1. Introduction
This manual provides essential information for the safe and effective use of your Positive Grid BIAS Mini Guitar Amplifier. Please read this manual thoroughly before operating the device and retain it for future reference. The BIAS Mini Guitar Amplifier is a compact yet powerful amplifier head designed for guitarists, offering versatile tone shaping and integration with advanced software capabilities.
2. Setup
Follow these steps to set up your BIAS Mini Guitar Amplifier for the first time.
2.1 Rear Panel Connections Overview
Image: Rear panel of the BIAS Mini Guitar Amplifier, detailing power input, vent holes, send/return, MIDI in/out, footswitch, USB, line out, and speaker out connections.
2.2 Power Connection
Connect the supplied AC power cable to the POWER inlet on the rear panel of the BIAS Mini. Ensure the power cable is securely connected to a grounded power outlet. The unit supports AC 100-240V, MAX 10A, 50-60Hz.
Image: Close-up view of the AC power input socket on the rear panel.
2.3 Speaker Output
Connect your guitar speaker cabinet to the SPEAKER OUT jack. This output is designed for 4-16 Ohm speaker cabinets. NOTICE: Do not connect with effect units, DI boxes, powered speakers, or any other grounded devices to this output.
Image: Close-up view of the SPEAKER OUT jack, indicating 4-16 Ohm compatibility and a warning against connecting to inappropriate devices.
2.4 Instrument Input
Connect your guitar to the INPUT jack on the front panel of the amplifier.
2.5 Effects Loop (Send/Return)
The BIAS Mini includes a mono effects loop. Use the SEND and RETURN jacks to integrate your external effects pedals into the signal chain. This loop is seamless and will not mute when recalling patches.
Image: Close-up view of the SEND and RETURN jacks for connecting external effects.
2.6 MIDI Connectivity
The BIAS Mini features 1/8-inch connectors for MIDI IN and MIDI OUT, allowing for external control and synchronization. A dedicated adapter cable is included for these connections.
Image: Close-up view of the MIDI IN and OUT ports.
2.7 Footswitch Input
Connect an external footswitch to the FOOTSWITCH input for hands-free control of various functions.
Image: Close-up view of the FOOTSWITCH input jack.
2.8 Line Out and USB
The LINE OUT provides a balanced XLR output for connecting to mixing consoles or audio interfaces. A GROUND LIFT switch is available to eliminate hum. The USB port allows connection to a Mac or PC for software integration and control.
Image: Close-up view of the LINE OUT (XLR) with Ground Lift switch and the USB port.
2.9 Ventilation
Ensure that the vent holes on the rear panel are not covered to prevent overheating and ensure proper operation of the device.
Image: Close-up view of the ventilation holes and associated warning on the rear panel.
3. Operating Instructions
The BIAS Mini Guitar Amplifier offers a straightforward interface for immediate use, along with advanced customization options via software.
3.1 Basic Controls
The front panel features standard amplifier controls:
- Preset: Selects one of the 16 built-in custom amp presets.
- Gain: Adjusts the input signal level and distortion.
- Bass: Controls the low-frequency response.
- Mid: Adjusts the mid-range frequency response.
- Treble: Controls the high-frequency response.
- Master: Adjusts the overall output volume.
- Output Button: Toggles between amplifier, headphones, line output, and FX send to control the output destination.
The built-in 300 watts @ 4 ohms (150W@8Ω) Class D power amplifier provides ample power for various applications, from recording to live performances.
3.2 Built-in Noise Gate
The BIAS Mini includes a built-in noise gate to help reduce unwanted noise and hum, ensuring a cleaner signal.
3.3 Wireless Control via Bluetooth
With built-in Bluetooth, you can wirelessly control your BIAS Mini from compatible mobile devices, offering convenient remote adjustment of settings.
4. Software Integration
Unlock the full potential of your BIAS Mini Guitar Amplifier by integrating it with the included BIAS AMP 2 Pro software.
4.1 BIAS AMP 2 Pro Software
The BIAS Mini comes with the full version of BIAS AMP 2 Pro software. This software allows you to:
- Create and load unique amplifiers from scratch, customizing them to your playing style.
