds to brighter, more cutting tones.
- VOLUME: Adjusts the overall output volume of the amplifier.
- OD./CLEAN Switch: Toggles between the clean channel for clear tones and the overdrive channel for distorted sounds.

Figure 6: Detailed view of the Gain, Tone, and Volume controls, allowing for precise sound shaping.
4.3 Using with Backing Tracks
In addition to Bluetooth, you can connect an external audio source (like an MP3 player or computer) via the AUX In port (3.5mm) for playing along with backing tracks.
5. Maintenance
- Cleaning: Wipe the amplifier with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Battery Care: To prolong battery life, avoid fully discharging the battery frequently. Recharge the amplifier regularly, even if not in use for extended periods.
- Storage: Store the amplifier in a cool, dry place away from direct sunlight and extreme temperatures.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound from amplifier. | Amplifier is off; Volume is too low; Guitar cable is loose or faulty; Headphones are connected. | Ensure power is on; Increase VOLUME knob; Check guitar cable connection; Disconnect headphones if not needed. |
| Sound is distorted or unclear. | GAIN or VOLUME knobs are set too high; Overdrive channel is active with high gain. | Reduce GAIN or VOLUME; Switch to CLEAN channel or lower GAIN in Overdrive mode. |
| Bluetooth connection issues. | Amplifier not in pairing mode; Device too far; Interference. | Ensure amplifier is on and Bluetooth is active; Move device closer; Reduce interference from other wireless devices. |
| Battery not charging. | Charging cable faulty; USB power adapter insufficient. | Try a different USB Type-C cable; Use a different USB power adapter (e.g., 5V/1A or higher). |
7. Specifications
- Output Wattage: 5 Watts
- Item Weight: 10.7 ounces
- Product Dimensions: 4.9"D x 2.6"W x 3.5"H
- Power Source: Battery Powered (Rechargeable Lithium Battery)
- Connectivity: 6.35mm Jack (Input), 3.5mm Jack (Headphone/AUX In), Wireless 5.3 (Bluetooth)
- Channels: Clean, Overdrive
- Controls: Gain, Tone, Volume
- Color: Brown
- Country of Origin: China
8. Warranty and Support
Ulumac products are designed for reliability and performance. This product comes with a standard manufacturer's warranty. For detailed warranty information, product support, or service inquiries, please refer to the contact information provided on the product packaging or visit the official Ulumac website. Please retain your proof of purchase for warranty claims.
24/7 quick-response. Hassle-free returns & exchanges within 365 days.
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