Kenwood KMR 550U Manual

The Kenwood KMR 550U is a single-DIN digital media receiver featuring Bluetooth connectivity, USB input, auxiliary input, AM/FM radio with 18 presets, built-in amplifier, remote control compatibility, and customizable audio settings. Designed for in-car entertainment with easy installation and user-friendly interface. Below are key sections for features, installation, operation, settings, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Bluetooth Pairing 8. Audio Settings 9. Care & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Digital media receiver, Remote Control, USB port, AUX input, Bluetooth antenna, Wiring harness.

Feature	Description
Bluetooth connectivity	For hands-free calling and audio streaming
USB port	For USB flash drives and device charging
AUX input	3.5mm auxiliary input for external audio devices
AM/FM radio	18 preset stations (12 FM, 6 AM)
Built-in amplifier	4 x 50W maximum power output
Remote control ready	Compatible with optional remote control
Source button	Cycles through audio sources
Volume knob	Rotary control for volume adjustment
Power button	Turns unit on/off
Eject button	For CD ejection (if applicable)

Installation

Unpack and inspect contents. Ensure proper vehicle compatibility.

Disconnect vehicle battery: Remove negative terminal for safety.
Remove existing stereo: Use removal tools for your vehicle model.
Connect wiring harness: Match color-coded wires to vehicle harness.
Connect antenna and Bluetooth adapter: Attach to designated ports.
Secure unit in dash: Insert and lock into mounting sleeve.
Reconnect battery and test functions.

WARNING! Disconnect battery before installation to prevent electrical shorts. Professional installation recommended.

First-Time Setup

Power on unit; follow initial configuration steps.

Set clock: Press and hold SETUP, navigate to clock settings.
Pair Bluetooth: Enable pairing mode and connect mobile device.
Program radio presets: Tune to desired stations and save to presets.
Adjust audio settings: Set bass, treble, balance, and fader to preference.
Configure display: Set dimmer and illumination settings.

CAUTION! Do not operate while driving. Park vehicle for initial setup.

Specifications

Chassis Size: Single-DIN
Power Output: 4 x 50W max (4 x 22W RMS)
Bluetooth Version: 3.0 with A2DP and HFP
Frequency Response: 20Hz - 20kHz
Signal-to-Noise Ratio: >80dB
Supported Formats: MP3, WMA, AAC
USB Support: Up to 32GB FAT32
Power Requirement: 12V DC, negative ground
Operating Temperature: -20°C to 60°C

Controls and Settings

Access settings via SETUP button. Front Panel: POWER, VOLUME, SOURCE, BAND, MENU.

Remote Functions: POWER, VOLUME, MUTE, SOURCE, PRESET, SEEK, PLAY/PAUSE.

Audio Settings: BASS, TREBLE, BALANCE, FADER, LOUDNESS. Radio: AUTO STORE, LOCAL/DX, REGIONAL. Bluetooth: PAIRING, PHONEBOOK, CALL HISTORY. System: CLOCK, DISPLAY, RESET, BEEP.

Connecting Devices

USB: Front/rear port for flash drives. AUX: 3.5mm input for external audio. Bluetooth: Wireless audio and calling.

Turn off vehicle before connecting devices.
Connect USB drive: Insert into USB port (supports up to 32GB).
Connect AUX device: Use 3.5mm cable from device to AUX input.
Select source: Press SOURCE to cycle through available inputs.

Tip: Format USB drives as FAT32 for best compatibility.

Bluetooth Pairing

Supports hands-free calling and audio streaming.

Enable pairing: Press and hold PHONE button until "PAIRING" appears.
Search on device: Enable Bluetooth on mobile device, search for "KENWOOD".
Connect: Select "KENWOOD" from available devices list.
Confirm pairing: Enter PIN "0000" if prompted.
Test connection: Make test call or play audio.

WARNING! Do not pair devices while driving. Keep attention on the road.

Audio Settings

Customize sound with built-in equalizer and audio controls.

Bass/Treble: Adjust low and high frequencies (-7 to +7)
Balance/Fader: Control speaker output distribution
Loudness: Enhance low-volume listening
Subwoofer Control: Adjust subwoofer output (if connected)
Audio Presets: FLAT, POP, ROCK, JAZZ, CLASSICAL

Care & Maintenance

Clean with dry, soft cloth only. Avoid liquids and abrasive cleaners.

CAUTION! Do not use chemical cleaners. Keep unit dry and avoid extreme temperatures.

Regulatory Information

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Wiring/fuse	Check fuse, wiring connections, and battery connection.
Bluetooth not connecting	Pairing mode/distance	Ensure pairing mode active; move device closer; delete old pairing.
USB not recognized	Format/capacity	Reformat as FAT32; ensure drive under 32GB; try different USB drive.
Poor radio reception	Antenna connection	Check antenna connection; extend antenna fully; avoid obstructions.
No sound from speakers	Settings/wiring	Check volume, mute, balance/fader settings; verify speaker connections.

Reset: Press RESET button with thin object or disconnect battery for 30 seconds.

Service: Contact authorized Kenwood service center; www.kenwood.com