1. Introduction
Thank you for purchasing the Blackstar Fly 3 Bass mini amplifier. This compact and portable 3-watt amplifier is designed to provide a full bass tone for practice, home recording, and on-the-go use. Its innovative design and features ensure a rich sound experience despite its small size.

Figure 1.1: Front view of the Blackstar Fly 3 Bass Mini Amplifier.
Key Features:
- 3-Watt Output: Provides sufficient volume for personal practice.
- Emulated Line Output: Ideal for silent practice with headphones or direct recording.
- MP3/Line Input: Connect external audio devices for jamming along.
- Sub Control: Enhances low-frequency response for a fuller bass sound.
- Compact and Portable: Battery-powered for use anywhere.
2. Setup
Powering the Amplifier
The Blackstar Fly 3 Bass amplifier can be powered by batteries or an optional power supply (sold separately).
- Battery Installation: Locate the battery compartment on the underside of the amplifier. Insert 6x AA batteries, ensuring correct polarity.
- Power Supply (Optional): If using a power supply, connect it to the DC input jack on the rear of the amplifier. Use only a compatible Blackstar power supply to avoid damage.
Initial Connection
- Ensure the amplifier's power switch is in the 'OFF' position.
- Connect your bass guitar to the INPUT jack using a standard 1/4-inch instrument cable.
- If desired, connect an MP3 player or other audio source to the MP3 / LINE IN jack using a 3.5mm stereo cable.
- If using headphones for silent practice, connect them to the EM. OUT & PHONES jack.
- Turn the VOLUME knob to its minimum setting before powering on.
3. Controls and Functions

Figure 3.1: Top panel controls of the Blackstar Fly 3 Bass Mini Amplifier.
- INPUT: 1/4-inch jack for connecting your bass guitar.
- GAIN: Controls the input level and the amount of overdrive. Turning this up will increase distortion. The 'OD' button activates the overdrive circuit.
- EQ (DEPTH): Adjusts the overall tonal character of your bass sound. Experiment with this control to find your preferred sound.
- COMP (RATIO): Controls the compression level. Compression helps to even out the dynamics of your playing. The 'SUB' button activates the Sub control.
- SUB Control: When activated via the 'SUB' button, this control adds a low-frequency harmonic generator to your signal, enhancing the perceived bass depth and fullness.
- VOLUME: Master volume control for the amplifier output.
- POWER: On/Off switch for the amplifier. The red LED indicates power status.
- MP3 / LINE IN: 3.5mm stereo jack for connecting external audio devices like MP3 players or smartphones.
- EM. OUT & PHONES: 3.5mm stereo jack for connecting headphones for silent practice or for sending an emulated line-level signal to a recording device or mixer.
4. Operating Instructions
Playing Your Bass Guitar
- Ensure your bass guitar is connected to the INPUT jack.
- Turn the VOLUME knob to its minimum.
- Switch the POWER to 'ON'. The red LED will illuminate.
- Slowly increase the VOLUME to your desired listening level.
- Adjust the GAIN, EQ (DEPTH), and COMP (RATIO) controls to shape your tone. Engage the 'OD' button for overdrive or the 'SUB' button for enhanced bass.

Figure 4.1: The Blackstar Fly 3 Bass amplifier in use with a bass guitar.
Using the MP3 / Line Input
The MP3 / Line Input allows you to play along with your favorite tracks.
- Connect your external audio device (e.g., smartphone, MP3 player) to the MP3 / LINE IN jack using a 3.5mm stereo cable.
- Start playback on your audio device.
- Adjust the volume on your audio device to balance it with your bass guitar's volume. The amplifier's VOLUME control will affect both signals.
Silent Practice / Recording
For silent practice or direct recording, use the Emulated Line Out & Phones jack.
- Connect your headphones or recording interface to the EM. OUT & PHONES jack.
- The amplifier's speaker will be muted when headphones are connected.
- Adjust the VOLUME knob to control the headphone or line output level.
5. Maintenance
To ensure the longevity and optimal performance of your Blackstar Fly 3 Bass amplifier, follow these maintenance guidelines:
- Cleaning: Use a soft, dry cloth to clean the exterior of the amplifier. Avoid using abrasive cleaners or solvents.
- Storage: Store the amplifier in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care: If the amplifier will not be used for an extended period, remove the batteries to prevent leakage and potential damage.
- Handling: Handle the amplifier with care. Avoid dropping it or exposing it to excessive shock.
6. Troubleshooting
If you encounter issues with your Blackstar Fly 3 Bass amplifier, refer to the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound from speaker |
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| Distorted or poor sound quality |
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| MP3/Line In not working |
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If the problem persists after trying these steps, please contact Blackstar customer support.
7. Specifications

Figure 7.1: Dimensions of the Blackstar Fly 3 Bass Mini Amplifier.
| Feature | Detail |
|---|---|
| Brand | BLACKSTAR |
| Model Name | Blackstar FLY-BASS Combo |
| Model Number | FLY3BASS |
| Output Power | 3 Watts |
| Speaker Size | 2 Inches |
| Amplifier Type | Solid State |
| Power Source | Battery Powered (6x AA) |
| Inputs | 1/4" Instrument Input, 3.5mm MP3/Line In |
| Outputs | 3.5mm Emulated Line Out & Headphones |
| Controls | Gain, OD Switch, EQ (Depth), Comp (Ratio), Sub Switch, Volume |
| Dimensions (D x W x H) | 14.2 cm x 19.3 cm x 10.9 cm |
| Material | Plastic |
| Color | Black |
| Compatible Devices | Bass guitar, upright bass, electric upright |
8. Warranty and Support
Warranty Information
The Blackstar Fly 3 Bass amplifier comes with a 6-year warranty from the date of purchase. This warranty covers manufacturing defects and ensures your product is free from material and workmanship flaws under normal use.
Please retain your proof of purchase for warranty claims. The warranty does not cover damage caused by misuse, accidents, unauthorized modifications, or normal wear and tear.
Customer Support
For technical assistance, warranty claims, or any questions regarding your Blackstar Fly 3 Bass amplifier, please visit the official Blackstar Amplification website or contact their customer support directly.
Website: www.blackstaramps.com
Refer to the website for contact details specific to your region.







