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Refers to the size of the speaker measured in inches. Every vehicle has standard application sizes. Please use our vehicle fitment guide for your vehicle's specific speaker sizes if you do not know them.
The number of individual drivers in a car speaker. Speakers with 2 drivers are known as a 2-way, and 3 drivers are known as a 3-way. Component systems are often referred to as "separates" because the tweeter is not attached to the midwoofer (main speaker driver) and mounts separately in a location such as a door post. Component systems typically come with an external crossover so you can easily adjust the high and low frequencies sent to both the midwoofer and the tweeter. Center channel speakers are great for those looking to have surround sound in their vehicle.
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
 
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
This means that the subwoofer/speaker is designed to be installed in areas that do not have a lot of space. Shallow mount subwoofers are typically found under a seat or behind the seat in some trucks.

Shallow mount speakers will typically have a mounting depth of 2" or less, while shallow mount subwoofers will typically have a mounting depth of 3" or less.
Designs such as cone, dome, semi-dome, balanced dome, and whizzer are most popular. Cone tweeters are simple, efficient and typically are the most reasonably priced. Dome tweeters are used in most home speakers, and provide a smoother and more accurate sound. Semi-dome design is one with a dome placed inside a cone. A Balanced dome driver is a semi-dome with equal reproduction area given the cone and dome portions of the driver. A whizzer tweeter is a separate tweeter cone driven by the voice coil of the woofer.
Many brands group their products into series or lines of products to help customers know the level of quality (good, better, best for example). You can filter by series and the brand using our guided browsing.
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Kenwood KFC-D101

440W Peak (100W RMS) 4" KFC Series 2-way Coaxial Car Speaker

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Kenwood KFC-D101

440W Peak (100W RMS) 4" KFC Series 2-way Coaxial Car Speaker

• 220 watts Peak Each, 50 watts RMS Each
• 1-3/16" Ceramic Balanced Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohms
• Sensitivity: 85 dB

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List $100.00
$69.99 /pair

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NVX NSP4

300W Peak (100W RMS) 4" N-Series 2-Way Coaxial Car Speakers with 20mm Silk Dome Tweeters

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NVX NSP4

300W Peak (100W RMS) 4" N-Series 2-Way Coaxial Car Speakers with 20mm Silk Dome Tweeters

• 150 watts Peak Each, 50 watts RMS Each
• 3/4" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohms
• Sensitivity: 85 dB
• Mounting Depth: 1.85"

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List $49.99
$34.99 /pair

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NVX VSP4

450W Peak (150W RMS) 4" V-Series 2-Way Coaxial Car Speakers with Silk Dome Tweeters

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NVX VSP4

450W Peak (150W RMS) 4" V-Series 2-Way Coaxial Car Speakers with Silk Dome Tweeters

• 225 watts Peak Each, 75 watts RMS Each
• 1" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohms
• Sensitivity: 86 dB
• Mounting Depth: 2.04"

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$49.99 /pair

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JL Audio C2-400x

210W Peak (70W RMS) 4” Evolution C2 Series 2-way Coaxial Car Speakers

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JL Audio C2-400x

210W Peak (70W RMS) 4” Evolution C2 Series 2-way Coaxial Car Speakers

• 105 watts Peak Each, 35 watts RMS Each
• 1" Silk Dome Tweeters
• Mica Injected Polypropylene - MIPP cone material
• Impedance: 4 ohms
• Sensitivity: 84.5 dB

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List $199.99
$179.99 /pair

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Pioneer TS-A1072R

300W Peak (40W RMS) 4” Midrange-Coaxial Speaker

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Pioneer TS-A1072R

300W Peak (40W RMS) 4” Midrange-Coaxial Speaker

• Peak Power: 300W
• RMS Power: 40W
• 3/8" Soft Dome Tweeter
• Mounting Depth: 1-11/16"
• Composite Injection Molded Polypropylene with Interlaced Aramid Fiber Cone
• 4 Ohms Impedance
• Sensitivity: 90dB

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List $70.00
$65.00 /pair

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Rockford Fosgate Prime R14X2

120W Peak (60W RMS) 4” Prime Series 2-way Coaxial Car Speaker

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Rockford Fosgate Prime R14X2

120W Peak (60W RMS) 4” Prime Series 2-way Coaxial Car Speaker

• 60 watts Peak Each, 30 watts RMS Each
• 1/2" Silk Dome Tweeters
• Vacuum Polypropylene cone material
• Impedance: 4 ohms
• Sensitivity: 85 dB

