1. Introduction
Thank you for purchasing the Kicker KX400.1 Mono Subwoofer Amplifier. This amplifier is designed to deliver powerful and clear bass performance for your vehicle's audio system. Featuring Class-D efficiency, Kicker's FIT (Fail-Safe Integration Technology), built-in crossovers, and adjustable KickEQ , the KX400.1 provides robust power in a compact footprint. Please read this manual thoroughly to ensure proper installation, operation, and maintenance of your amplifier.
Image 1.1: Top view of the Kicker KX400.1 Mono Subwoofer Amplifier, showcasing its sleek silver and black design with the Kicker logo and KX 400.1 model designation.
2. Safety Instructions
Always observe the following safety precautions when installing and operating your amplifier:
- Disconnect Battery: Before beginning any installation, always disconnect the vehicle's negative battery terminal to prevent electrical shorts.
- Professional Installation: If you are unsure about the installation process, it is highly recommended to seek professional installation from an authorized Kicker dealer.
- Proper Wiring: Ensure all wiring is correctly connected, using appropriate gauge wires for power, ground, and speakers. Incorrect wiring can cause damage to the amplifier, vehicle, or personal injury.
- Ventilation: Mount the amplifier in a location that allows for adequate air circulation. Do not cover the amplifier or mount it in an enclosed space without proper ventilation, as this can lead to overheating.
- Avoid Moisture: Do not expose the amplifier to moisture, water, or excessive humidity.
- Fuse Protection: Always use the correct fuse rating as specified in the wiring instructions to protect the amplifier and your vehicle's electrical system.
- Volume Levels: Prolonged exposure to high volume levels can cause hearing damage. Adjust the volume to a safe and comfortable level.
3. Package Contents
Please check the contents of your amplifier package. If any items are missing or damaged, contact your authorized Kicker dealer immediately.
- Kicker KX400.1 Mono Subwoofer Amplifier
- Mounting Hardware (screws)
- Owner's Manual
4. Setup and Installation
4.1 Mounting
Choose a mounting location that provides adequate ventilation for the amplifier. The amplifier should be securely fastened to a solid surface to prevent movement during vehicle operation. Avoid mounting the amplifier directly on carpet or in areas prone to excessive heat or moisture.
4.2 Wiring Connections
Refer to the diagram below for proper wiring connections. Ensure all connections are secure and insulated to prevent short circuits.
Image 4.1: Rear view of the Kicker KX400.1 Mono Subwoofer Amplifier, detailing the power, ground, remote, input, output, and speaker terminals.
- Power (BATT +12V): Connect to the positive terminal of your vehicle's battery using an appropriate gauge power wire. An inline fuse (not included) must be installed within 18 inches (45 cm) of the battery.
- Ground (GND): Connect to a clean, solid metal point on the vehicle's chassis. Ensure the connection point is free of paint or rust.
- Remote (REM): Connect to the remote turn-on lead from your head unit. This signal turns the amplifier on and off with your audio system.
- Input (RCA): Connect your head unit's RCA outputs to the amplifier's RCA inputs. The amplifier also supports high-level input via the same RCA jacks using Kicker's FIT technology.
- Speaker Output: Connect your subwoofer(s) to the amplifier's speaker terminals. Observe correct polarity (+ to + and - to -). The KX400.1 is a mono amplifier, designed for a single subwoofer or multiple subwoofers wired to a compatible impedance.
- Remote Bass: This port is for an optional wired remote bass control (sold separately) to adjust bass levels from the driver's seat.
4.3 Controls Overview
The Kicker KX400.1 features several controls for fine-tuning your audio system. These controls are located on the front panel of the amplifier.
Image 4.2: Front view of the Kicker KX400.1 Mono Subwoofer Amplifier, highlighting the various adjustment knobs and indicators for optimal sound tuning.
- GAIN: Adjusts the input sensitivity of the amplifier to match the output of your head unit.
- SUB-SONIC: A high-pass filter that removes ultra-low frequencies below the audible range, protecting your subwoofer from over-excursion.
- LO-PASS X-OVER: A low-pass filter that allows only frequencies below the set point to pass through to the subwoofer. Adjustable from 40 Hz to 160 Hz.
- KICK EQ+: Kicker's variable bass boost with adjustable center frequency and bandwidth.
- CENTER FREQ: Selects the frequency point for the bass boost.
- BANDWIDTH: Adjusts the Q-factor or width of the boost around the center frequency.
