JUSTPRO MD-MINIPRO-Blue

JUSTPRO Mini Portable Wireless Guitar Amplifier User Manual

Model: MD-MINIPRO-Blue

Introduction

Thank you for choosing the JUSTPRO Mini Portable Wireless Guitar Amplifier. This versatile amplifier is designed for guitarists seeking a compact, rechargeable solution with a wide range of effects and connectivity options for practice and recording. Please read this manual thoroughly to ensure proper use and maintenance of your amplifier.

JUSTPRO Mini Portable Wireless Guitar Amplifier, blue color, with a black handle on top.

Figure 1: JUSTPRO Mini Portable Wireless Guitar Amplifier

Safety Information

  • Do not expose the amplifier to water or excessive moisture.
  • Avoid placing the amplifier near heat sources or in direct sunlight.
  • Use only the provided USB cable for charging.
  • Do not attempt to disassemble or modify the amplifier. This will void the warranty.
  • Keep out of reach of children.
  • Ensure proper ventilation when in use.

Package Contents

Verify that all items are present in the package:

  • Guitar Amp
  • USB Cable

Product Overview

Controls and Interfaces

Top view of the amplifier showing all controls and input/output jacks with numbered labels.

Figure 2: Amplifier Controls and Interfaces

Table 1: Control Functions
No.Control/InterfaceFunction
1MASTERAdjusts the overall output volume of the amplifier.
2A-CLEAN / B-OVERDRIVE / C-DISTORTION SwitchSelects between Clean, Overdrive, and Distortion effects.
3BASSAdjusts the low-frequency response.
4TREBLEAdjusts the high-frequency response.
5R-ROOM / R-HALL / CHORUS / DELAY KnobSelects and adjusts the level of Reverb (Room/Hall), Chorus, or Delay effects.
6POWER / BT ButtonPowers the unit on/off and activates Bluetooth pairing mode.
7HEADPHONE Jack3.5mm output for private practice with headphones.
8AUX/REC Jack3.5mm input for external audio sources or output for recording.
9INPUT Jack6.35mm input for connecting your guitar.
10DC-5V Charging PortMicro USB port for charging the amplifier.

Key Features

  • All-in-One Combo Amp: Features 7 built-in effects including Reverb (Room/Hall), Chorus, Delay, Clean, Overdrive, and Distortion.
    Diagram showing 7 effects: Room Reverb, Chorus, Hall Reverb, Delay, Clean, Overdrive, Distortion.

    Figure 3: Integrated Effects

  • Wireless BT Audio Design: Seamlessly stream backing tracks or drum machine apps from your phone via Bluetooth.
    A person playing an electric guitar with the amplifier on a table, connected to a laptop via Bluetooth.

    Figure 4: Bluetooth Connectivity in Use

  • Rich Interfaces: Built-in Aux/Rec, Input, and Headphone interfaces for versatile connectivity.
    Diagram showing the amplifier's rich interfaces: Aux/Rec, Headphone, and Input jacks with their respective uses.

    Figure 5: Rich Interface Options

  • Full Wooden Shell Body: Crafted from high-quality wood with a piano painting finish for durability and aesthetic appeal.
    Image illustrating the amplifier's full wooden shell body and piano painting process.

    Figure 6: Wooden Shell Body Construction

  • Rechargeable Battery: Integrated rechargeable battery provides up to 3.5 hours of playtime on a single charge.
    Image showing the 5V Micro USB charging port and indicating 3.5 hours of strong battery life.

    Figure 7: Charging Port and Battery Life

  • Mini Portable Design: Compact size (7.8*5.1*7.1 inches) with a convenient leather handle for easy transport.
    A person practicing guitar with the portable amplifier on a coffee table.

    Figure 8: Portable Design in a Practice Setting

Setup

  1. Charging the Amplifier:

    Before first use, fully charge the amplifier using the provided USB cable. Connect the USB cable to the DC-5V charging port (10) on the amplifier and the other end to a standard USB power adapter (not included) or a computer USB port. The charging indicator light will show charging status.

