Garage
Shop
Account Icon
Account
Box Icon
Track
order
Telephone Icon
Call
Help Icon
Help
Door with Arrow Icon
Sign In
  1. Home
  2. DS18 Store
  3. DS18 Car Audio & Electronics
  4. DS18 Car Subwoofers
  5. DS18 Underseat Subwoofers

DS18 Underseat Subwoofers

Filters
DS18 ✕
Clear Filters
Reset Done
Price Range
Product Fitment Type
Is Amplifier Wiring Kit included?
Number of Subwoofers
This value represents the number of subwoofers that the enclosure accommodates or that are included in the package or bundled kit.
Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
Box Type
Represents the style of the enclosure. Be sure to purchase the appropriate enclosure type and internal volume that will be compatible with your subwoofer's recommendation.

Sealed - Sealed boxes are those that have no holes or vents in it. The only hole in a sealed box is where the subwoofer is installed. Smaller sealed boxes require more power than a larger sealed box. They provide a tight, accurate bass, while the larger sealed enclosures provide a "boomier" and louder bass.

Ported / Vented - Ported/Vented Enclosures provide an even boomier, louder bass, but less accurate then a small, sealed box. Ported enclosures typically require more airspace per sub and also less power output from an amplifier to perform correctly.

Bandpass - Bandpass enclosures make subwoofers perform efficiently, but loose. The bass is not as "boomy" as a ported enclosure nor as punchy as a sealed enclosure. Bandpass enclosures work well with lower to mid-level subwoofers.
Total RMS Power Handling
This is the total RMS power handling of all the subwoofers included in the package or enclosure.

If the loaded enclosure or amplifier and subwoofer package includes more than a single subwoofer, then this is the total RMS power handling for all of the subs combined.

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 giving your subwoofer(s) 75% - 90% of the recommended RMS rating.
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!
Availability
Checkmark Icon Select vehicle to make sure it fits.

Shop the Category

filter-icon Filters & Sort
Limited time!

DS18 SQBASSx2

1200W Peak (230W RMS) 7x9" Car Subwoofer with Passive Radiator

SQBASSx2 big
Go to item page Right Arrow Icon of Right Arrow

DS18 SQBASSx2

1200W Peak (230W RMS) 7x9" Car Subwoofer with Passive Radiator

• Single 7 X 9" Sealed Subwoofer Enclosure with Built-In Amplifier
• Built-In/Includes Class D Amplifier
• Enclosure Dimensions: 7.87" D x 12.12" W x 2.79" H

shipping truck icon
FREE 1-day shipping to OH. Get it Wed, Nov. 19
VIP Star Icon

VIP Product Get $21.20 in rewards to spend later

empty

Universal Fitment Icon Universal-fit, works with nearly all vehicles.

Was $264.95 Details
Save $52.99
$211.96

In stock

Only 1 Left!

Add to Cart

• Single 7 X 9" Sealed Subwoofer Enclosure with Built-In Amplifier
• Built-In/Includes Class D Amplifier
• Enclosure Dimensions: 7.87" D x 12.12" W x 2.79" H

Limited time!

DS18 SQBASS8

800W Peak (150W RMS) 8" Amplified Underseat Subwoofer with Bass Remote

SQBASS8 big
Go to item page Right Arrow Icon of Right Arrow

DS18 SQBASS8

800W Peak (150W RMS) 8" Amplified Underseat Subwoofer with Bass Remote

• 8" Underseat Subwoofer with Amplifier
• 800 watts Peak / 150 watts RMS
• Built-In Class D Amplifier
• Variable Bass Boost
• Speaker-Level Inputs
• Wired Remote Bass Level Control

shipping truck icon
FREE 1-day shipping to OH. Get it Wed, Nov. 19
VIP Star Icon

VIP Product Get $22.08 in rewards to spend later

empty

Universal Fitment Icon Universal-fit, works with nearly all vehicles.

Was $275.95 Details
Save $55.19
$220.76

In stock

Add to Cart

• 8" Underseat Subwoofer with Amplifier
• 800 watts Peak / 150 watts RMS
• Built-In Class D Amplifier
• Variable Bass Boost
• Speaker-Level Inputs
• Wired Remote Bass Level Control

Limited time!

DS18 SQBASS68

600W Peak (150W RMS) 6X8" SQBASS68 Series Amplified Subwoofer

SQBASS68 big
Go to item page Right Arrow Icon of Right Arrow

DS18 SQBASS68

600W Peak (150W RMS) 6X8" SQBASS68 Series Amplified Subwoofer

• 6 X 8" Amplified Loaded Subwoofer System
• 150 watts RMS
• Built-In Class D Amplifier
• Variable Bass Boost
• Speaker-Level Inputs
• Wired Remote Bass Level Control

shipping truck icon
FREE shipping to OH. Delivers Nov. 26 - Nov. 28
VIP Star Icon

VIP Product Get $17.60 in rewards to spend later

empty

Universal Fitment Icon Universal-fit, works with nearly all vehicles.

Was $219.95 Details
Save $43.99
$175.96

In stock.

Add to Cart

• 6 X 8" Amplified Loaded Subwoofer System
• 150 watts RMS
• Built-In Class D Amplifier
• Variable Bass Boost
• Speaker-Level Inputs
• Wired Remote Bass Level Control

 
    Clear all
    why-shoping-with-sonic

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

    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!
    Why Shop With Us?
    Save up to 10 different vehicles in your garage

    Add vehicle
    2 | Make
    3 | Model
    Where to find vehicle info | Shop without vehicle
    Whoa! Slow down. Add your details below!
    additional information required
    Add vehicle details to confirm fitment
    Ignore fitment details
    Find stereos and more that work -- fast.
    2 | Make
    3 | Model
    Remove

    Can't find your vehicle? Click here and we'll help.

    Where to find vehicle info

    Go to Fitment

    Didn't find your car?

    Submit your details and we'll help!
    Please enter the letters as they are shown in the image above. Letters are not case-sensitive.
    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
    Back
    Track your order
    Call our experts
    Support Center
    Return & Exchanges
    Follow on Instagram Instagram logo
    Subscribe on YouTube YouTube logo