Garage
Shop

See all parts that fit your 2019 Flex

Infinity Kappa 42.5i 4"

Infinity
Shop all Infinity
Product videos
highlight-star-icon

Kappa Series 42.5i 4" 2-way Speakers C.M.M.D. woofer and balanced dome tweeter • hi-roll rubber surround • 2-50W RMS power range

Learn more about the 425i

Good news and a little bad...

This item has been discontinued

But you may be interested in the newest model that's available.

427i thumbnail

Infinity Kappa 42.7i

OUR PRICE: $69.99

View item
NVX - Worth the Envy - Direct to Consumer Car Audio

Loading...
72-5601 main

Metra 72-5601

Install New Speakers in select 1998-2024 vehicles from Ford, Lincoln, Mercury

7
-10.01%

$8.99

List price $9.99

SA68 main

Scosche SA68

Add 5-1/4" or 6-1/2" Speakers to Factory 6" x 8" Mounting Locations for select 1950-2025 vehicles from Ford, Mercury, Mazda

39
-46.70%

$7.99

List price $14.99

P1683 main

Rockford Fosgate Punch P1 P1683

260W Peak (130W RMS) 6x8" Punch Series 3 Way Coaxial 4-ohm Speakers

85
FRING68 main

NVX FRING68

Universal 6x8" or 5x7" Self-Adhesive Foam Speaker Baffle Ring Kit (Pack of 2)

12
-46.68%

$15.99

List price $29.99

51KSC3504 main

Kicker KSC35 (51KSC3504)

200W Peak (100W RMS) 3.5" KS Series 2 Way Coaxial 4-ohm Speakers

4
-11.11%

$79.99

List price $89.99

51KSS6804 main

Kicker KSS68 (51KSS6804)

500W Peak (250 RMS) 6x8" KS-Series 2-way 4-ohm Component Speaker System (KSS6804)

-10.71%

$249.99

List price $279.99

R1T-S main

Rockford Fosgate PRIME R1T-S

160W Peak (80W RMS) 1" PRIME Series Mylar Balanced Dome Car Tweeters

34

JBL SHOCK WAVE 150W65 (JBLSPKSW150W65)

600W Peak (300W RMS) 6.5" Shock Wave Series 4-ohm Midrange Speakers

5
-7.70%

$119.95

List price $129.95

Product Highlights


Kappa Series 42.5i 4" 2-way Speakers C.M.M.D. woofer and balanced dome tweeter • hi-roll rubber surround • 2-50W RMS power range

Description


Infinity brand icon

Authorized dealer

  • 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"
  • 1-year SonicElectronix.com warranty

Product history:

Infinity 42.7i thumbnail
(newest, current model)
Infinity 42.5I thumbnail
(previous model, replaced by Infinity Kappa 42.7i)

Loading...
REF507CF_2_MET-825601_2 main

2 Infinity REF507CF (INFSPKRF507CFUS) w/ Adapter Plates

390W Peak (130W RMS) 5.25" Reference Series 2-way 3-ohm Component Speaker System with Speaker Adapter Plates

3
-12.14%

$477.88

List price $543.88

Limited time!
46CSC654 main

Kicker CSC65 (46CSC654)

600W Peak (200W RMS) 6.5” CS Series 2 Way Coaxial 4-ohm Speakers

124
-33.36%

$79.96

List price $119.99

DMH-1800NEX main

Pioneer DMH-1800NEX

6.8" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto, and SiriusXM Ready

3
-19.05%

$339.99

List price $420.00

UTE-73BT main

Alpine UTE-73BT

Single DIN Digital Media Receiver with Bluetooth

44
-16.69%

$149.95

List price $180.00

Limited time!
Club 622 main

JBL Club 622

360W Peak (120W RMS) 6.5" Club Series 2-way Coaxial 3-ohm Speakers

5
-28.58%

$99.95

List price $139.95

CV15BT main

Cerwin-Vega CV15BT

Single Din Digital Media Receiver with Bluetooth

3
43DSC6504 main

Kicker DSC650 (43DSC6504)