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$59.99 /pair

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Rockford Fosgate Punch P142

120W MAX (60W RMS) 4" Punch Series 2-Way Coaxial Car Speakers

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Rockford Fosgate Punch P142

120W MAX (60W RMS) 4" Punch Series 2-Way Coaxial Car Speakers

• 60 watts Peak Each, 30 watts RMS Each
• 3/4" PEI (Polyetherimide) Dome Tweeters
• Mineral-Filled Polypropylene cone material
• Impedance: 4 ohms
• Sensitivity: 86.5 dB

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Alpine S-S40

280W Peak (90W RMS) 4" S-Series 2-Way Coaxial Car Speakers

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Alpine S-S40

280W Peak (90W RMS) 4" S-Series 2-Way Coaxial Car Speakers

• 140 watts Peak Each, 45 watts RMS Each
• 3/4" Silk Dome Tweeters
• Carbon Fiber cone material
• Impedance: 4 ohms
• Sensitivity: 86 dB

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List $90.00
$79.95 /pair

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Kicker CSC44 (46CSC44)

150W Peak (50W RMS) 4” CS Series Coaxial Speakers with PEI Dome

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Kicker CSC44 (46CSC44)

150W Peak (50W RMS) 4” CS Series Coaxial Speakers with PEI Dome

• 75 watts Max Each, 25 watts RMS Each
• 1/2" PEI (Polyetherimide) Balanced Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohms
• Sensitivity: 88 dB
• Mounting Depth: 1/4"

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• 75 watts Max Each, 25 watts RMS Each
• 1/2" PEI (Polyetherimide) Balanced Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohms
• Sensitivity: 88 dB
• Mounting Depth: 1/4"

Kicker DSC404

240W Peak (60W RMS) 4" DS Series 2-Way Coaxial Car Speakers

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Kicker DSC404

240W Peak (60W RMS) 4" DS Series 2-Way Coaxial Car Speakers

• 120 watts Peak Each, 30 watts RMS Each
• 1/2" PEI (Polyetherimide) Balanced Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohms
• Sensitivity: 88 dB

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Cerwin Vega H740

550W Max (60W RMS) 4" HED Series 2-Way Coaxial Car Speakers

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Cerwin Vega H740

550W Max (60W RMS) 4" HED Series 2-Way Coaxial Car Speakers

• 275 watts Peak Each, 30 watts RMS Each
• 1" PEI (Polyetherimide) Balanced Dome Tweeters
• Graphite-injected reinforced spun cone material
• Impedance: 4 ohms
• Sensitivity: 82 dB

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$54.99 /pair

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Infinity Reference 4032cfx (REF-4032cfx)

210W Max (70W RMS) 4" Reference Series 2-Way Coaxial Car Speakers

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Infinity Reference 4032cfx (REF-4032cfx)

210W Max (70W RMS) 4" Reference Series 2-Way Coaxial Car Speakers

• 105 Watts Max Each, 35 Watts RMS Each
• Edge-Driven Textile Tweeter
• Plus One Polypropylene Oversized Cone
• 3 ohms Impedance
• Sensitivity: 92dB
• Mounting Depth: 1-7/8"

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• 105 Watts Max Each, 35 Watts RMS Each
• Edge-Driven Textile Tweeter
• Plus One Polypropylene Oversized Cone
• 3 ohms Impedance
• Sensitivity: 92dB
• Mounting Depth: 1-7/8"

JBL Stage3 427F (Stage 3 427F)

300Peak (60W RMS) 4" Stage 3 Series 2-Way Coaxial Car Speakers

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JBL Stage3 427F (Stage 3 427F)

300Peak (60W RMS) 4" Stage 3 Series 2-Way Coaxial Car Speakers

• 150 watts Peak Each, 30 watts RMS Each
• 3/4" Edge-driven Dome Tweeters
• Polypropylene cone material
• Impedance: 3 ohms
• Sensitivity: 90 dB

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List $89.95
$53.00 /pair

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JL Audio C1-400x

210W Max (70W RMS) 4" C1 Series 2-Way Coaxial Car Speakers

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JL Audio C1-400x

210W Max (70W RMS) 4" C1 Series 2-Way Coaxial Car Speakers

• 105 Watts Max Each, 35 Watts RMS Each
• .75" Edge-Driven Aluminum Dome Tweeter
• Mica-Filled Injection-Molded Polypropylene Cone
• 4 Ohms Impedance
• Sensitivity: 84.5 dB
• Mounting Depth: 1.81"

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$99.99 /pair

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Polk Audio DB402 DB+ 4-inch (DB 402)

270W Peak (90W RMS) 4" DB+ Series 2-way Car & Marine Coaxial Speakers

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Polk Audio DB402 DB+ 4-inch (DB 402)

