Kenwood KAC 622 Manual

The Kenwood KAC 622 is a 2-channel car amplifier designed for automotive audio systems, featuring 75W RMS per channel at 4 ohms, high and low level inputs, variable low-pass filter, bass boost, and speaker-level input capability. 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: 2-channel amplifier, speaker terminals, RCA inputs, gain controls, bass boost, low-pass filter.

Feature	Description
Power Output	75W RMS x 2 channels at 4 ohms
Input Sensitivity	200mV - 4V (adjustable)
Low-Pass Filter	50Hz - 200Hz (variable)
Bass Boost	0 to +12dB at 50Hz
Speaker Level Input	Accepts high-level speaker inputs
RCA Inputs	For line-level audio connection
Power Terminal	+12V DC power input
Ground Terminal	Chassis ground connection
Remote Turn-on	Remote amplifier activation
Fuse	20A built-in protection

Installation

Choose proper mounting location and ensure secure connections.

Mount amplifier: Select dry, well-ventilated location away from heat sources.
Connect power: Run +12V wire from battery with inline fuse; connect ground to chassis.
Connect remote wire: Connect to head unit remote turn-on output.
Connect audio inputs: Use RCA cables from head unit or speaker-level inputs.
Connect speakers: Ensure proper polarity and impedance matching.

WARNING! Disconnect battery before installation. Ensure all connections are secure and insulated.

First-Time Setup

Power on system; adjust settings for optimal performance.

Set gain control: Start at minimum, gradually increase while playing music.
Adjust low-pass filter: Set according to speaker capabilities (typically 80-100Hz).
Set bass boost: Use sparingly to avoid distortion.
Check operation: Verify all channels working properly.
Fine-tune settings: Make final adjustments while listening to various music types.

CAUTION! Avoid setting gains too high to prevent speaker damage and distortion.

Specifications

RMS Power: 75W x 2 at 4 ohms, 150W x 2 at 2 ohms
Peak Power: 300W maximum
Frequency Response: 10Hz - 50kHz
Signal-to-Noise Ratio: >95dB
Total Harmonic Distortion: <0.08%
Input Sensitivity: 200mV - 4V (adjustable)
Crossover: Low-pass 50-200Hz (12dB/octave)
Bass Boost: 0 to +12dB at 50Hz
Fuse Rating: 20A
Operating Voltage: 14.4V DC (11-16V range)

Controls and Settings

Access controls via front panel knobs and switches.

Front Panel: Power indicator, Gain control, Low-pass filter, Bass boost.

Gain Control: Adjusts input sensitivity (200mV - 4V). Low-Pass Filter: Sets cutoff frequency (50-200Hz). Bass Boost: Increases bass level at 50Hz (0 to +12dB). Input Selector: Choose between RCA or speaker-level inputs. Power LED: Indicates amplifier status (green = on, red = protection).

Connecting Devices

Power: +12V battery, ground, remote. Audio: RCA inputs or speaker-level. Output: Speaker terminals.

Turn off vehicle and disconnect battery before connections.
Connect power wires: +12V (red), ground (black), remote (blue).
Connect audio inputs: RCA cables from head unit or speaker wires.
Connect speaker outputs: Ensure proper polarity (+/-).
Reconnect battery and test system.

Tip: Use proper gauge wire for power connections (8-10 AWG recommended).

Operation Guide

Supports various audio sources and speaker configurations.

Power on: System activates when head unit is turned on.
Adjust volume: Use head unit volume control as primary.
Fine-tune amplifier: Use gain control to match head unit output.
Set crossover: Adjust low-pass filter for optimal frequency response.
Bass adjustment: Use bass boost sparingly for desired low-end enhancement.
Monitor performance: Listen for distortion and adjust settings accordingly.
Power off: System turns off with head unit or vehicle ignition.

WARNING! Do not operate at maximum volume for extended periods to avoid overheating.

Protection Features

Thermal Protection: Automatically shuts down if temperature exceeds safe limits. Short Circuit Protection: Protects against speaker wire shorts. Overload Protection: Prevents damage from excessive input signals. DC Offset Protection: Safeguards speakers from DC voltage.

Care & Maintenance

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

CAUTION! Do not expose to moisture or extreme temperatures. Keep ventilation areas clear.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits. 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/fuse	Check +12V, ground, remote wires; verify fuse intact.
Protection mode	Short circuit/overheating	Check speaker wires for shorts; allow amplifier to cool.
No sound	Input connections/settings	Verify RCA/speaker inputs; check gain setting; ensure head unit on.
Distorted sound	Gain too high/clipping	Reduce gain control; check head unit volume level.
Overheating	Insufficient ventilation/overload	Improve airflow; reduce volume; check impedance load.

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

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