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.

800–1,200 watts (2)

1,200–2,000 watts (6)

2,000 watts and up (4)

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 300 watts (10)

2,400 watts and up (2)

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.

M Series (2)

Nightshade (NS) Series (2)

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.

No (11)

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.

Dual (2 voice coils) (10)

Triple (3 voice coils) (1)

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.

2 (6)

1 (4)

4 (2)

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.

Round (12)

Minimum Sealed Box Volume

This value indicates the minimum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.

Up to 1 cubic feet (12)

Maximum Sealed Box Volume

This value indicates the maximum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.

Up to 0 cubic feet (12)

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".

85–90 dB (10)

90–95 dB (2)

Main Cone Color

This is the color of the speaker's or subwoofer's cone.

Black (12)

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.

Bandpass (2)

Ported / Vented (12)

Sealed (4)

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.

15 mm and up (12)

Deals

Promotions we have offer More Ways to Shop for items that are on clearance, last chance, special offer and sales, Made in America, and more!

Dads & Grads Sale (5)

VIP (12)

Availability

In Stock (9)

Out of stock (3)

Available to order (4)

Shop the Category

Filters & Sort

Sort

Best Match

Best Rated
Biggest $ savings off list price
Biggest % savings off list price
Price: Lowest First
Price: Highest First
Product Name: A-Z
Product Name: Z-A
Newest First

Sundown Audio MD18D1

4000W Peak (2000W RMS) 18" M Series Dual 1-ohm Subwoofer

Compare

Go to item page

Sundown Audio MD18D1

4000W Peak (2000W RMS) 18" M Series Dual 1-ohm Subwoofer

• Peak Power: 4000 watts
• RMS Power: 2000 watts
• Impedance: Dual 1 ohm
• Polypropylene Cone
• High Roll Foam Surround
• Mount depth: 14.05"
• Sensitivity: 85.836 dB

Free shipping in USA. Provide zip for delivery date.

VIP Product Get $60.00 in rewards to spend later

empty

Was $719.99 Details

$599.99

In stock

Only 1 Left!

Add to Cart

• Peak Power: 4000 watts
• RMS Power: 2000 watts
• Impedance: Dual 1 ohm
• Polypropylene Cone
• High Roll Foam Surround
• Mount depth: 14.05"
• Sensitivity: 85.836 dB

Sundown Audio X V.3 18" D2

2000W RMS 18" X Series Dual 2-ohm Car Subwoofer

Compare

Go to item page

Sundown Audio X V.3 18" D2

2000W RMS 18" X Series Dual 2-ohm Car Subwoofer

• RMS Power: 2000 watts
• Impedance: Triple 2 ohm
• Mount depth: 13.6"
• Sensitivity: 87.6 dB

Free shipping in USA. Provide zip for delivery date.

VIP Product Get $85.00 in rewards to spend later

empty

Was $1127.99 Details

$849.99

In stock

Only 1 Left!

Add to Cart

• RMS Power: 2000 watts
• Impedance: Triple 2 ohm
• Mount depth: 13.6"
• Sensitivity: 87.6 dB

Sundown Audio X V.3 18" D1

2000W RMS 18" X Series Dual 1-ohm Car Subwoofer

Compare

Go to item page

Sundown Audio X V.3 18" D1

2000W RMS 18" X Series Dual 1-ohm Car Subwoofer

• RMS Power: 2000 watts
• Impedance: Dual 1 ohm
• Mount depth: 13.6"
• Sensitivity: 88.6 dB

Free shipping in USA. Provide zip for delivery date.

VIP Product Get $85.00 in rewards to spend later

empty

Was $1127.99 Details

$849.99

In stock

Only 2 Left!

Add to Cart

• RMS Power: 2000 watts
• Impedance: Dual 1 ohm
• Mount depth: 13.6"
• Sensitivity: 88.6 dB

Sundown Audio SAV2 18″ D4

1000W RMS 18" SA Series Dual 4-ohm Car Subwoofer

Compare

Go to item page

Sundown Audio SAV2 18″ D4

1000W RMS 18" SA Series Dual 4-ohm Car Subwoofer

• RMS Power: 1000 watts
• Impedance: Dual 4 ohm
• Competition Grade Paper Cone
• Foam Surround
• Mount depth: 10.125"
• Sensitivity: 90.7 dB

Free shipping in USA. Provide zip for delivery date.

VIP Product Get $50.00 in rewards to spend later

empty

Was $599.99 Details

$499.99

In stock

Only 1 Left!