480W Peak (120W RMS) 6.5” DS Series 2-way 4-ohm Coaxial Car Speakers (DSC6504)

28
-10.53%

$84.99

List price $94.99

Limited time!
DMH-W3050NEX main

Pioneer DMH-W3050NEX

6.8" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay and Android Auto, and Built-in Alexa (Sirius XM Ready)

1
-24.20%

$469.99

List price $620.00

DB652 main

Polk Audio DB652 (DB 652)

600W Peak (200W RMS) 6.5" DB+ Series 2 Way Coaxial 4-ohm Car, Marine and Powersports Speakers

12
-9.16%

$109.00

List price $119.99

Club 322F main

JBL Club 322F (SPKCB322FAM)

150W Peak (50W RMS) 3.5" Club Series 2 Way Coaxial 3-ohm Speakers

1
-27.29%

$79.95

List price $109.95


Best selling similar products

JS40K small

Jensen JS40K

• 150 watts Peak Each, 35 watts RMS Each
• 1-3/8" PEI (Polyetherimide) Dome Midranges
• 1/2" PEI (Polyetherimide) Dome Tweeters
• Woven Aramid Fiber cone material
• Impedance: 4 ohm
• Sensitivity: 85 dB

$89.99

List price $89.99

TS-A1081F small

Pioneer TS-A1081F

• 230 watts Peak Each, 50 watts RMS Each
• 1" PEI (Polyetherimide) Hard Dome tweeters
• Carbon and Mica Reinforced Injection Molded Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 90 dB

(3)

$90.00

List price $110.00

DB402 small

Polk Audio DB402 (DB 402)

• 135 watts Peak Each, 45 watts RMS Each
• 3/4" Silk Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 90 dB

(4)

$90.00

List price $99.99

C1-400x small

JL Audio C1-400x

• 35 watts RMS Each
• 3/4" Silk-Suspended Aluminum Edge Driven Dome tweeters
• Mineral-Filled Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 84.5 dB

(8)

$94.99

List price $94.99

51KSC404 small

Kicker KSC4 (51KSC404)

• 150 watts Peak Each, 75 watts RMS Each
• 1/2" Silk Balanced Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 88 dB

(3)

$99.99

List price $119.99

STAGE245F small

JBL Stage2 45F (STAGE245F)

• 40 watts Peak Each, 20 watts RMS Each
• PEI (Polyetherimide) Edge Driven Dome Tweeters
• Polypropylene cone material
• Sensitivity: 89 dB

$49.99

List price $69.00

R14X2 small

Rockford Fosgate Prime R14X2

• 60 watts Peak Each, 30 watts RMS Each
• 1/2" Silk Dome tweeters
• Vacuum polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 85 dB

(14)

$64.99

List price $64.99

46CSC44 small

Kicker CSC4 (46CSC44)

• 150 watts Peak Each, 50 watts RMS Each
• 1/2" PEI (Polyetherimide) Balanced Dome Tweeters
• Polypropylene cone material
• Steel mesh speaker grilles included
• Impedance: 4 ohm
• Sensitivity: 88 dB

(1)

$59.96

List price $84.99

C2-400X small

JL Audio C2-400x

• 35 watts RMS Each
• 3/4" Silk Dome tweeters
• Mica Injected Polypropylene - MIPP cone material
• Impedance: 4 ohm
• Sensitivity: 84.5 dB

(9)

$164.99

List price $189.99

S2-S40 small

Alpine S2-S40

• 140 watts Peak Each, 45 watts RMS Each
• Hi-Res Audio Certified
• 3/4" Cloth Soft Dome tweeters
• Polypropylene, Glass Fiber and Mica cone material
• Impedance: 4 ohm
• Sensitivity: 86 dB

(2)

$109.95

List price $130.00

Item Details


Manufacturer:

Model Number:

42.5I

Weight:

6.00lbs

Internal SKU:

425i

Internal Product ID:

376

Product and How-to Videos


Customer Ratings & Reviews


Infinity Kappa 42.5i 4

5 star
67%
4 star
33%
3 star
0%
2 star
0%
1 star
0%



Durability
5
Value
4.7
Features
4.4
Design
4.4
Usability
5

Customer Reviews

Sort by:

Loading...

very good highs, zero lows

These speakers are incredibly accurate for mid-highs and highs. With a good set of mid ranges and a sub these speakers are the perfect add-on. The highs are very crisp, and the mids are very good too. Do not buy these speakers if you are looking for bass in the least. Don't buy ANY 4" speaker looking for bass.

