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  1. Home
  2. Car Audio & Electronics
  3. Car Subwoofers
  4. 18" Car Subwoofers

18" Car Subwoofers

Find the best 18" car subs money can buy with our huge selection from all the top brands. 18-inch is the most popular size because of the amount of bass it generates and the overall bass produced. The top brands for 18" subs are NVX, JL Audio, Kicker, Rockford Fosgate, and Alpine.

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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.
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.
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.
Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
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.
Top-Mount Depth (Mounting Depth)
The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
Voice Coil(s)
Dual voice coil subs have more wiring flexibility than single voice coils subs; however, single voice coil subwoofers provide easier hookup options for wiring multiple subwoofers in parallel or series. You may also run a dual voice coil (DVC) sub in parallel, series, or combination. A quad voice coil has four voice coils and is equal to two dual voice coil subwoofers as far as wiring goes.
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.
Subwoofer Design
This is the design of the subwoofer or the opening of the subwoofer enclosure. Each design has it's own benefits, whether it is a square, circle, or oval.

Round/Circle: This is the typical and common subwoofer design. They have a round cone and are a circle in design.

Square: These woofers are able to achieve a greater cone area in a smaller space. Because of the greater surface area, some square subwoofers will be louder than a round subwoofer of the same size.

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".
Main Cone Color
This is the color of the speaker's or subwoofer's cone.
Recommended Enclosure Type
This is the recommended type of enclosure that the subwoofer should be installed into. Some subwoofers are specially designed for particular enclosures.

Sealed: These enclosures completely enclose the air inside the box. These boxes produce a tight bass.

Ported/Vented: These enclosures have a slot of air to escape from the box. The result is a sound that has more "boom".

Bandpass: These are a combination of both sealed and ported enclosures. They can be very efficient, but require tuning for the best response.

Xmax (millimeters)
Typically measured in millimeters, the Xmax value is the measure of a speaker cone's maximum excursion in one direction while maintaining a linear behavior.
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American Bass HD 18" (HD-1822)

4000W Peak (2000W RMS) 18" HD Series Dual 2-ohm Subwoofer

HD-1822 big
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American Bass HD 18" (HD-1822)

4000W Peak (2000W RMS) 18" HD Series Dual 2-ohm Subwoofer

• Peak Power: 4000 watts
• RMS Power: 2000 watts
• Impedance: Dual 2 ohm
• Kevlar Fiber-Enforced Non-Pressed Paper Cone
• Oversized 1.4" 3-layer Foam Surround
• Mount depth: 16.85"
• Sensitivity: 89 dB

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List price $861.70
-29% $609.29

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Earthquake Sound PRO-X188

1600W Peak (800W RMS) 18" PRO-X Series Single 8-ohm Car and PA Subwoofer

PRO-X188 big
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Earthquake Sound PRO-X188

1600W Peak (800W RMS) 18" PRO-X Series Single 8-ohm Car and PA Subwoofer

• Peak Power: 1600 watts
• RMS Power: 800 watts
• Impedance: Single 8 ohm
• Thin Pressed Paper Cone
• UV Treated Cloth Surround
• Mount depth: 7.67"
• Sensitivity: 98 dB

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• Peak Power: 1600 watts
• RMS Power: 800 watts
• Impedance: Single 8 ohm
• Thin Pressed Paper Cone
• UV Treated Cloth Surround
• Mount depth: 7.67"
• Sensitivity: 98 dB

Kicker L7X181 (49L7X181) - Pair

2000W RMS 18" SoloX Series Dual 1-ohm Subwoofer

49L7X181_2 big
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Kicker L7X181 (49L7X181) - Pair

2000W RMS 18" SoloX Series Dual 1-ohm Subwoofer

• RMS Power: 1000 - 2000 watts
• Impedance: Dual 1 ohm
• Double-pressed pulp Cone
• UV-resistant Santoprene Surround
• Mount depth: 13-3/16"

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• RMS Power: 1000 - 2000 watts
• Impedance: Dual 1 ohm
• Double-pressed pulp Cone
• UV-resistant Santoprene Surround
• Mount depth: 13-3/16"

Kicker L7X182 (49L7X182) - Pair

2000W RMS 18" SoloX Series Dual 2-ohm Subwoofer

49L7X182_2 big
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Kicker L7X182 (49L7X182) - Pair

2000W RMS 18" SoloX Series Dual 2-ohm Subwoofer

• RMS Power: 1000 - 2000 watts
• Impedance: Dual 2 ohm
• Double-pressed pulp Cone
• UV-resistant Santoprene Surround
• Mount depth: 13-3/16"

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List price $2099.98
-10% $1,899.98

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Only 1 Left!