  2. Powering On/Off:

    Long press the POWER / BT button (6) for 2 seconds to turn the amplifier on or off.

Operating Instructions

Connecting Your Guitar

  1. Ensure the amplifier is powered on.
  2. Connect your guitar to the INPUT Jack (9) using a standard 6.35mm instrument cable.
  3. Adjust the MASTER volume (1) to a comfortable listening level.

Using Effects

The amplifier offers 7 built-in effects:

  • Clean, Overdrive, Distortion: Use the A-CLEAN / B-OVERDRIVE / C-DISTORTION switch (2) to select your desired tone.
    Image showing the three channel switch for Clean, Overdrive, and Distortion effects.

    Figure 9: Three Channel Selection

    Demonstration of effects:

    Video 1: Demonstration of Clean, Overdrive, and Distortion effects on the amplifier.

  • Reverb (Room/Hall), Chorus, Delay: Rotate the R-ROOM / R-HALL / CHORUS / DELAY knob (5) to select and adjust the intensity of these effects.
    Image showing the EFX volume control knob for Reverb (Room/Hall), Chorus, and Delay effects.

    Figure 10: EFX Volume Control

Bluetooth Connectivity

  1. Step 1: Activate Bluetooth on Amplifier

    Long press the POWER / BT button (6) for 2 seconds. The BT indicator light will flash, indicating it's in pairing mode.

  2. Step 2: Pair with Your Device

    On your phone or other Bluetooth-enabled device, open Bluetooth settings. Find "MINI pro" in the available devices list and select it to pair. Once paired, the BT indicator light will stop flashing and remain solid.

    Two amplifiers demonstrating the two steps for easy wireless Bluetooth connection with a smartphone.

    Figure 11: Easy Wireless Connection Steps

Using AUX/REC and Headphone Jacks

  • AUX/REC (8): Connect an external audio source (e.g., MP3 player, phone) using a 3.5mm 4-pole audio cable (not included) to play along with music. This port can also be used to output audio for recording.
  • HEADPHONE (7): Connect 3.5mm headphones for silent practice. The main speaker output will be muted when headphones are connected.

Maintenance

  • Clean the amplifier with a soft, dry cloth. Do not use abrasive cleaners or solvents.
  • Store the amplifier in a cool, dry place away from direct sunlight and extreme temperatures.
  • If not used for an extended period, charge the battery every 3 months to maintain its lifespan.

Troubleshooting

Table 2: Common Issues and Solutions
ProblemPossible CauseSolution
No sound from amplifier.Amplifier is off; Volume is too low; Guitar cable is not connected properly; Headphones are connected.Ensure amplifier is on; Increase MASTER volume; Check guitar cable connection; Disconnect headphones.
Bluetooth not connecting.Amplifier not in pairing mode; Device Bluetooth is off; "MINI pro" not selected.Long press POWER/BT button to enter pairing mode (flashing light); Ensure Bluetooth is enabled on your device; Select "MINI pro" from your device's Bluetooth list.
Poor sound quality.Low battery; Incorrect effect setting; Cable issues.Charge the amplifier; Adjust BASS/TREBLE knobs and effect settings; Try a different guitar cable.
Short battery life.Battery not fully charged; Old battery.Ensure full charge before use; Battery lifespan naturally decreases over time.

Specifications

Table 3: Product Specifications
FeatureDetail
BrandJUSTPRO
Model NumberMD-MINIPRO-Blue
Output Wattage5 Watts
Product Dimensions5.1 x 7.8 x 7 inches (13 x 20 x 18 cm)
Item Weight3.94 pounds (1.79 kg)
Material TypeWood
Power SourceBattery Powered
Battery TypeLithium Ion (1 included)
ConnectivityBluetooth, 6.35mm Jack (Input), 3.5mm Jack (Aux/Rec, Headphone)
EffectsReverb (Room/Hall), Chorus, Delay, Clean, Overdrive, Distortion

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