Kenwood KAC 9105D Manual

The Kenwood KAC 9105D is a high-performance 2-channel car amplifier delivering 1000W max power with MOSFET power supply, variable low-pass filter, bass boost, and speaker-level inputs. Features include Class D design, thermal/overload/short circuit protection, and compatibility with various audio sources. 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 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/high-level inputs, protection circuitry.

Feature	Description
Power Output	1000W max power (500W x 2)
MOSFET Power Supply	Efficient power conversion
Low-Pass Filter	Variable 50-200Hz
Bass Boost	0-12dB boost at 40Hz
Input Sensitivity	200mV-4V (RCA), 0.5V-8V (high-level)
Speaker Terminals	Spring-loaded connectors
Protection Circuit	Thermal/overload/short circuit
Class D Design	High efficiency operation
LED Power Indicator	Blue illumination when powered
Remote Turn-on	Remote turn-on capability

Installation

Choose proper location and ensure secure mounting.

Select mounting location: Well-ventilated area, away from moisture.
Connect power: 12V battery connection with fuse, ground connection.
Connect speakers: Use appropriate gauge speaker wire.
Connect audio inputs: RCA or high-level inputs from head unit.
Connect remote turn-on: To head unit remote wire.

WARNING! Disconnect battery before installation. Ensure proper fuse rating. Avoid pinching wires during installation.

First-Time Setup

Power on amplifier; adjust settings for optimal performance.

Set input sensitivity: Start at minimum, adjust while playing music.
Set low-pass filter: Adjust based on speaker capabilities (typically 80Hz).
Set bass boost: Start at minimum, adjust to preference.
Check connections: Ensure all wires secure and properly connected.
Test operation: Play audio at various volume levels.

CAUTION! Do not operate without proper load. Avoid short circuits. Keep ventilation clear.

Specifications

RMS Power: 500W x 2 at 2 ohms
Max Power: 1000W
THD: 0.08%
Frequency Response: 10Hz-240Hz (+0, -1dB)
Signal-to-Noise: 95dB
Input Sensitivity: 200mV-4V (RCA), 0.5V-8V (high-level)
Low-Pass Filter: 50-200Hz, 12dB/octave
Bass Boost: 0-12dB at 40Hz
Dimensions: 10-1/16" x 8-1/16" x 2-3/16"
Operating Voltage: 14.4V DC (11-16V allowable)

Controls and Settings

Access controls via front panel knobs and switches.

Front Panel: POWER indicator (blue LED), INPUT SENSITIVITY, LOW-PASS FILTER, BASS BOOST.

Input Sensitivity: Adjusts amplifier gain (200mV-4V). Low-Pass Filter: Controls frequency cutoff (50-200Hz). Bass Boost: Enhances low frequencies (0-12dB at 40Hz). Input Selector: Choose between RCA and high-level inputs. Protection LED: Indicates thermal/overload conditions.

Connecting Devices

Power: 12V battery, ground, remote turn-on. Audio: RCA or high-level inputs. Speakers: 2-8 ohm speakers.

Disconnect battery negative terminal before connections.
Connect power wires: 12V (red), ground (black), remote (blue).
Connect audio inputs: RCA cables from head unit or speaker wires.
Connect speakers: Positive and negative terminals to speakers.
Reconnect battery and test system.

Tip: Use proper gauge wire for power and speaker connections. Keep signal wires away from power wires.

Operation

Designed for continuous operation with proper ventilation.

Power on: Remote turn-on from head unit activates amplifier.
Adjust settings: Set input sensitivity, filter, and bass boost as needed.
Monitor performance: Blue LED indicates normal operation.
Protection modes: Amplifier will shut down if overloaded or overheated.
Power off: Turns off with head unit via remote wire.

WARNING! Do not operate without proper ventilation. Avoid clipping by setting proper gain levels. Do not bridge channels unless specified.

Protection Features

Thermal Protection: Shuts down if temperature exceeds safe limits. Overload Protection: Protects against excessive current draw. Short Circuit Protection: Prevents damage from speaker wire shorts. DC Offset Protection: Monitors output for DC voltage.

Care & Maintenance

Keep amplifier clean and dry. Ensure proper ventilation. Check connections periodically.

CAUTION! Do not use liquids for cleaning. Keep away from moisture. Check fuse rating before replacement.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for vehicle use. Copyright © Kenwood Corporation; all rights reserved. For support, visit www.kenwood.com or contact authorized Kenwood service centers.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power connections/fuse	Check 12V, ground, remote wires; inspect fuse.
Protection mode active	Overload/short circuit	Check speaker connections; allow cooling if thermal.
No sound	Input connections/settings	Verify RCA/speaker inputs; check input sensitivity.
Distorted sound	Gain setting/clipping	Reduce input sensitivity; check source volume.
Amplifier overheats	Insufficient ventilation	Improve airflow; check impedance load.

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

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