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See more detailsInfinity Kappa 42.5i
4" 2-way Speakers
79.99 pair
Infinity Kappa 42.5i
Our take on the Infinity Kappa 42.5i by Crutchfield's Todd Cabell
Infinity has blended a bundle of audio innovations into a smooth-sounding 4" package! The Kappa 42.5i features Ceramic Metal Matrix Diaphragm (C.M.M.D.) cones, which are constructed by sandwiching aluminum between layers of ceramic to form a lightweight, durable driver that is extremely musical.
The oversized Plus One C.M.M.D. woofer cone delivers accurate low-frequency performance with minimal distortion. A cast-polymer basket and hi-roll rubber surround help to eliminate unwanted resonances. The C.M.M.D. balanced dome tweeter reproduces high notes in rich, lifelike detail.
An outboard 2-way crossover network (computer-optimized for the 42.5i) routes signals to the appropriate drivers you'll enjoy component system sound quality from these easy-to-install coaxials.
Priced per pair
What's in the Box:
- Two 2-way speakers
- 2 Grilles
- 2 Grille rings
- 2 In-line crossovers
- 8 Self-tapping screws
- 8 Speed clips
- Instructions
- Warranty/registration card
Product Highlights:
- Ceramic Metal Matrix Diaphragm (C.M.M.D.) woofer cone
- 3/4" C.M.M.D. tweeter
- hi-roll rubber surround
- 2-way crossover (18 db/octave, 3,500 Hz high- and low-pass)
- frequency response 75-21,000 Hz
- recommended power range 2-50 watts RMS
- peak power handling 150 watts
- sensitivity 90 dB
- depth 1-13/16"
- 3-year warranty
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Hands-on research
Features and Specs
| General | ||
|---|---|---|
| Speaker Size | 4 | |
| Design | 2-way | |
| Tweeter Design | 3/4" Balanced-dome | |
| Tweeter Composition | C.M.M.D. | |
| Woofer Composition | C.M.M.D. | |
| Woofer Surround | Hi-roll rubber | |
| Parts Warranty | 3 Years | |
| Labor Warranty | 3 Years | |
| Specifications | ||
| Sensitivity (1W at 1 meter) | N/A | |
| Sensitivity at 2.83 volts | 90 | |
| Frequency Response | 75 - 21k Hz | |
| Minimum RMS Wattage | 2 | |
| Maximum RMS Wattage | 50 | |
| Peak Power Handling (Watts) | 150 | |
| Impedance (Ohms) | 4 | |
| Top-mount Depth (Inches) | 1 13/16 | |
| Bottom-mount Depth (Inches) | 1 15/16 | |
| Cutout Diameter or Length (inches) | 3 11/16 | |
Product Research
Features
Ceramic Metal Matrix Diaphragm (C.M.M.D.): Infinity's C.M.M.D. technology delivers accurate performance with dramatically reduced distortion for incredibly lifelike sound. Additionally, the C.M.M.D. drivers can withstand extreme temperatures, moisture, humidity and sunlight.
C.M.M.D. Plus One Woofer Cones: These speakers use cones approximately 30% larger than other speakers of the same size. This is accomplished by using a new basket design and hi-roll surround. The Plus One design offers greater bass output and a significant increase in efficiency. In addition, the C.M.M.D. cones virtually eliminate coloration due to cone flexing, resulting in less distortion and superior accuracy.
Surrounds: The hi-roll rubber surrounds allow the woofers a greater range of movement, resulting in longer X-max and more bass output.
Tweeters: Each speaker has a 3/4" C.M.M.D. balanced-dome tweeter, which offers superior stiffness and damping compared to traditional metal domes.
2-Way Crossovers: These speakers include computer-optimized, voice-matched crossovers. Each crossover features an 18dB/octave, 3.5kHz high-pass network for the tweeter and an 18dB/octave, 3.5kHz low-pass network for the woofer.
Crossover Connections: Each crossover has an 11" input lead terminated with bare wire and two 18" output leads, one for the woofer and one for the tweeter, terminated with female quick-slides. The positive woofer lead has a 0.205" female quick-slide and the negative woofer lead has a 0.110" female quick-slide. The positive tweeter lead has a 0.250" female quick-slide and the negative tweeter lead has a 0.187" female quick-slide. These quick-slides connect directly to the woofer and tweeter terminals on each speaker.
Crossover Dimensions: L=3.458", W=1.734", H=1.087"
Our Product Research Team
At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