Add to Cart

• RMS Power: 1000 watts
• Impedance: Dual 4 ohm
• Competition Grade Paper Cone
• Foam Surround
• Mount depth: 10.125"
• Sensitivity: 90.7 dB

Sundown Audio SW-SAV218D2

1000W RMS 18" SA Series Dual 2-ohm Subwoofer

Compare

Go to item page

Sundown Audio SW-SAV218D2

1000W RMS 18" SA Series Dual 2-ohm Subwoofer

• RMS Power: 1000 watts
• Impedance: Dual 2 ohm
• Competition Grade Paper Cone
• Foam Surround
• Mount depth: 10.125"
• Sensitivity: 90.1 dB

Free shipping in USA. Provide zip for delivery date.

VIP Product Get $50.00 in rewards to spend later

empty

Was $599.99 Details

$499.99

In stock

Only 1 Left!

Add to Cart

• RMS Power: 1000 watts
• Impedance: Dual 2 ohm
• Competition Grade Paper Cone
• Foam Surround
• Mount depth: 10.125"
• Sensitivity: 90.1 dB

Sundown Audio UV.2 18" D4

1750W RMS 18" U Series Dual 4-ohm Car Subwoofer

Compare

Go to item page

Sundown Audio UV.2 18" D4

1750W RMS 18" U Series Dual 4-ohm Car Subwoofer

• RMS Power: 1750 watts
• Impedance: Dual 4 ohm
• Mount depth: 10"
• Sensitivity: 88.8733 dB

Free shipping in USA. Provide zip for delivery date.

VIP Product Get $72.00 in rewards to spend later

empty

Was $863.99 Details

$719.99

Available

Ships in 10-14 days

Add to Cart

• RMS Power: 1750 watts
• Impedance: Dual 4 ohm
• Mount depth: 10"
• Sensitivity: 88.8733 dB

Sundown Audio UV.2 18" D2

1750W RMS 18" U Series Dual 2-ohm Car Subwoofer

Compare

Go to item page

Sundown Audio UV.2 18" D2

1750W RMS 18" U Series Dual 2-ohm Car Subwoofer

• RMS Power: 1750 watts
• Impedance: Dual 2 ohm
• Mount depth: 10"
• Sensitivity: 89.4169 dB

Free shipping in USA. Provide zip for delivery date.

VIP Product Get $72.00 in rewards to spend later

empty

Was $863.99 Details

$719.99

Available

Ships in 10-14 days

Add to Cart

• RMS Power: 1750 watts
• Impedance: Dual 2 ohm
• Mount depth: 10"
• Sensitivity: 89.4169 dB

Sundown Audio NS6 V.6 18" D2

3000W RMS 18" Nightshade NS Series Dual 2-ohm Car Subwoofer

Compare

Go to item page

Sundown Audio NS6 V.6 18" D2

3000W RMS 18" Nightshade NS Series Dual 2-ohm Car Subwoofer

• RMS Power: 3000 watts
• Impedance: Dual 2 ohm
• Mega Roll V2 Surround
• Mount depth: 16.3"
• Sensitivity: 87.58 dB

Free shipping in USA. Provide zip for delivery date.

VIP Product Get $153.00 in rewards to spend later

empty

Was $1835.99 Details

$1,529.99

Available

Ships in 10-14 days

Add to Cart

• RMS Power: 3000 watts
• Impedance: Dual 2 ohm
• Mega Roll V2 Surround
• Mount depth: 16.3"
• Sensitivity: 87.58 dB

Sundown Audio NS6 V.6 18" D1

3000W RMS 18" Nightshade NS Series Dual 1-ohm Car Subwoofer

Compare

Go to item page

Sundown Audio NS6 V.6 18" D1

3000W RMS 18" Nightshade NS Series Dual 1-ohm Car Subwoofer

• RMS Power: 3000 watts
• Impedance: 1 ohm
• Mega Roll V2 Surround
• Mount depth: 16.3"
• Sensitivity: 87.47 dB

Free shipping in USA. Provide zip for delivery date.

VIP Product Get $153.00 in rewards to spend later

empty

Was $1739.99 Details

$1,529.99

Available

Ships in 10-14 days

Add to Cart

• RMS Power: 3000 watts
• Impedance: 1 ohm
• Mega Roll V2 Surround
• Mount depth: 16.3"
• Sensitivity: 87.47 dB

Sundown Audio ZV6 18" D2

2500W RMS 18" Z Series Dual 2-ohm Car Subwoofer

Out of stock

Compare

Go to item page

Sundown Audio ZV6 18" D2

2500W RMS 18" Z Series Dual 2-ohm Car Subwoofer

• RMS Power: 2500 watts
• Impedance: Dual 2 ohm
• Mega Roll V2 Surround
• Mount depth: 14.92"
• Sensitivity: 87.58 dB

