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.

6-1/2" (556)

3-1/2" (47)

6-1/2" (also 6-3/4" locations) (8)

Design

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.

2-way Coaxial (211)

2-way Component System (188)

Mid-range (122)

3-way Coaxial (26)

3-way Component Speakers (22)

Full-range (14)

Mid-bass (14)

Hybrid Coaxial Midrange (6)

RMS Power Handling

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.

Up to 34.99 watts (36)

35–54.99 watts (98)

55–74.99 watts (94)

75–99.99 watts (90)

100 watts or more (298)

Peak Power Handling

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.

Up to 99.99 watts (40)

100–199.99 watts (149)

200–299.99 watts (123)

300 watts or more (270)

Sensitivity

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".

Impedance (Per Voice Coil)

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.

Shallow Mount Installation

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.

No (494)

Yes (76)

Tweeter Design

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.

Dome (278)

Balanced Dome (57)

Edge Driven Dome (37)

Series

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.

PRO-X Series (18)

V Series (15)

CS Series (13)

Mille Pro Series (13)

Power Series (13)

Reference Series (12)

Apocalypse Series (9)

Stage 3 Gen 2 Series (6)

VEGA Series (6)

Diamond Elite Series (5)

Polk Audio MM1 Series (4)

Colossus Classic Series (3)

Mille Legend Series (3)

MM Series (3)

NEO Series (3)

PNW Series (3)

Pro Audio on Wheels Series (3)

Terminator Series (3)

Black Hydra Series (2)

Excelon Reference Series (2)

MotorSport Series (2)

MX Series (2)

Performance Series (2)

Shock Wave Series (2)

SPL Show Series (2)

Sport Series (2)

SQ Series (2)

Stroker Pro Series (2)

HEX Diamante Italia Series (1)

HEX Pro Diamante Italia Series (1)

HNX Series (1)

KFC Series (1)

KS Speaker Series (1)

Road Thunder Extreme Series (1)

Stage 2 Gen 2 Series (1)

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Condition

Availability

In stock. Ships from manufacturer (65)

Available to order (40)

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Rockford Fosgate Punch P1 P132

80W Peak (40W RMS) 3.5” Punch Series 2 Way Coaxial 4-ohm Speakers

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Rockford Fosgate Punch P1 P132

80W Peak (40W RMS) 3.5” Punch Series 2 Way Coaxial 4-ohm Speakers

• 40 watts Peak Each, 20 watts RMS Each
• 3/4" PEI (Polyetherimide) Dome tweeters
• Mineral-Filled Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 85 dB

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Front Door
Rear Deck Corner

$89.99 /pair

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Hertz C165F

360W Peak (140W RMS) 6.5" Cento Series 4-ohm Midbass Car Speakers

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Hertz C165F

360W Peak (140W RMS) 6.5" Cento Series 4-ohm Midbass Car Speakers

• 180 watts Peak Each, 70 watts RMS Each
• Semi-Pressed paper with Mica cone material
• Impedance: 4 ohm
• Sensitivity: 93 dB

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List price $230.00

-13% $199.99 /pair

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Deaf Bonce Apocalypse AP-M61SE Pro

600W Peak (300W RMS) 6.5" Apocalypse Series Pro Audio Midrange 4-ohm Car Speakers

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Deaf Bonce Apocalypse AP-M61SE Pro

600W Peak (300W RMS) 6.5" Apocalypse Series Pro Audio Midrange 4-ohm Car Speakers

• 300 watts Peak Each, 150 watts RMS Each
• Pressed Paper cone material
• Impedance: 4 ohm
• Sensitivity: 102.80 dB

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List price $143.99

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• 300 watts Peak Each, 150 watts RMS Each
• Pressed Paper cone material
• Impedance: 4 ohm
• Sensitivity: 102.80 dB

Deaf Bonce Apocalypse AP-M61SE

520W Peak (260W RMS) 6.5” Apocalypse Series Midrange 4-ohm Speakers

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Deaf Bonce Apocalypse AP-M61SE

520W Peak (260W RMS) 6.5” Apocalypse Series Midrange 4-ohm Speakers

• 260 watts Peak Each, 130 watts RMS Each
• Pressed Paper cone material
• Impedance: 4 ohm
• Sensitivity: 101.5 dB

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$109.90 /pair

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NVX VSP65

600W Peak (200W RMS) 6.5" V-Series 2 Way Coaxial Car Speakers

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NVX VSP65

600W Peak (200W RMS) 6.5" V-Series 2 Way Coaxial Car Speakers

• 300 watts Peak Each, 100 watts RMS Each
• 1" Silk Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 89 dB
• Mounting Depth: 2.51"

