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Sundown Audio MD18D1 (Open Box, Great)

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

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• 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
Was $839.99 Details
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$629.99

 with warranty

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FREE 2-day shipping to OH. Get it Thu, Nov. 20
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Open Box, Great

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Open box icon Brand new $699.99

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Description


Sundown Audio brand icon

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 MD18D1

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

Product Details:

  • 18" Dual 1 ohm M Series Subwoofer
  • Power Handling:
    • Peak: 4000 watts
    • RMS: 2000 watts
  • Polypropylene Cone
  • Mega High Roll Foam Surround
  • Mega roll frame construction
  • Etched all back backplate design
  • High Temperature Copper Voice coil
  • 35 mm Xmax
  • Quad Stacked magnet motor structure
  • Resonance Frequency (Fs): 26.152 Hz
  • Sensitivity: 85.836 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
No
Re-Cone Kit Available
No
CTA-2031 Compliant
No
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
No
Electromechanical Parameters
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

Item Details


Manufacturer:

Model Number:

M18D1_OBG

Weight:

73.00lbs

Internal SKU:

m18d1_obg

Internal Product ID:

224510

Customer Ratings & Reviews



5 star
100%
4 star
0%
3 star
0%
2 star
0%
1 star
0%



Durability
5
Value
5
Features
5
Design
5
Usability
5

Customer Photos & Videos


Customer Reviews

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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

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

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



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