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Sundown Audio M-18 D1 18" (M18D1)

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

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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: 85.83 dB

Learn more about the m18d1
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List price $839.99
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$699.99

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Get a Free roll of Belva 16 Gauge Speaker Wire. Simply click the "Add Both to Cart" button and you will see your savings at checkout. This offer cannot be combined with any other coupons or offers.

Sundown Audio M-18 D1 18" (M18D1)

100% off


Priced separately $712 98

Promo Savings of $12 99

Total price:

$699 99

Description


Sundown Audio brand icon

Authorized dealer


Sundown Audio M-18 D1

The Sundown M-Series is an all-new "entry-level" subwoofer in Mega series - all Mega series subwoofers (10,12,15,18) feature custom tooled and patented frames (US Patent Numbers D691596, D691597, D691598, and D741841) and Mega-Roll surround. For the M-series, Sundown mate out Mega series frames to a quad stacked 200mm (7.87”) diameter motor structure with a total magnet stack height of 88mm (3.46”) featuring a hyper-extended pole and extreme clearances (allowing 59.5mm to mechanical bottom effectively making it bottomless - this is 4.68" peak-to-peak). Sundown always do things to the extreme so even "entry" level M-series features a full 20mm thick top-plate to finish the efficient magnetic circuit.


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


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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
Aluminum
Voice Coil Diameter
3"
Sensitivity
85.83 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
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

Item Details


Manufacturer:

Model Number:

SW-M18D1

Weight:

73.00lbs

Internal SKU:

m18d1

Internal Product ID:

206532

Customer Ratings & Reviews


Sundown Audio M-18 D1 18

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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Great sub

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


Sundown Audio M 18 D1

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


Amazing subs and fast shipping, thank you Sonic!

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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