270W Peak (90W RMS) 4" DB+ Series 2-way Car & Marine Coaxial Speakers

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

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Cerwin Vega XED42

500W Peak (40W RMS) 4" XED Series 2-Way Coaxial Car Speakers

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Cerwin Vega XED42

500W Peak (40W RMS) 4" XED Series 2-Way Coaxial Car Speakers

• 250 watts Peak Each, 20 watts RMS Each
• 1" Metallic Dome Tweeters
• Curvilinear polypropylene cone material
• Impedance: 4 ohms
• Sensitivity: 93 dB

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$23.99 /pair

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Kicker KSC404 (47KSC404)

150W Peak (75W RMS) 4” KS Series 2-Way Coaxial Speakers with Silk Dome Tweeters

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Kicker KSC404 (47KSC404)

150W Peak (75W RMS) 4” KS Series 2-Way Coaxial Speakers with Silk Dome Tweeters

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

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$79.96 /pair

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

Boss CH4230

450W Peak (225W RMS) 4" Chaos Exxtreme Series 3-Way Coaxial Car Speakers

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Boss CH4230

450W Peak (225W RMS) 4" Chaos Exxtreme Series 3-Way Coaxial Car Speakers

• 225 watts Peak Each, 112.5 watts RMS Each
• 1/2" Piezoelectric Dome Tweeters
• Polyurethane cone material
• Impedance: 4 ohms
• Sensitivity: 90 dB

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$24.99 /pair

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DS18 ZXI-44

300W Peak (100W RMS) 4" ZXi series 2-Way Coaxial Car Speakers

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DS18 ZXI-44

300W Peak (100W RMS) 4" ZXi series 2-Way Coaxial Car Speakers

• 150 watts Peak Each, 50 watts RMS Each
• 1" PEI (Polyetherimide) Dome Tweeters
• Glass Fiber cone material
• Impedance: 4 ohms
• Sensitivity: 88 dB

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• 150 watts Peak Each, 50 watts RMS Each
• 1" PEI (Polyetherimide) Dome Tweeters
• Glass Fiber cone material
• Impedance: 4 ohms
• Sensitivity: 88 dB

Hertz DCX100.3

120W Peak (60W RMS) 4" Dieci Series 2-Way Coaxial Car Speakers

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Hertz DCX100.3

120W Peak (60W RMS) 4" Dieci Series 2-Way Coaxial Car Speakers

• 30 Watts Max Each, 15 Watts RMS Each
• Water-repellent pressed paper cone material
• PEI dome tweeter
• 4 Ohms Impedance
• Sensitivity: 92 dB
• Mounting Depth: 1-3/4"

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    4” Car Speakers

    4" car speakers, also known as 4" coaxial speakers, are designed to fit into small spaces in your vehicle, such as the doors or dashboard. Marine and power sport vehicles commonly use 4" speakers because of their durability and reliability in harsh environments. As far as factory-installed car speakers go, the maximum tweeter size is 4 inches. They can produce highs, mids, and lows, allowing for crisp vocals and a thumping bass.

    4" car speakers typically have two components: a woofer and a tweeter. The woofer produces low-frequency sounds, such as bass and drums. At the same time, the tweeter handles high-frequency sounds, like vocals and cymbals. Some 4" speakers have a built-in crossover network that divides the audio signal and sends the appropriate frequencies to the woofer and tweeter.

    Upgrade your car's sound system with these convenient and affordable 4" car speakers. Though diminutive in size, they can produce high-quality audio with crisp vocals. Sonic Electronix carries a wide variety of aftermarket 4-inch automobile speakers from industry-leading brands, including NVX, Kicker, JL Audio, JBL, Rockford-Fosgate, Alpine, Kenwood, Cerwin-Vega, and many more.

    Popular Brands in 4" Speakers
    NVX
    Kicker
    JL Audio
    Infinity
    JBL
    Rockford Fosgate
    Alpine
    Cerwin-Vega
    Kenwood
    Hertz
    Pioneer
    Boss
    Polk Audio
    Memphis
    DS18

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    Take advantage of our VIP rewards like 10% back on your purchases, free 2-day shipping, extended warranties, and free returns! Gain access to all of these rewards without any membership fees.
    Get great discounted (and possibly FREE) installation accessories with most car stereo purchases. This includes dash kits, wiring harnesses and antenna adapters that you will need to properly install your new car stereo.
    We are an Authorized Dealer for all the brands we sell, including the most premium brands in car and marine audio such as Hertz, JL Audio, NVX, Rockford Fosgate, Kicker, Alpine, Kenwood and many more.
    Shop Deals and get up to 30% off premium brands! Shop Now! We are always looking out for the best products and deals to offer our customers. Don’t pay too much by shopping elsewhere!
    We have information on brands, gear, and more for you to explore! Check out our YouTube Channel for helpful how-to videos, product reviews, and Q&As. For a more detailed look, also visit our Learning Center!
    Our trained experts are here to assist you! They are just a phone call or click away to help you get the right gear for you and your vehicle!
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