MC420B / MCBK420B

Introduction

This product features two speaker pods and an external amplifier, designed for installation on the handlebars of motorcycles or the cage bars of UTV vehicles. The applicable mounting bar diameter ranges from 0.75 to 1.25 inches. Users can stream audio wirelessly via Bluetooth from a mobile phone or play music from an external device using the 3.5mm audio input. The system includes an inline power switch and volume control. It is water-resistant but should not be submerged in water. Connect only to a 12VDC power source.

Package Contents

Upon unpacking, verify that the package contains the following items. Contact the store of purchase if any item is missing:

• 2 x Speaker pods
• 1 x Bluetooth amplifier (with power-volume knob/speaker/power/AUX cables)
• 1 x Power cable harness (with a 7.5A inline fuse)
• 2 x Clamp mounting kits (pre-attached to the speakers)
• 1 x Amplifier mounting kit (four screws/plain washers/spring washers)
• 4 x Rubber mounting shims
• 1 x Cable zip tie
• 1 x Spare 7.5A fuse
• User Manual / Warranty card

Important

Read and understand all instructions before use. Failure to follow instructions may result in personal injury or property damage and will void the warranty.

Important Safety Precautions

• Do not increase speaker volume to a level that prevents hearing your surroundings.
• Use caution or temporarily discontinue use in potentially hazardous situations.
• Do not adjust the product while driving or in situations where distractions can be hazardous. Safe driving is paramount.
• Start volume at a low setting and gradually increase it for comfortable listening without distortion or ear discomfort.
• If smoke, strange noise, or odor is detected, or if abnormal operational signs appear, immediately disconnect the product from the power supply. Discontinue use and contact technical support to prevent permanent damage.
• Servicing should only be performed by a qualified technician.

Installation Precautions

• WARNING: Always consult a professional installer for installation.
• Contact technical support for any installation-related questions.
• Before installation, disconnect the negative terminal of the vehicle battery to prevent damage, fire, or injury.
• Use only provided installation parts; other methods may void the warranty.
• Observe safety and operating instructions of connected devices.
• Important! Replace faulty fuses only with the same type and rating to avoid damage or fire.
• Clean the product with a dry, fiber-free cloth. Do not use aggressive cleaning agents.
• The product is water-resistant against splashing water but should not be submerged.

Environmental Care

Dispose of the product responsibly at the end of its life according to local laws for electronic waste to help preserve the environment.

Mounting

Refer to "Installation Precautions" on page 2. Ensure connection cables are kept away from pinch points, moving parts, and hot exhausts. Do not install speakers where they might obstruct the rider's view or safety features (lights, horns, brake levers, etc.). Carefully investigate the vehicle's layout before drilling, paying special attention to fuel tanks, lines, hydraulics, and wiring. Always check mounting security before each ride.

Mounting the Speaker Pods

1. Find a safe and ideal mounting location on the handlebar, ensuring speakers do not obstruct the rider's view or safety features.
2. The supplied clamp is pre-attached to the speaker bottom. Unfasten the clamp using the mounting nuts.
3. Fit the clamp around the vehicle's handlebar. Attach the supplied rubber shims over the mounting bar to secure clamping and prevent abrasion.
4. Re-fasten the mounting nuts to tighten the clamp. Adjust the speaker to point directly at the rider before fully tightening.

Diagram Description: The illustration shows a speaker clamp (labeled 'c') attached to a mounting bar (labeled 'd') with a mounting nut (labeled 'a') and a rubber shim (labeled 'b') positioned between them. The mounting bar is specified to be between 0.75 and 1.25 inches in diameter.

Mounting the Amplifier

Secure the power amplifier in the vehicle using the supplied screws. Ensure sufficient air circulation around the mounting location.

1. Find a suitable location for the amplifier.
2. Secure the amplifier:
   1. Use the four screw holes on the amplifier to mark mounting holes on the surface.
   2. Drill the mounting holes.
   3. Position the amplifier and attach it using the four supplied screws, spring washers, and plain washers.

Diagram Description: A diagram illustrates a rectangular amplifier with four screw holes on its top surface. It shows the process of marking mounting holes on a surface, drilling them, and then attaching the amplifier using screws and washers.

Mounting the Power/Volume Knob

Mount the power/volume knob in a safe, easily accessible location that does not impede the rider's ability to drive safely. Secure it using the supplied zip tie.

Wiring

Refer to "Installation Precautions" on page 2. For safety, disconnect the vehicle battery's negative terminal before wiring. Keep cables away from pinch points, moving parts, and hot exhausts. Secure connected cables. Reconnect the battery's negative terminal only after all connections are correctly and securely made.

Power Source Connection

Option 1: Direct Connection to Vehicle Battery

Note: Direct connection to the battery consumes power. Always use the inline power/volume knob to cut battery power when speakers are not in use.

