Introduction
Thank you for choosing KICKER KM4 Marine Coaxial Speakers. These speakers are engineered for high-performance audio in marine environments, offering durability and clear sound reproduction. This manual provides essential information for the proper installation, operation, and maintenance of your speakers to ensure long-lasting enjoyment.
Key Features
- Power Range: 2-50 watts RMS (150 watts peak power)
- Frequency Response: 60-20,000 Hz
- Sensitivity: 89 dB
- Impedance: 2 ohms
- Waterproof Design: Built with marine-grade materials for resistance against water and harsh outdoor conditions.
- Material: Constructed from durable Polymer and Polypropylene.
- Included Grilles: Comes with both charcoal and white grilles to match your vessel's aesthetic.
Setup and Installation
Proper installation is crucial for optimal performance and longevity of your KICKER KM4 speakers. It is recommended to have installation performed by a qualified marine audio technician.
Unpacking and Inspection
Carefully unpack the speakers and inspect them for any signs of damage. Ensure all components, including the speakers and both sets of grilles (charcoal and white), are present.

Image: KICKER KM4 4-inch marine coaxial speaker with charcoal grille.

Image: KICKER KM4 speakers showing both charcoal and white grille options.
Mounting Location
Choose a mounting location that provides adequate space for the speaker's depth and allows for proper sound dispersion. Ensure the surface is flat and sturdy enough to support the speakers. The speakers are designed for boat mount applications.
Wiring
Connect the speaker wires to your marine audio system. Pay close attention to polarity (+/-) to ensure correct phase and optimal sound quality. The speakers have a 2-ohm impedance, which should be compatible with your amplifier's specifications.
Dimensions
Refer to the diagram below for precise speaker dimensions to assist with mounting and cutout requirements.

Image: Dimensional drawing of the KICKER KM4 speaker, indicating a 4-inch diameter and 1.88-inch mounting depth.
Operating Instructions
Once installed, operate your KICKER KM4 speakers through your marine audio head unit or amplifier. Adjust volume, balance, and tone controls as desired. These speakers are designed for music playback and are compatible with various marine audio systems.
- Ensure your audio system is powered on before playing music.
- Start with a low volume and gradually increase it to your preferred listening level.
- Avoid prolonged listening at excessively high volumes to prevent speaker damage and hearing loss.
Maintenance
To maintain the performance and appearance of your KICKER KM4 marine speakers, follow these guidelines:
- Cleaning: Regularly wipe down the grilles and speaker cones with a soft, damp cloth. Avoid using harsh chemicals or abrasive cleaners.
- Inspection: Periodically check speaker connections for corrosion or looseness. Ensure mounting screws are secure.
- Protection: Although waterproof, prolonged exposure to direct sunlight or extreme weather conditions can affect speaker longevity. Consider using covers when the boat is not in use.
Troubleshooting
If you experience issues with your KICKER KM4 speakers, refer to the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound from speakers | Loose wiring, incorrect connections, amplifier off, source unit issue. | Check all wiring connections for tightness and correct polarity. Ensure amplifier and head unit are powered on and functioning. Verify audio source. |
| Distorted or poor sound quality | Over-driving speakers, incorrect amplifier settings, damaged speaker, poor audio source. | Reduce volume. Check amplifier gain and crossover settings. Inspect speaker cones for physical damage. Try a different audio source. |
| Intermittent sound | Loose connections, faulty wiring, overheating amplifier. | Inspect all wiring and connections. Ensure adequate ventilation for the amplifier. |
If problems persist after attempting these solutions, contact KICKER customer support or a certified marine audio technician.
Specifications
| Specification | Value |
|---|---|
| Model Name | 45KM42 |
| Speaker Type | Coaxial |
| Speaker Size | 4 Inches (100mm) |
| Woofer Diameter | 4 Inches |
| Tweeter Diameter | 0.5 Inches (13mm) |
| Impedance | 2 Ohms |
| Power Range (RMS) | 2-50 Watts |
| Peak Power | 150 Watts |
| Frequency Response | 60-20,000 Hz |
| Sensitivity | 89 dB |
| Mounting Type | Boat Mount |
| Material | Polymer, Polypropylene |
| Special Feature | Waterproof |
| Product Dimensions (D x W x H) | 4.88"D x 8.25"W x 14.38"H |
| Item Weight | 3 Pounds |
| Included Components | 45KM42 Speakers, Charcoal and White Grilles |
Warranty and Support
The KICKER KM4 Marine Coaxial Speakers come with a Limited Warranty. For specific warranty terms, conditions, and duration, please refer to the warranty card included with your product or visit the official KICKER website. For technical support, replacement parts, or service inquiries, please contact KICKER customer service directly.
KICKER Customer Support: For assistance, please visit www.kicker.com or refer to the contact information provided in your product packaging.