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2026-06-30 23:59:00

List price $119.99

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Kenwood KFC-1666S

600W Peak (60W RMS) 6.5" Sport Series 2 Way Coaxial 4-ohm Car Speakers

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Kenwood KFC-1666S

600W Peak (60W RMS) 6.5" Sport Series 2 Way Coaxial 4-ohm Car Speakers

• 300 watts Peak Each, 30 watts RMS Each
• 1" PEI (Polyetherimide) Balanced Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 90 dB

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2026-06-30 23:59:00

List price $80.00

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-39% $49.00 /pair

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NVX XQS65KIT Version 2 (XQS65KITv2)

600W Peak (300W RMS) 6.5" X-Series 2 Way Component Car Speakers

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NVX XQS65KIT Version 2 (XQS65KITv2)

600W Peak (300W RMS) 6.5" X-Series 2 Way Component Car Speakers

• 300 watts Peak Each, 150 watts RMS Each
• 1-1/8" Silk Dome tweeters
• Carbon Fiber cone material
• Impedance: 4 ohm
• Sensitivity: 93 dB

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List price $499.99

-20% $399.99 /set

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Kicker CSC35 (46CSC354)

180W Peak (60W RMS) 3.5” CS Series 2 Way Coaxial 4-ohm Speakers

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Kicker CSC35 (46CSC354)

180W Peak (60W RMS) 3.5” CS Series 2 Way Coaxial 4-ohm Speakers

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

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Front Door
Rear Deck Corner

2026-06-28 23:59:00

List price $74.99

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-31% $51.96 /pair

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JL Audio C2-650

200W RMS 6.5" C2 Series 2 Way Component 4-ohm Speakers

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JL Audio C2-650

200W RMS 6.5" C2 Series 2 Way Component 4-ohm Speakers

• 60 watts RMS Each
• 3/4" Silk Dome tweeters
• Mica Injected Polypropylene - MIPP cone material
• Impedance: 4 ohm
• Sensitivity: 91 dB

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$329.99 /set

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NVX XSP652

600W Peak (200W RMS) 6.5" X-Series 2 Way Coaxial Car Speakers

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NVX XSP652

600W Peak (200W RMS) 6.5" X-Series 2 Way Coaxial Car Speakers

• 300 watts Peak Each, 100 watts RMS Each
• 1" Silk Dome tweeters
• Lightweight Real Carbon Fiber cone
• Impedance: 4 ohm
• Sensitivity: 92 dB
• Mounting Depth: 2.52"

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List price $179.99

-33% $119.99 /pair

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Alpine R2-S652

600W Peak (200W RMS) 6.5" R-Series PRO 2-way 4-ohm Hi-Res Component Speaker System

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Alpine R2-S652

600W Peak (200W RMS) 6.5" R-Series PRO 2-way 4-ohm Hi-Res Component Speaker System

• 300 watts Peak Each, 100 watts RMS Each
• 1" Magnesium Hard Dome tweeters
• Reinforced Glass Fiber cone material
• Impedance: 4 ohm
• Sensitivity: 88 dB

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2026-07-15 23:59:00

List price $600.00

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-33% $399.95 /set

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Rockford Fosgate Punch P1 P1650

220W Peak (110W RMS) 6.5" Punch P1 Series 2 Way Coaxial 4-ohm Speakers

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Rockford Fosgate Punch P1 P1650

220W Peak (110W RMS) 6.5" Punch P1 Series 2 Way Coaxial 4-ohm Speakers

• 110 watts Peak Each, 55 watts RMS Each
• 3/4" PEI (Polyetherimide) Dome tweeters
• Mineral-Filled Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 88 dB

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$109.99 /pair

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JL Audio C1-650x

100W RMS 6.5" C1 Series 2 Way Coaxial 4-ohm Car Speakers

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JL Audio C1-650x

100W RMS 6.5" C1 Series 2 Way Coaxial 4-ohm Car Speakers

• 50 watts RMS Each
• 3/4" Silk-Suspended Aluminum Dome tweeters
• Mineral-Filled Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 90.5 dB

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$129.99 /pair

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JL Audio CF-275mt

60W RMS 2.75" CF Series Custom-Fit Midrange 4-ohm Tweeters

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JL Audio CF-275mt

60W RMS 2.75" CF Series Custom-Fit Midrange 4-ohm Tweeters

• 2-3/4" CF Series Midtweeters
• 30 watts RMS Each
• 4 ohm Impedance

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$169.99 /pair

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JL Audio C1-650

100W RMS 6.5" C1 Series 2 Way Component 4-ohm Car Speakers

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JL Audio C1-650

100W RMS 6.5" C1 Series 2 Way Component 4-ohm Car Speakers

• 50 watts RMS Each
• 3/4" Silk-Suspended Aluminum Edge Driven Dome tweeters
• Mineral-Filled Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 90.5 dB

