Kenwood KAC 7205 Manual

The Kenwood KAC 7205 is a high-performance 2-channel car amplifier designed to deliver exceptional audio quality. With MOSFET power supply, variable low-pass filter, bass boost, and speaker-level inputs, this amplifier provides versatile installation options and powerful sound reproduction. 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, speaker-level inputs, variable low-pass filter, bass boost, thermal/overload/short circuit protection.

Feature	Description
MOSFET power supply	Efficient and reliable power delivery
Speaker-level inputs	Direct connection to factory head units
Variable low-pass filter	Adjustable crossover for bass management
Bass boost	Enhance low-frequency response
Protection circuitry	Thermal, overload, and short circuit protection
RCA inputs	Standard line-level connections
Power terminals	+12V, ground, and remote turn-on
Speaker outputs	2-channel speaker connections
Fuse protection	Internal fuse for electrical safety
Heat sink	Efficient cooling for prolonged operation

Installation

Choose proper mounting location and prepare wiring.

Select mounting location: Dry, well-ventilated area away from moisture.
Prepare power wiring: Connect +12V to battery, ground to chassis, remote to head unit.
Connect audio inputs: Use RCA cables or speaker-level inputs.
Connect speaker outputs: Wire to speakers observing proper polarity.
Secure all connections and test operation.

WARNING! Disconnect battery before installation. Ensure proper fuse rating. Use adequate wire gauge for power connections.

First-Time Setup

Configure amplifier settings for optimal performance.

Set input level: Adjust gain control to match head unit output.
Configure crossover: Set low-pass filter frequency as needed.
Adjust bass boost: Fine-tune low-frequency enhancement.
Test operation: Verify proper sound output from all channels.
Finalize settings: Secure controls in desired positions.

CAUTION! Avoid setting gain too high to prevent distortion. Ensure proper ventilation around amplifier.

Specifications

Channels: 2
RMS Power: 70W x 2 at 4 ohms
Max Power: 140W x 2 at 4 ohms
THD: 0.08%
Frequency Response: 10Hz - 50kHz
Signal-to-Noise Ratio: 100dB
Crossover: Variable low-pass filter (50Hz - 200Hz)
Bass Boost: 0-12dB at 50Hz
Input Sensitivity: 200mV - 4V
Fuse Rating: 20A

Controls and Settings

Front panel controls: Gain, low-pass filter, bass boost, power/protection indicators.

Control Functions: Gain (input level adjustment), Low-pass filter (crossover frequency), Bass boost (low-frequency enhancement), Power LED (operation status), Protection LED (fault indication).

Input selection: RCA or speaker-level inputs. Crossover settings: Adjust low-pass filter for subwoofer applications. Bass enhancement: Fine-tune low-end response. Level matching: Set gain to prevent distortion and maximize performance.

Connecting Devices

Power connections: +12V, ground, remote turn-on. Audio inputs: RCA or speaker-level. Speaker outputs: 2-channel connections.

Disconnect vehicle battery before connections.
Connect power wires: +12V to battery, ground to chassis, remote to head unit.
Connect audio inputs: RCA from head unit or speaker-level from factory system.
Connect speaker outputs: Observe polarity for proper phasing.
Reconnect battery and test system.

Tip: Use proper wire gauge: 8-gauge for power, 16-gauge for speakers minimum.

Operation

Normal operation procedures and control adjustments.

Power on: Amplifier turns on with head unit via remote wire.
Adjust volume: Set head unit volume to normal listening level.
Fine-tune gain: Adjust until desired volume with minimal distortion.
Set crossover: Adjust low-pass filter for desired frequency response.
Bass adjustment: Use bass boost sparingly for low-end enhancement.
Monitor operation: Check for protection mode activation.
Power off: Amplifier turns off with head unit.

WARNING! Do not operate with cover removed. Avoid excessive gain settings causing distortion.

Protection Features

Thermal protection: Activates when amplifier overheats. Overload protection: Prevents damage from excessive current. Short circuit protection: Protects against speaker wire shorts.

Care & Maintenance

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

CAUTION! Do not use chemicals or water for cleaning. Disconnect power before maintenance.

Regulatory Information

FCC Part 15: Class B digital device compliant. CE certified for European markets. Copyright © Kenwood Corporation. All trademarks property of their respective owners. For technical support, visit www.kenwood.com or contact 1-800-536-9663.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power connections	Check +12V, ground, remote connections; verify fuse.
Protection mode	Overheating/short circuit	Allow cooling; check speaker wires for shorts.
No sound	Input connections	Verify RCA/speaker-level inputs; check head unit settings.
Distorted sound	Gain setting	Reduce gain control; check head unit output level.
Intermittent operation	Loose connections	Inspect all wiring connections; secure properly.

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

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