1. Using the supplied power cable harness, connect the black cable ("GROUND") to the vehicle's metal frame or the negative battery terminal, and the red cable ("+12V") to the positive battery terminal.
2. Connect the power cable harness to the "POWER" connector attached to the amplifier.

Option 2: Connection to Ignition Switch

Connecting to the vehicle's ignition switch allows the speakers to power on/off automatically with the ignition.

1. Locate and identify two power wires in the ignition switch: one for switched +12V and one for negative/ground.
2. Using the supplied power cable harness, connect the black cable ("GROUND") to the accessory power's negative/ground wire and the red cable ("+12V") to the accessory power's switched +12V wire. Insulate connections with electrical tape.
3. Connect the power cable harness to the "POWER" connector attached to the amplifier.

Wiring Overview

Diagram Description: The wiring diagram shows the amplifier unit with connections for Bluetooth, Power/Volume knob, and 3.5mm audio input. It details the power connection, including a 7.5A fuse, linking to the vehicle's battery (positive and negative terminals) and metal frame. Connections for the power/volume knob and speaker cables are also illustrated.

Connection Labels:

• A: Connect the power cable harness. Refer to the "Power Source Connection" section for complete instructions.
• B: Connect the speaker cable harnesses.
• C: Connect your mobile phone or MP3 player for audio input using an audio cable (e.g., 3.5mm audio cable or adapter).

Bluetooth Streaming

To stream music from your mobile device (iOS or Android) via Bluetooth, pair the device with the product.

1. Power on the product by rotating the inline power/volume knob.
2. On your mobile device, enable Bluetooth and select "Boss Audio MC420B" or "Boss Audio MCBK420B" to pair. If prompted for a password, enter "0000". Note: Only one device can be paired at a time.
3. Upon successful pairing/connection, a confirmation tone will sound. Play audio on your mobile device; it will stream to the product. Rotate the inline power/volume knob to adjust volume.

After initial pairing, the product will automatically connect to your mobile device when both are powered on. To change the Bluetooth source, disconnect the current device and repeat Step 2 to pair with a new device.

Note: Operating this product consumes vehicle battery power. Run the vehicle engine to avoid battery exhaustion. Operational range may be reduced by obstacles. Devices will disconnect if out of range and automatically reconnect when back in range.

AUX Input

Listen to external audio devices (e.g., mobile phone, MP3 player) through this product.

1. Power on the product (rotate the inline power/volume knob) and ensure it is not connected via Bluetooth.
2. Connect the 3.5mm audio input jack of the speaker to your mobile phone's audio output connector using an appropriate audio cable:
   • For phones with a 3.5mm headphone jack: use a 3.5mm audio cable (not included).
   • For phones with a USB-C port: use a USB-C to 3.5mm audio cable (not included).
   • For iPhones: use a Lightning to 3.5mm audio cable (not included).
3. Play audio files from your device. The audio will play through the product. Rotate the inline power/volume knob to adjust volume.

For optimal audio performance, set the mobile device's volume to maximum. If distortion occurs, slightly lower the connected device's volume.

Note: Operating this product consumes vehicle battery power. Run the vehicle engine to avoid battery exhaustion.

Troubleshooting

If you encounter issues, check the following points before contacting technical support.

Specifications

Bluetooth

• Bluetooth version: 5.0 / EDR
• Bluetooth profiles: A2DP
• Bluetooth frequency: 2402 – 2480 MHz
• Transmission power: <4 dBm
• Transmission distance: Up to 33 ft / 10 m (line of sight)

Audio

• Speaker driver: 3" (76 mm)
• Speaker impedance: 4Ω
• Frequency response: 50 Hz – 15 KHz
• Total harmonic distortion (THD): <0.1%
• Signal-to-noise ratio: >75 dB
• Channel separation: >50 dB
• Input sensitivity: 500 mV

Amplifier

• Amplifier class: Class D, full range
• Input impedance: 10 kΩ
• Dimensions: 3.6" x 2.3" x 1.5" (91 x 58 x 38 mm)

General

• Power supply: 12VDC (allowable 10 – 16VDC)
• Current consumption: max. 5A
• Fuse: ATO type, 7.5A
• Clamp range (Ø): 0.75" - 1.25"
• Cable length: 3.6'/1.1 m (speaker cable); 6.2'/1.9 m (power cable); 6.2'/1.9 m (power/volume knob cable); 1.9'/0.6 m (Aux input cable)
• Speaker Dimensions: 4.7" x 6.3"x 4.7" (120 x 160 x 120 mm)

Specifications are subject to change without notice.

Contact Information

BOSS Audio Systems

3451 Lunar Court - Oxnard, CA 93030

Website: www.bossaudio.com

Customer Service: 805-751-4853

Tech Support: www.bossaudio.com/support

The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by BOSS Audio Systems is under license. Other trademarks and trade names are those of their respective owners.