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$159.99 /set

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Cerwin-Vega H735

500W Peak (60W RMS) 3.5" HED Series 2-Way Coaxial 4-ohm Speakers

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Cerwin-Vega H735

500W Peak (60W RMS) 3.5" HED Series 2-Way Coaxial 4-ohm Speakers

• 250 watts Peak Each, 30 watts RMS Each
• 1" PEI (Polyetherimide) Balanced Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 84.5 dB

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List price $71.99

-17% $59.99 /pair

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Cerwin-Vega V3

360W Peak (120W RMS) 3" Vega Series 2025 Edition 2-Way Coaxial 4-ohm Speakers

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Cerwin-Vega V3

360W Peak (120W RMS) 3" Vega Series 2025 Edition 2-Way Coaxial 4-ohm Speakers

• 180 watts Peak Each, 60 watts RMS Each
• 1/2" Silk Balanced Dome Tweeters
• Carbon Fiber Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 83 dB

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$89.99 /pair

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DS18 PRO-X6.4BMPK

1000W Peak (500W RMS) 6.5” PRO-X Series 4-ohm Pro Audio Component Speakers Set

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DS18 PRO-X6.4BMPK

1000W Peak (500W RMS) 6.5” PRO-X Series 4-ohm Pro Audio Component Speakers Set

• 500 watts Peak Each, 250 watts RMS Each
• 1" Aluminum Bullet super tweeters with ferrite magnets
• Non-Pressed Paper cone material
• Impedance: 4 ohm
• Sensitivity: 94 dB

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$139.95 /set

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Hertz CK 165

570W Peak (190W RMS) 6.5" Cento Series 2-way 4-ohm Component Speaker System

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Hertz CK 165

570W Peak (190W RMS) 6.5" Cento Series 2-way 4-ohm Component Speaker System

• 285 watts Peak Each, 95 watts RMS Each
• 1" Tetolon Soft Dome tweeters with neodymium magnets
• Semi-Pressed paper with Mica cone material
• Impedance: 4 ohm
• Sensitivity: 93 dB

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List price $480.00

-17% $399.99 /set

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JBL Stage2 634 (STAGE2634)

500W Peak (80W RMS) 6.5" Stage2 Series 3 Way Coaxial 4-ohm Speakers

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JBL Stage2 634 (STAGE2634)

500W Peak (80W RMS) 6.5" Stage2 Series 3 Way Coaxial 4-ohm Speakers

• 250 watts Peak Each, 40 watts RMS Each
• PEI (Polyetherimide) Balanced Dome tweeters
• Injection Molded Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 91 dB

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List price $99.99

-26% $73.99 /pair

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FAQ for Front Door Speakers in 2021 S4

Q: Can I upgrade or change the Front Door Speakers in 2021 Audi S4?

A: Yes this page includes all the best Front Door Speakers that work in your S4.

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Front Door for 2021 Audi S4

Rockford Fosgate Punch P1 P132

Rockford Fosgate Punch P1 P132

Hertz C165F

Hertz C165F

Deaf Bonce Apocalypse AP-M61SE Pro

Deaf Bonce Apocalypse AP-M61SE Pro

Deaf Bonce Apocalypse AP-M61SE

Deaf Bonce Apocalypse AP-M61SE

NVX VSP65

NVX VSP65

Kenwood KFC-1666S

Kenwood KFC-1666S

NVX XQS65KIT Version 2 (XQS65KITv2)

NVX XQS65KIT Version 2 (XQS65KITv2)

Kicker CSC35 (46CSC354)

Kicker CSC35 (46CSC354)

JL Audio C2-650

JL Audio C2-650

NVX XSP652

NVX XSP652

Alpine R2-S652

Alpine R2-S652

Rockford Fosgate Punch P1 P1650

Rockford Fosgate Punch P1 P1650

JL Audio C1-650x

JL Audio C1-650x

JL Audio CF-275mt

JL Audio CF-275mt

JL Audio C1-650

JL Audio C1-650

Cerwin-Vega H735

Cerwin-Vega H735

Cerwin-Vega V3

Cerwin-Vega V3

DS18 PRO-X6.4BMPK

DS18 PRO-X6.4BMPK

Hertz CK 165

Hertz CK 165

JBL Stage2 634 (STAGE2634)

JBL Stage2 634 (STAGE2634)

FAQ for Front Door Speakers in 2021 S4

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