Why Choose Crutchfield?
Great gear and expert advice
Our experts help you pick the ideal gear for your needs.Meet our advisors
Free tech support for the life of your gear.Read about our one-on-one expert help
You may return items that are complete and like new for any reason within 60 days.See the details of our return policy
Earn one point for every dollar you spend and use those points to save on future purchases.Get full details on Crutchfield Rewards
Deep discounts on car installation gear
We offer vehicle-specific installation instructions, dash kits, wiring harnesses, and speaker accessories at deeply discounted prices with car stereo and speaker purchases. Available for most vehicles.Learn more
Trusted since 1974
Our customers have trusted us with their business, and they’ve helped us win awards for our service.Check out our most recent awards
The manufacturer’s warranty always applies.See more details
Infinity Kappa 42.5i
4" 2-way Speakers
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
- Warranty/registration card
- 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
Features and Specs
|Tweeter Design||3/4" Balanced-dome|
|Woofer Surround||Hi-roll rubber|
|Parts Warranty||3 Years|
|Labor Warranty||3 Years|
|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|
|Top-mount Depth (Inches)||1 13/16|
|Bottom-mount Depth (Inches)||1 15/16|
|Cutout Diameter or Length (inches)||3 11/16|
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.