Open Box, Great - Sundown Audio SW-MD18D1 18" M Series Dual 1-ohm Subwoofer (Open Box, Great)

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Product highlights

• 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

Learn more about the m18d1_obg

Description

Authorized dealer

Item Condition - Open Box, Great:

This product works like new, is well-cared-for and in great condition. May show limited signs of wear or use and may be missing non-essential parts, accessories or original packaging.

Sundown Audio M-18 D1 18" (M18D1)

4000W Peak (2000W RMS) 18" M Series Dual 1-ohm Car Subwoofer (SW-M18D1)
Quantity: 1

Product Details:

18" Dual 1 ohm M Series Subwoofer
Power Handling:

Peak: 4000 watts
RMS: 2000 watts

Polypropylene Cone
High Roll Foam Surround
Laser-etched all black backplate design
Custom tooled and patented mega roll frames
Built for intense bass with stellar low-frequency performance
Special M-series magnet boot design
Features a hyper-extended pole and extreme clearances
3" High Temperature Aluminum Voice coil
4-layer round wire voice coil on thick aluminum former
High-velocity pole vent and a heavily vented magnetic gap
Proprietary high-velocity cast-aluminum frame-base venting system
Proprietary Sundown PG linear suspension (fully computer optimized)
35 mm Xmax
Quad Stacked magnet motor structure
Bolt-through motor design to ensure maximum longevity
Resonance Frequency (Fs): 26.152 Hz
Sensitivity: 85.83 dB
Recommended ported box volume: 7.0 cubic feet
Top-mount depth: 14.05"
Cutout diameter: 16.68"
Authorized Internet Dealer
1-year Manufacturer's Warranty

Priced Individually

Specifications & Details

Subwoofer Specifications

Series

M Series

Subwoofer Size

18"

Peak Power Handling

4000 watts

RMS Power Handling

2000 watts

Voice Coil(s)

Dual

Impedance (Per Voice Coil)

1 ohm

Voice Coil Material

Copper

Sensitivity

85.836 dB

Xmax (millimeters)

35 mm

Subwoofer Design

Round / Circle

Main Cone Color

Black

Woofer Composition

Polypropylene

Woofer Surround

High Roll Foam

Magnet Structure

Quad Stacked

Subwoofer Grille

Re-Cone Kit Available

CTA-2031 Compliant

Recommended Enclosure Specifications

Recommended Enclosure Type

Ported / Vented

Optimum Ported Box Volume

7.0 cubic feet

Top-Mount Depth (Mounting Depth)

14.05"

Cutout Diameter

16.68"

Shallow Mount Installation

T/S Parameters (Electromechanical)

Free-Air Resonance (Fs)

26.152 Hz

Equivalent Compliance (Vas)

112.182 liters

Total Speaker Q Value (Qts)

0.684

Electrical Q Value (Qes)

0.782

Electrical Resistance of Voice Coil (Re)

2.12 ohm

Mechanical Q Value (Qms)

5.452

What is in the box?

WITB: Subwoofers

Subwoofer

Warranty and Return Policy

Parts Warranty Duration

1 year

Labor Warranty Duration

1 year

Warranty Provider

Manufacturer

Customer Ratings & Reviews

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By feature average rating

Durability		5
Value		5
Features		5
Design		5
Usability		5

Customer Photos & Videos

Customer Reviews

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Great sub

The following review is for SW-M18D1, which is a part of the bundle you are viewing.

Sub arrived next day, sounds amazing. Hits really hard, clear sound, easy to install, and reasonable pricing. Only complaint is they didn't send any stickers with it for my truck. ????

By Christy on August 24, 2025 Checkmark Icon

Verified purchase

1 found this helpful

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Sundown Audio M 18 D1

The following review is for SW-M18D1, which is a part of the bundle you are viewing.

subwoofer Sundown Audio M18 is simply a magnificent subwoofer. low frequencies play very deep and powerfully. I liked Sundown Audio m18 even more than sundown audio xv3 18.

By Stanislav on July 9, 2025

1 found this helpful

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Amazing subs and fast shipping, thank you Sonic!

The following review is for SW-M18D1, which is a part of the bundle you are viewing.

The build quality on these Sundown M series is excellent. It arrived in the Sundown box which was very well packaged with thick Styrofoam that adequately supports the subs weight.

By Charles on October 10, 2025 Checkmark Icon

Verified purchase

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