1-Inch PEI Balanced-Dome Tweeter for Detailed Highs
The KFC-1366S uses a 1-inch PEI balanced-dome tweeter to reproduce higher-frequency musical information.
PEI, or polyetherimide, is a lightweight material commonly used in automotive tweeter construction.
The integrated tweeter helps reproduce details such as cymbals, vocal harmonics, string instruments, and percussion.
Because the tweeter is mounted within the speaker assembly, no separate tweeter installation is required.
This makes the KFC-1366S especially convenient for drivers replacing factory coaxial speakers.
Kenwood Sound Field Enhancer Technology
One of the KFC-1366S’s standout features is Kenwood Sound Field Enhancer.
This specialized tweeter design is intended to improve high-frequency dispersion and reduce interference around the tweeter assembly.
In many vehicles, door speakers are mounted low in the cabin and do not point directly toward the listener.
Sound Field Enhancer helps distribute high-frequency sound across a wider listening area, supporting a more enjoyable listening experience.
For drivers seeking clearer vocals and more detailed music without installing a separate component speaker system, this is a useful feature.
Enlarged Magnet Circuit for Controlled Sound Reproduction
Kenwood equips the KFC-1366S with an enlarged magnet circuit designed to support clear sound reproduction.
The magnet assembly works with the speaker’s voice coil to control cone movement.
Consistent cone movement is important for reproducing music accurately and limiting unwanted distortion.
The speaker also uses a durable steel basket to support the driver assembly.
Together, these components provide a practical foundation for everyday automotive listening.
260W Peak and 30W RMS Power Handling
Kenwood rates the KFC-1366S at 260 watts maximum input power and 30 watts RMS per speaker.
These figures serve different purposes:
- 260W peak: Maximum short-duration input power rating.
- 30W RMS: Rated continuous input power handling.
- 4-ohm impedance: Nominal electrical load for amplifier compatibility.
When selecting an amplifier, the 30W RMS rating is more useful than the peak-power figure.
The KFC-1366S can be a suitable choice for many modest-power factory and aftermarket audio systems, provided the electrical specifications match.
Avoid excessive bass boost, amplifier clipping, or gain settings that introduce distortion.
For additional installation guidance, read our car amplifier setup guide.
89 dB Sensitivity and 45Hz–22kHz Frequency Response
The Kenwood KFC-1366S features an 89 dB sensitivity rating and a manufacturer-listed frequency response of 45Hz–22,000Hz.
Sensitivity describes speaker output under specified test conditions and is useful when comparing speakers for modest-power audio systems.
The frequency-response range indicates the spectrum of sound the speaker is designed to reproduce.
Actual output varies with speaker mounting, amplifier power, vehicle acoustics, and crossover settings.
For drivers looking to restore everyday sound quality without installing a powerful external amplifier, these specifications make the KFC-1366S a practical option.
Compact Mounting Depth for Easier Factory Replacement
The Kenwood KFC-1366S has a mounting depth of just 1-3/4 inches, making it a useful candidate for compatible factory speaker locations with limited clearance.
The speaker also features a low-profile tweeter arrangement, helping reduce interference with certain factory grilles.
Before purchasing, verify:
- Factory speaker diameter and opening
- Available mounting depth
- Mounting screw-hole locations
- Factory grille clearance
- Original speaker impedance
- Wiring connector compatibility
- Any required speaker adapter brackets
Some vehicles require installation adapters or wiring harnesses.
The 5.25-inch speaker designation does not guarantee universal vehicle fitment.
For more information, explore our best car speakers upgrade guide.
Kenwood KFC-1366S Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | Kenwood |
| Series | Sport Series |
| Model | KFC-1366S |
| Speaker size | 5.25 inches |
| Configuration | 2-way coaxial |
| Maximum input power | 260 watts |
| RMS input power | 30 watts |
| Nominal impedance | 4 ohms |
| Sensitivity | 89 dB |
| Frequency response | 45Hz–22kHz |
| Woofer cone | Polypropylene |
| Woofer surround | Cloth |
| Tweeter | 1-inch PEI balanced dome |
| Sound technology | Sound Field Enhancer |
| Magnet design | Enlarged ferrite magnet circuit |
| Mounting depth | 1-3/4 inches |
| Cutout diameter | 4-7/16 inches |
| Speaker grilles | Included |
| Package configuration | Pair |
Frequently Asked Questions
Are Kenwood KFC-1366S speakers 2-way?
Yes. They use a 2-way coaxial configuration with a polypropylene woofer and integrated PEI balanced-dome tweeter.
How much power can the KFC-1366S handle?
Kenwood rates each speaker at 260 watts peak and 30 watts RMS.
Are these speakers 500 watts?
No. The official manufacturer rating is 260W peak per speaker, not 500W. Do not advertise the pair as a 500W system.
Will these speakers work with a factory stereo?
They can work with many compatible factory stereos, but the original speaker impedance and amplifier configuration should be verified.
Do these speakers need a separate amplifier?
Not necessarily. Many compatible factory or aftermarket head units can power them for everyday listening.
Are the KFC-1366S speakers good for bass?
They can reproduce useful midbass, but a dedicated subwoofer is recommended for substantial deep-bass output.
Do these speakers include grilles?
Yes. Kenwood lists two speaker grilles in the standard package.
Will they fit my vehicle?
Fitment depends on the factory opening, mounting depth, wiring, and available clearance. Vehicle-specific adapters may be necessary.
Why Choose Kenwood KFC-1366S Speakers?
The Kenwood KFC-1366S 5.25-inch 2-way coaxial speakers offer a practical combination of clear sound, compact construction, and straightforward installation.
With polypropylene woofers, 1-inch PEI balanced-dome tweeters, Sound Field Enhancer technology, and 30W RMS power handling, these speakers are designed for drivers seeking a dependable factory audio upgrade.
Upgrade your vehicle’s audio with Kenwood KFC-1366S Sport Series speakers and enjoy clearer vocals, detailed highs, and more engaging music on every drive.
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