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Deal.ai › Sundown Audio
Sundown Audio
SW-M18D1 Sundown Audio M-Series 18" Subwoofer 2000W RMS 1 Ohm DVC
Sundown Audio

SW-M18D1 Sundown Audio M-Series 18" Subwoofer 2000W RMS 1 Ohm DVC

Best price now

$699.99at Liberty Bass ShopChecked 42 min ago

Compared across 10 stores. Prices are checked against each store and labelled with when.

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Price facts

  • Lowest price today: $699.99 at Liberty Bass Shop (checked Nov 12, 2026).
  • Checked at 10 stores.

Our take on the SW-M18D1 Sundown Audio M-Series 18" Subwoofer 2000W RMS 1 Ohm DVC

The Sundown Audio M-Series 18 is a large-format car subwoofer built for high output. It handles 2000W RMS and 4000W peak, with a dual 1-ohm voice coil wiring to a 0.5-ohm or 2-ohm final load. A quad-stack magnet, mega roll surround and 35mm of Xmax give it serious excursion and low-end extension, with an FS around 26 Hz. It suits SPL and daily-bass builds with the electrical and enclosure support to feed it; it is not a drop-in upgrade for a stock system.

Best forSPL and competition bass buildsDaily drivers with high-output electrical upgradesLarge vented or bandpass enclosuresOwners who want deep, loud low bass
Pros
  • 2000W RMS and 4000W peak power handling
  • Dual 1-ohm voice coil for flexible final impedance
  • 35mm Xmax for long excursion
  • Quad-stack magnet and mega roll surround
  • Low FS around 26 Hz for deep bass
Cons
  • Needs a large enclosure and strong electrical support
  • Low sensitivity around 86 dB demands plenty of amplifier power
  • Heavy motor assembly makes installation demanding
  • Not suited to small sealed boxes or stock systems

SW-M18D1 Sundown Audio M-Series 18" Subwoofer 2000W RMS 1 Ohm DVC prices at every store

  • Liberty Bass ShopNew

    In stock

    $699.99Checked 42 min ago
    Visit Liberty Bass Shop
  • WalmartNew

    In stockSold by D-C-O

    $699.99Free shippingChecked 42 min ago
    Visit Walmart
  • Down4soundshopNew

    In stock

    $749.99Free shippingChecked 42 min ago
    Visit Down4soundshop
  • Sundown AudioNew

    In stock

    $749.99+ $51.00 shippingChecked 42 min ago
    Visit Sundown Audio
  • SonicElectronix.comNew

    Availability unknown

    $749.99Checked 42 min ago
    Visit SonicElectronix.com
  • eBayNew

    Availability unknownSold by mooncarstereo

    $749.99Checked 42 min ago
    Visit eBay
  • mooncarstereoNew

    Availability unknown

    $749.99Checked 42 min ago
    Visit mooncarstereo
  • GP Car AudioNew

    Availability unknown

    $749.99Checked 42 min ago
    Visit GP Car Audio
  • Elite Auto GearNew

    Availability unknown

    $749.99Checked 42 min ago
    Visit Elite Auto Gear
  • Pro Audio CenterNew

    Availability unknown

    $749.99Checked 42 min ago
    Visit Pro Audio Center

Also available at

  • Pro Audio CenterCheck price at Pro Audio Center

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SW-M18D1 Sundown Audio M-Series 18" Subwoofer 2000W RMS 1 Ohm DVC price history

Lowest price we've seen: $699.99 on Nov 12 at Walmart. Tracked across 10 stores since Nov 12.

What reviewers say

Owners of Sundown's M-Series describe it as a loud, deep subwoofer that takes abuse and rewards proper enclosure and power. Most praise its output and build for the money; complaints center on the space and amplifier power it demands.

What people mention
  • OutputPraisedOwners say it plays very loud and deep when fed clean power.
  • Power handlingPraisedReviewers report it takes rated power and abuse without failing.
  • BuildPraisedThe quad-stack motor and surround are described as sturdy.
  • Enclosure sizeCriticisedOwners note it needs a large enclosure to perform well.
  • Amplifier demandMixedIts low sensitivity means it needs a strong amplifier, which some find costly.

About the SW-M18D1 Sundown Audio M-Series 18" Subwoofer 2000W RMS 1 Ohm DVC

The Sundown Audio M-Series SW-M18D1 is an 18-inch subwoofer rated at 2000 W RMS and 4000 W peak. It has a dual 1 ohm voice coil.

It is built with a quad stack magnet structure, a mega roll surround and frame, and an etched all-black backplate.

For enclosures, a ported design is recommended. A sealed enclosure is not recommended. A 4th order design is also listed.

Size
18 inches
Power
2000 W RMS, 4000 W peak
Voice coil
Dual 1 ohm
Magnet
Quad stack structure
Surround
Mega roll surround and frame
Backplate
Etched, all black
Xmax
35 mm
Sensitivity
85.836 dB @ 1 W/1 m
Re
2.12 ohms
Fs
26.152 Hz
Vas
112.182 L
Qes / Qms / Qts
0.782 / 5.452 / 0.684
Le
1.797 mH
BL
17.044
Mms
651.24 g
Cms
56.86 uM/N

Questions and answers

What final impedance can the dual 1-ohm coils wire to?
The two 1-ohm coils wire in parallel to 0.5 ohm or in series to 2 ohms. Check that your amplifier is stable at the load you choose.
How much power does it need?
It is rated 2000W RMS and 4000W peak. Plan for an amplifier and electrical system that can deliver clean power near that RMS figure.
What size enclosure does it need?
The 18-inch driver with 35mm Xmax and low FS works best in a large vented or bandpass box. Small sealed enclosures will not let it reach its potential.
Is it good for daily driving or only competition?
It can work in a daily build, but it is aimed at high-output SPL use. It needs the space, power and electrical upgrades that come with that.
What is in the box?
The subwoofer itself. Wiring, enclosure and amplifier are not included and must be matched separately.
Where is the SW-M18D1 Sundown Audio M-Series 18" Subwoofer 2000W RMS 1 Ohm DVC cheapest?
At Liberty Bass Shop, for $699.99, as of our latest check.
Where can I buy the SW-M18D1 Sundown Audio M-Series 18" Subwoofer 2000W RMS 1 Ohm DVC?
10 stores we checked sell it, including Liberty Bass Shop, Walmart, Sundown Audio, Down4soundshop, SonicElectronix.com.

Stores we've priced the SW-M18D1 Sundown Audio M-Series 18" Subwoofer 2000W RMS 1 Ohm DVC at

  • SonicElectronix.com deals and prices
  • Walmart deals and prices

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Sealed enclosure
Not recommended
Ported enclosure
7.0 cu ft, tuned to 32 Hz, 112 sq in port area
4th order enclosure
3.0 cu ft sealed side, 9.0 cu ft ported side, 180 sq in port area, 8 in port length
Displacement
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Depth
14.05 in
Outside diameter
18.46 in
Cut-out
16.68 in
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