- BOOST: Controls the amount of bass boost (0 dB to +18 dB).
- PRT (Protection) Indicator: Illuminates when the amplifier is in protection mode due to overheating, low voltage, or short circuit.
5. Operating and Tuning
5.1 Initial Setup and Gain Matching
- Turn the amplifier gain all the way down (counter-clockwise).
- On your head unit, turn the volume up to about 75% of its maximum level.
- Slowly increase the gain on the amplifier until you hear slight distortion, then back it off slightly until the sound is clear.
- For optimal performance, it is recommended to use a test tone and an oscilloscope for precise gain matching.
5.2 Crossover and Subsonic Filter Adjustment
- LO-PASS X-OVER: Adjust this filter to match the frequency response of your subwoofer and the rest of your audio system. A common starting point is 80 Hz.
- SUB-SONIC: Set the subsonic filter slightly below the tuning frequency of your ported subwoofer enclosure (if applicable) or around 25-30 Hz for sealed enclosures to protect the subwoofer from damaging ultra-low frequencies.
5.3 KickEQ+ Tuning
The KickEQ+ allows you to boost specific bass frequencies. Use it sparingly to enhance bass without introducing distortion.
- BOOST: Start with 0 dB boost and increase gradually.
- CENTER FREQ: Experiment with different frequencies to find the one that best enhances your subwoofer's output in your vehicle.
- BANDWIDTH: Adjust the width of the boost. A narrower bandwidth (higher Q) will affect a smaller range of frequencies, while a wider bandwidth (lower Q) will affect a broader range.
6. Maintenance
The Kicker KX400.1 amplifier requires minimal maintenance. Follow these guidelines to ensure its longevity:
- Cleaning: Periodically wipe the amplifier's exterior with a soft, dry cloth. Do not use harsh chemicals or abrasive cleaners.
- Connections: Occasionally check all wiring connections (power, ground, remote, and speaker) to ensure they are secure and free from corrosion. Loose connections can lead to poor performance or damage.
- Ventilation: Ensure that the amplifier's cooling fins are free from dust and debris to maintain proper airflow and prevent overheating.
7. Troubleshooting
If you experience issues with your Kicker KX400.1 amplifier, refer to the table below for common problems and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| No power / Amplifier not turning on | Blown fuse Loose power or ground connection No remote turn-on signal | Check and replace fuse Secure all power and ground connections Verify remote wire connection and head unit output |
| No sound output | Loose RCA or speaker connections Gain set too low Head unit issue | Check all input and output connections Increase gain setting Verify head unit is functioning correctly |
| Distorted sound | Gain set too high Improper crossover settings Speaker impedance mismatch | Reduce gain setting Adjust LO-PASS X-OVER and SUB-SONIC filters Verify subwoofer impedance is compatible with amplifier |
| Amplifier overheating (PRT light on) | Insufficient ventilation Speaker impedance too low Playing at excessive volume for prolonged periods | Ensure proper airflow around amplifier Check speaker wiring and impedance Reduce volume or allow amplifier to cool down |
8. Specifications
The following are the technical specifications for the Kicker KX400.1 Mono Subwoofer Amplifier:
| Feature | Specification |
|---|---|
| Model | KX400.1 |
| Brand | KICKER |
| RMS Power (4 Ohms) | 200 watts x 1 channel |
| RMS Power (2 Ohms) | 400 watts x 1 channel |
| Max Power Output | 800 watts x 1 channel |
| Amplifier Class | Class-D |
| Low-Pass Crossover | Adjustable (40 Hz - 160 Hz) |
| Subsonic Filter | Adjustable |
| KickEQ+ Bass Boost | 0 dB to +18 dB, adjustable center frequency and bandwidth |
| Dimensions (L x W x H) | 35.56 x 30.48 x 12.7 cm (approx.) |
| Weight | 2 kg (approx.) |
| Item Model Number | KX400.1 |
| ASIN | B00BUVRO6Q |
9. Warranty and Support
Kicker products are engineered for performance and reliability. This amplifier is covered by a limited warranty against defects in material and workmanship under normal use. The specific terms and duration of the warranty may vary by region and purchase location. Please retain your proof of purchase for warranty claims.
For detailed warranty information, technical support, or service inquiries, please contact your authorized Kicker dealer or visit the official Kicker website. Do not attempt to repair the amplifier yourself, as this may void your warranty.
Kicker Official Website: www.kicker.com