Overall, a great speaker for highs in the front.

By John on March 24, 2006

3 found this helpful


Average speaker!

This current speaker i just purchased because my two front 4" speakers blew in my dash and i purchased these and they arent much of anything to spectacular. besides they play pretty clear but i guess you have to keep in my you cant recieve much out of a 4" speaker versus a 6 x 9 KAPPA series infinity speaker, those are nuts!

By Andy on March 22, 2005

3 found this helpful


Not Too Shabby

I got these speakers from a friend after trade for an old MTX competition subwoofer because I needed new 4's for my dash. They are a little deeper in design so fitting in my dash was a challenge, but they have incredible clarity and sound good just off of RMS power. They are definitely worth the price if you need 4" speakers.

By Jackson on December 31, 2010

1 found this helpful



10TC104 small

Kicker Comp TC10 (10TC104)

300W Peak (150W RMS) Single 10" 4 ohm Comp Series Subwoofer Loaded Truck Box

(19)

$99.95

List price $179.95

99-7313 small

Metra 99-7313 Dash Kit

Install a new Single-DIN car stereo in select 2001-2008 vehicles from Hyundai, Kia

(5)

$24.99

List price $27.99

iDA-X100 small

Alpine iDA-X100

In-Dash Digital Media Receiver with Built-In iPod Adapter and Controls

(4)

$269.99

List price $429.99

10MJSG small

Single 10" Molded JMC Box

Custom Designed Ported Enclosure

(5)

$54.99

List price $149.99

SOLOS10PORTSQ small

Kicker Single 10" Square-Ported MDF Enclosure

$39.99

List price $99.99

HD 429 small

Sennheiser HD 429 (HD429) Over-Ear Closed-Back Headphones

Over-Ear Professional Closed-Back Headphones

(29)

$44.99

List price $79.95

FILM-2-SD-SH small

ION FILM 2 SD SH

35mm-Slide Holders for FILM 2 SD

$19.99

List price $0.00

SHB7000WT/28 small

Philips SHB7000 - White

Wireless Bluetooth Headphones Stereo Headset with Built-In Microphone & Rechargeable Battery

(6)

$38.69

List price $79.99

APS45N small

Prestige APS45N

Keyless Entry System w/ Two Auxiliary Outputs

(2)

$39.99

List price $119.99

Related Searches


Save up to 10 different vehicles in your garage
Vehicle
Store
Delete

2019 Ford Flex

2003 Mitsubishi Eclipse

2012 Mazda MX-5 Miata

2012 Ram 3500

2007 Ford Taurus

2012 Toyota RAV4

2011 BMW 740i

2008 Audi A3 Quattro

2016 Subaru Forester

2006 Dodge Stratus

Add vehicle Clear all vehicles
Where to find vehicle info
Are you sure you want to clear your garage?
This action cannot be undone. Confirm
This page was not designed for products.
If you continue, you will be redirected to a category customized for your vehicle. Continue
Loading...
Identify your vehicle and submodel details
  • Owner's manual
  • Vehicle's insurance card
  • Vehicle registration
  • Vehicle produced after 2005: Inside driver's side door
  • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
Car Info Side Door Icon
Vehicle Registration Icon
Vehicle Insurance Icon

Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

  • You see only parts engineered for your exact vehicle
  • You avoid incompatible radios, speakers, or wiring
  • Installation is smoother, faster, and frustration-free
  • You get the correct accessories the first time

Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.