Kenwood KMM-BT228U Digital Media Receiver User Manual

1. Introduction

This manual provides detailed instructions for the installation, operation, and maintenance of your Kenwood KMM-BT228U Digital Media Receiver. Please read this manual thoroughly to ensure proper use and to maximize the performance of your device. The KMM-BT228U is designed to provide high-quality audio playback and seamless smartphone integration in your vehicle.

2. Safety Information

• Do not operate the unit in a way that distracts you from driving. Always prioritize road safety.
• Ensure proper wiring and installation to prevent short circuits or damage. Consult a professional for installation if you are unsure.
• Avoid exposing the unit to moisture or extreme temperatures.
• Do not attempt to disassemble or modify the unit. This may void the warranty and cause damage.
• Keep the volume at a level that allows you to hear outside sounds, such as emergency vehicles.

3. Package Contents

Verify that all items are present in the package:

• Kenwood KMM-BT228U Receiver
• Wiring Harness
• Installation Hardware
• Instruction Manual (this document)
• External Microphone

4. Product Overview

4.1 Front Panel Controls

The front panel provides access to all primary functions of the receiver.

Image: Front view of the Kenwood KMM-BT228U Digital Media Receiver, showing the display, rotary encoder, source button, Bluetooth call buttons, and preset buttons.

• Power/Source (SRC) Button: Turns the unit on/off and cycles through input sources.
• Rotary Encoder: Controls volume, navigates menus, and selects options.
• Display: 1.5-line LCD display showing current source, track information, and menu options.
• Bluetooth Call Buttons: For answering and ending calls.
• USB Port: Front-panel USB input for media playback and device charging.
• AUX Input: Front-panel 3.5mm auxiliary input.
• Preset Buttons (1-6): For radio station presets and direct function access.

5. Setup and Installation

Proper installation is crucial for optimal performance and safety. It is recommended to have the unit installed by a qualified professional.

5.1 Wiring Connections

Connect the included wiring harness to your vehicle's electrical system and speakers. Ensure all connections are secure and properly insulated.

Image: Rear view of the Kenwood KMM-BT228U, showing the main wiring harness connector, RCA preamp outputs, antenna input, and the included external microphone.

• Power Wires: Connect the yellow wire to constant 12V, red wire to switched 12V (ignition), and black wire to ground.
• Speaker Wires: Connect to your vehicle's speakers, observing correct polarity. The built-in amplifier provides 22 watts RMS/50 peak x 4 channels.
• Antenna: Connect your vehicle's antenna cable.
• Preamp Outputs: Two-channel (2.5-volt) preamp outputs are available for connecting external amplifiers.
• Microphone: Connect the external microphone for hands-free calling. Position it in a location that provides clear voice pickup.
• Steering Wheel Control: The unit is compatible with most factory steering wheel audio controls (an adapter, sold separately, is required).

5.2 Mounting

Mount the receiver securely in your vehicle's dashboard using the provided hardware. Ensure adequate clearance for wiring and ventilation.

6. Operating Instructions

6.1 Basic Operation

• Power On/Off: Press the SRC button to turn the unit on. Press and hold SRC to turn it off.
• Source Selection: Press SRC repeatedly to cycle through available sources (Tuner, Bluetooth, USB, AUX).
• Volume Control: Rotate the rotary encoder to adjust the volume level.
• Menu Navigation: Press the rotary encoder to enter the menu. Rotate to navigate and press again to select.

6.2 Bluetooth Functionality

The KMM-BT228U features built-in Bluetooth Version 4.2 for wireless audio streaming and hands-free calling.

1. Pairing a Device:
   • Ensure Bluetooth is enabled on your smartphone.
   • On the receiver, select the Bluetooth source.
   • Search for available devices on your smartphone and select "KMM-BT228U".
   • Confirm the pairing code if prompted.
2. Music Mix: This feature allows music streaming and control from up to five paired smartphones.
3. Hands-Free Calling: Use the dedicated call buttons on the front panel to answer or end calls. Your voice will be picked up by the external microphone.

6.3 USB and Auxiliary Input

• USB Playback: Connect a USB device to the front USB port. The unit supports MP3, WAV, AAC, WMA, FLAC, and high-res WAV music files. The USB port also provides rapid charging for select devices (1.5A).
• Auxiliary Input: Connect portable audio players to the front 3.5mm auxiliary input using a stereo mini-jack cable.

6.4 Audio Settings

Customize your audio experience using the following features:

• 13-Band Equalizer: Adjust frequency bands to fine-tune the sound output.
• Digital Time Alignment: Optimizes sound staging by delaying audio to specific speakers, ensuring sound reaches your ears simultaneously.
• Drive EQ: Automatically adjusts audio settings to compensate for exterior noise, improving sound clarity while driving.
• High-Pass and Low-Pass Filters: Apply filters to front, rear, and subwoofer outputs to optimize speaker performance and prevent distortion.

6.5 Smartphone Integration

• Kenwood Remote App: Download the Kenwood Remote App to control receiver settings directly from your smartphone.
• Pandora and Spotify: Control these internet radio services directly from the receiver when connected to an iPhone or Android device.
• iAP2 Support: For Apple Music and iTunes Radio playback.

7. Maintenance

• Cleaning: Use a soft, dry cloth to clean the unit's front panel. Do not use abrasive cleaners or solvents.
• Removable Faceplate: The faceplate is theft-deterrent and can be removed for security. Handle it carefully to avoid damage.

8. Troubleshooting

If you encounter issues, refer to the following common problems and solutions:

If the problem persists after attempting these solutions, please contact Kenwood customer support or your authorized dealer.

9. Specifications

10. Warranty and Support

For warranty information and customer support, please refer to the warranty card included with your product or visit the official Kenwood website. Keep your purchase receipt as proof of purchase for warranty claims.

For further assistance, you may contact Kenwood customer service directly.