Kenwood XXV-01D Manual

The Kenwood XXV-01D is a high-performance car audio amplifier featuring MOSFET power supply, variable low-pass filter, bass boost, speaker level inputs, preamp outputs, and thermal/overload/short circuit protection. With 1000 watts max power output and 4-ohm stable operation, it delivers exceptional sound quality for car audio systems. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

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

Features at a Glance

Key components: MOSFET power supply, variable low-pass filter, bass boost control, speaker level inputs, preamp outputs, thermal protection circuitry.

Feature	Description
Power Output	1000 watts max power, 4-ohm stable
MOSFET Power Supply	Efficient and reliable power delivery
Low-Pass Filter	Variable 50-200Hz frequency range
Bass Boost	0-18dB boost at 45Hz
Speaker Level Inputs	For direct connection to factory head units
Preamp Outputs	For daisy-chaining multiple amplifiers
Thermal Protection	Automatic shutdown when overheating
Overload Protection	Protects against electrical overloads
Short Circuit Protection	Prevents damage from wiring shorts
Power Terminal	For +12V power connection

Installation

Unpack and inspect contents. Choose suitable mounting location.

Disconnect negative battery terminal before installation.
Mount amplifier securely using provided hardware.
Connect power wire: Run 4-gauge power cable from battery to amplifier.
Connect ground wire: Use short, thick wire to clean metal chassis.
Connect remote turn-on wire to head unit remote output.
Connect speaker wires to amplifier outputs.
Connect audio inputs (RCA or speaker level).

WARNING! Ensure proper fuse rating and secure all connections to prevent electrical hazards.

First-Time Setup

Reconnect battery and power on system; adjust settings gradually.

Set gain control: Start at minimum, increase until distortion is heard, then back off slightly.
Adjust low-pass filter: Set according to speaker capabilities (typically 80Hz for subwoofers).
Set bass boost: Use sparingly to avoid distortion.
Check phase: Ensure all speakers are in phase for optimal sound.
Test operation: Play music at various volume levels to verify proper function.

CAUTION! Always set gains with engine running to ensure adequate voltage supply.

Specifications

Max Power: 1000 watts
RMS Power: 500 watts x 1 at 4 ohms
Frequency Response: 10Hz - 250Hz
Signal-to-Noise Ratio: >95dB
Low-Pass Filter: 50-200Hz variable
Bass Boost: 0-18dB at 45Hz
Input Sensitivity: 0.2-5V
Operating Voltage: 14.4V DC (11-16V range)
Fuse Rating: 40A x 2
Dimensions: 10.5" x 9.5" x 2.25"

Controls and Settings

Access controls via front panel knobs and switches.

Front Panel: Power indicator LED, Gain control, Low-pass filter frequency, Bass boost level, Phase switch (0°/180°).

Gain: Adjusts input sensitivity to match head unit output. Low-pass Filter: Controls frequency cutoff for subwoofer output. Bass Boost: Increases low-frequency output at 45Hz. Phase: Aligns speaker phase with main system. Input Selector: Chooses between RCA and speaker level inputs.

Connecting Devices

Power: 4-gauge power and ground cables. Audio: RCA inputs or speaker level inputs. Speakers: 4-ohm subwoofer(s).

Disconnect battery before making connections.
Use proper gauge wiring for power and ground.
Route audio cables away from power wires to avoid noise.
Ensure secure connections at all terminals.
Connect remote turn-on to head unit blue wire.

Tip: Use crimp connectors and heat shrink for professional, reliable connections.

Operation Guide

Designed for subwoofer amplification in car audio systems.

Power on: System turns on automatically with head unit.
Adjust volume: Use head unit volume control primarily.
Fine-tune bass: Use amplifier controls for optimal subwoofer performance.
Monitor temperature: Ensure adequate ventilation during extended use.
Power off: System turns off with head unit or vehicle ignition.

WARNING! Do not operate with cover removed. Keep away from moisture and extreme temperatures.

Protection Features

Thermal Protection: Automatically shuts down if temperature exceeds safe limits. Overload Protection: Guards against electrical overload conditions. Short Circuit Protection: Prevents damage from output shorts. DC Offset Protection: Detects and shuts down for DC offset issues.

Care & Maintenance

Keep amplifier clean and dry. Ensure proper ventilation. Check connections periodically for corrosion or looseness.

CAUTION! Do not use chemical cleaners. Disconnect power before cleaning. Store in dry environment when not in use.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits. CE certified for European markets. Copyright © 2025 Kenwood Corporation; all rights reserved. For technical support, visit www.kenwood.com or contact 1-800-536-9663.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Wiring/fuse	Check power and ground connections; verify fuse integrity; ensure remote wire connected.
Protection mode	Overheating/short	Allow amplifier to cool; check speaker wiring for shorts; verify impedance load.
No sound	Input/connections	Verify audio input connections; check head unit settings; ensure gain is adjusted properly.
Distorted sound	Gain/clipping	Reduce gain setting; check input signal level; verify power supply voltage.
Overheating	Ventilation/impedance	Improve ventilation; check speaker impedance; reduce bass boost settings.

Reset: Disconnect power for 30 seconds to reset protection circuitry.

Service: 1-800-536-9663; www.kenwood.com