- Combine different preamp and power amp circuits.
- Modify virtual vacuum tubes, transformers, clipping diodes, and rectifiers in real-time.
- Load custom Impulse Responses (IRs) and even send only the IR to the line output.
This component-level emulation engine provides an authentic and dynamic amplifier modeling experience.
4.2 AMP Match Function
Utilize the AMP Match function within the BIAS AMP 2 Pro software to capture and reproduce the sound of any hardware amplifier. This allows you to digitally preserve the tone of vintage amplifiers or your favorite custom setups without concerns about physical wear and tear.
4.3 ToneCloud Integration
Positive Grid's ToneCloud, accessible via BIAS AMP/FX, is an extensive online community and repository of custom amplifier presets. You can:
- Share your own custom tones with a global community of musicians.
- Download thousands of custom amplifiers uploaded by artists, recording studios, and fellow guitarists.
- Backup and download your presets to and from the cloud.
This feature provides endless possibilities for tone exploration and sharing.
4.4 Official Product Video
Video: A demonstration of the Positive Grid BIAS Mini Guitar Amplifier's sound capabilities and features, showcasing various guitar tones and software integration.
5. Maintenance
Proper maintenance ensures the longevity and optimal performance of your BIAS Mini Guitar Amplifier.
- Cleaning: Use a soft, dry cloth to clean the exterior of the unit. Avoid using abrasive cleaners, solvents, or waxes, as they may damage the finish.
- Storage: Store the amplifier in a cool, dry place away from direct sunlight, extreme temperatures, and high humidity.
- Ventilation: Always ensure that the ventilation holes are clear and unobstructed to prevent overheating.
- Power Off: Always power off the unit and disconnect it from the power source when not in use or during electrical storms.
6. Troubleshooting
If you encounter issues with your BIAS Mini Guitar Amplifier, refer to the following common solutions:
| Problem | Possible Solution |
|---|---|
| No power | Check if the power cable is securely connected to both the amplifier and the power outlet. Ensure the power outlet is functional. |
| No sound output | Verify that your guitar is properly connected to the input. Check speaker connections and ensure the speaker cabinet is functional. Confirm the Master volume is turned up and the Output button is set to the correct output (e.g., Amplifier). |
| Distorted or unwanted noise | Check instrument cables for damage. Ensure the Gain level is not excessively high. Utilize the built-in noise gate. If using the Line Out, try engaging the Ground Lift switch. |
| Cannot connect via Bluetooth/USB | Ensure Bluetooth is enabled on your mobile device and the amplifier is in pairing mode. For USB, check cable connections and ensure the correct drivers are installed on your computer. Restart both the amplifier and your computer/mobile device. |
If the problem persists, please contact Positive Grid customer support.
7. Specifications
- Amplifier Type: Guitar Amplifier Head
- Emulation Engine: Component-level emulation
- Presets: 16 built-in custom amp presets (thousands downloadable via ToneCloud)
- Power Amplifier: 300W Class D (300W@4Ω, 150W@8Ω)
- Effects Loop: Seamless mono effects loop (Send/Return)
- Noise Gate: Built-in
- MIDI: 1/8-inch MIDI Input/Output (dedicated adapter cable included)
- Footswitch Input: Yes
- Wireless Control: Built-in Bluetooth for mobile devices
- Computer Connectivity: USB for Mac/PC
- Software Included: BIAS AMP 2 Pro (full version)
- Cloud Integration: ToneCloud for preset backup/download
- IR Loading: Custom IR loading, IR-only send to line output
- Amp Matching: Amp Match custom amp preset loading and operation
- Dimensions (W x H x D): 26.6 x 4.6 x 24.8 cm
- Weight: Under 2.4 kg
8. Warranty & Support
Positive Grid products are designed for reliability and performance. For warranty information, please refer to the warranty card included with your product or visit the official Positive Grid website. For technical support, product registration, or further assistance, please visit www.positivegrid.com/support.
Please have your product model and serial number ready when contacting support.