VIP Product Get $115.00 in rewards to spend later

empty

Was $1379.99 Details

$1,149.99

Add to Cart

• RMS Power: 2500 watts
• Impedance: Dual 2 ohm
• Mega Roll V2 Surround
• Mount depth: 14.92"
• Sensitivity: 87.58 dB

Sundown Audio ZV6 18" D1

2500W RMS 18" Z Series Dual 1-ohm Car Subwoofer

Out of stock

Compare

Go to item page

Sundown Audio ZV6 18" D1

2500W RMS 18" Z Series Dual 1-ohm Car Subwoofer

• RMS Power: 2500 watts
• Impedance: Dual 1 ohm
• Mega Roll V2 Surround
• Mount depth: 14.92"
• Sensitivity: 87.51 dB

VIP Product Get $115.00 in rewards to spend later

empty

Was $1199.99 Details

$1,149.99

Add to Cart

• RMS Power: 2500 watts
• Impedance: Dual 1 ohm
• Mega Roll V2 Surround
• Mount depth: 14.92"
• Sensitivity: 87.51 dB

Sundown Audio SW-MD18D2

4000W Peak (2000W RMS) 15" M Series Dual 2-ohm Subwoofer

Out of stock

Compare

Go to item page

Sundown Audio SW-MD18D2

4000W Peak (2000W RMS) 15" M Series Dual 2-ohm Subwoofer

• Peak Power: 4000 watts
• RMS Power: 2000 watts
• Impedance: Dual 2 ohm
• Polypropylene Cone
• High Roll Foam Surround
• Mount depth:
• Sensitivity: 86.102 dB

VIP Product Get $60.00 in rewards to spend later

empty

Was $719.99 Details

$599.99

Add to Cart

• Peak Power: 4000 watts
• RMS Power: 2000 watts
• Impedance: Dual 2 ohm
• Polypropylene Cone
• High Roll Foam Surround
• Mount depth:
• Sensitivity: 86.102 dB

Clear all

We love people and we're ready to help you! See what separates us from our competition.

Free perks, no Prime^TM fees

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.

Free install gear for stereos

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.

Authentic & Authorized

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.

View best sellers, deals, and 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!

Learn about All Car Audio

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!

Call or email our experts

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!

Why Shop With Us?

Welcome to the Team!

Sundown Audio 18" Car Subwoofers

Shop the Category

Sundown Audio MD18D1

Sundown Audio MD18D1

Sundown Audio X V.3 18" D2

Sundown Audio X V.3 18" D2

Sundown Audio X V.3 18" D1

Sundown Audio X V.3 18" D1

Sundown Audio SAV2 18″ D4

Sundown Audio SAV2 18″ D4

Sundown Audio SW-SAV218D2

Sundown Audio SW-SAV218D2

Sundown Audio UV.2 18" D4

Sundown Audio UV.2 18" D4

Sundown Audio UV.2 18" D2

Sundown Audio UV.2 18" D2

Sundown Audio NS6 V.6 18" D2

Sundown Audio NS6 V.6 18" D2

Sundown Audio NS6 V.6 18" D1

Sundown Audio NS6 V.6 18" D1

Sundown Audio ZV6 18" D2

Sundown Audio ZV6 18" D2

Sundown Audio ZV6 18" D1

Sundown Audio ZV6 18" D1

Sundown Audio SW-MD18D2

Sundown Audio SW-MD18D2

Account

Shopping help

Company

Everyday heroes

Brand stores

Useful links

Subscribe

Welcome to the Team!

Sundown Audio 18" Car Subwoofers

Shop the Category

Sundown Audio MD18D1

Sundown Audio MD18D1

Sundown Audio X V.3 18" D2

Sundown Audio X V.3 18" D2

Sundown Audio X V.3 18" D1

Sundown Audio X V.3 18" D1

Sundown Audio SAV2 18″ D4

Sundown Audio SAV2 18″ D4

Sundown Audio SW-SAV218D2

Sundown Audio SW-SAV218D2

Sundown Audio UV.2 18" D4

Sundown Audio UV.2 18" D4

Sundown Audio UV.2 18" D2

Sundown Audio UV.2 18" D2

Sundown Audio NS6 V.6 18" D2

Sundown Audio NS6 V.6 18" D2

Sundown Audio NS6 V.6 18" D1

Sundown Audio NS6 V.6 18" D1

Sundown Audio ZV6 18" D2

Sundown Audio ZV6 18" D2

Sundown Audio ZV6 18" D1

Sundown Audio ZV6 18" D1

Sundown Audio SW-MD18D2

Sundown Audio SW-MD18D2

Didn't find your car?

Account

Shopping help

Company

Everyday heroes

Brand stores

Useful links