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• RMS Power: 1000 - 2000 watts
• Impedance: Dual 2 ohm
• Double-pressed pulp Cone
• UV-resistant Santoprene Surround
• Mount depth: 13-3/16"

Sundown Audio NS v.6 D1 18" (NSV618D1) (Open Box, Great)

7000W Peak (3500W RMS) 18" Nightshade Series Dual 1-ohm Car Subwoofer (SW-NSV618D1)

SW-NSV618D1 big DISCONTINUED
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Sundown Audio NS v.6 D1 18" (NSV618D1) (Open Box, Great)

7000W Peak (3500W RMS) 18" Nightshade Series Dual 1-ohm Car Subwoofer (SW-NSV618D1)

• Peak Power: 7000 watts
• RMS Power: 3500 watts
• Impedance: Dual 1 ohm
• Polypropylene Cone
• Mega Roll V2 Surround
• Sensitivity: 87.47 dB

• Peak Power: 7000 watts
• RMS Power: 3500 watts
• Impedance: Dual 1 ohm
• Polypropylene Cone
• Mega Roll V2 Surround
• Sensitivity: 87.47 dB

DC Audio Level 6 18M6D1

8000W Peak (4500W RMS) 18" Level 6 Series M6 Version Dual 1-ohm Subwoofer

M6-LV518D1 big Out of stock
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DC Audio Level 6 18M6D1

8000W Peak (4500W RMS) 18" Level 6 Series M6 Version Dual 1-ohm Subwoofer

• Peak Power: 8000 watts
• RMS Power: 4500 watts
• Impedance: Dual 2 ohm
• Kraft Fiber-Reinforced Pulp Cone
• Wide Long Throw Foam Surround
• Mount depth: 14.0"
• Sensitivity: 86.92 dB

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$854.99
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• Peak Power: 8000 watts
• RMS Power: 4500 watts
• Impedance: Dual 2 ohm
• Kraft Fiber-Reinforced Pulp Cone
• Wide Long Throw Foam Surround
• Mount depth: 14.0"
• Sensitivity: 86.92 dB

American Bass Godfather 18" (GF-1822)

6000W Peak (3000W RMS) 18" Godfather Series Dual 2-ohm Car Subwoofer

GF-1822 big Out of stock
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American Bass Godfather 18" (GF-1822)

6000W Peak (3000W RMS) 18" Godfather Series Dual 2-ohm Car Subwoofer

• Peak Power: 6000 watts
• RMS Power: 3000 watts
• Impedance: Dual 2 ohm
• Non-Pressed Paper Cone
• High Roll Foam Surround
• Mount depth: 11.22"
• Sensitivity: 91.8 dB

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VIP Product Get $76.05 in rewards to spend later

List price $1205.68
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• Peak Power: 6000 watts
• RMS Power: 3000 watts
• Impedance: Dual 2 ohm
• Non-Pressed Paper Cone
• High Roll Foam Surround
• Mount depth: 11.22"
• Sensitivity: 91.8 dB

Sundown Audio Z-18 v.7 D1 18" (Z18V7D1)

7000W Peak (3500W RMS) 18" Z Series V7 Dual 1-ohm Car Subwoofer (SW-ZV718D1)

ZV718D1 big Out of stock
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Sundown Audio Z-18 v.7 D1 18" (Z18V7D1)

7000W Peak (3500W RMS) 18" Z Series V7 Dual 1-ohm Car Subwoofer (SW-ZV718D1)

• Peak Power: 7000 watts
• RMS Power: 3500 watts
• Impedance: Dual 1 ohm
• Treated Paper Cone
• Treated Foam Surround
• Sensitivity: 92.111 dB

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VIP Product Get $147.00 in rewards to spend later

List price $1679.99
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• Peak Power: 7000 watts
• RMS Power: 3500 watts
• Impedance: Dual 1 ohm
• Treated Paper Cone
• Treated Foam Surround
• Sensitivity: 92.111 dB

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