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Single 18" 1,200 Watt SDR Series Loaded Vented Subwoofer Enclosure


Skar Audio engineered the SDR-1X18D2 single 18-inch loaded vented subwoofer enclosure as a simplified option to add a competition-grade subwoofer system, without the guesswork involved in designing it from scratch. This loaded enclosure features one of our massive SDR-18 D2 1,200 watt max power 18-inch subwoofers, which arrives pre-loaded and wired up inside of the custom single 18" vented enclosure. The enclosure features a unique kerf port design, allowing for extreme levels of bass output. Furthermore, the enclosure is finished in premium grade black carpet for a sleek appearance and features the Skar Audio logo in white on the top surface of the box.


This enclosure was engineered by Skar Audio specifically for the subwoofer that is loaded in it, ensuring perfect sound and compatibility. Every subwoofer is different, and it is so critical when buying a subwoofer to ensure that the subwoofer and enclosure are an ideal match, or you will lose sound quality and output. With this loaded subwoofer enclosure model, all of those concerns are eliminated, making it easier than ever to add powerful aftermarket bass to your vehicle.


The subwoofer comes pre-wired and loaded inside of the enclosure allowing for an easy and hassle free installation. The dual 2-ohm subwoofer is wired up inside of the enclosure so that the final impedance load is configured for 1-ohm at the terminals. Peak Power: 1,200 Watts, RMS Power: 600 Watts.

Subwoofer Specifications

  • Skar Audio SDR-18 D2 - 18" Component Car Subwoofer
  • Dual 2 Ohm Voice Coil Configuration
  • Peak Power: 1,200 Watts
  • RMS Power: 600 Watts
  • Competition Grade Pressed Paper Cone
  • High Roll Foam Surround
  • Advanced Air Flow Cooling System
  • 2.5" High Temperature Copper Voice Coil
  • Motor Weight: 97 oz
  • Frequency Response: 18 Hz - 250 Hz
  • Sensitivity: 87.3 dB
  • Fs: 24 Hz
  • Re: 1.9 Ohms
  • Qms: 4.68
  • Qes: 0.80
  • Qts: 0.69
  • Nref: 0.33%
  • Mms: 413 gr
  • Cms: 0.107 mm/N
  • Bl: 17.11 n/a
  • Vas: 206 L
  • Sd: 1164.1 cm²
  • Xmax: 13.5 mm one-way

Enclosure Specifications

  • Single 18-Inch Vented (Ported) Subwoofer Enclosure
  • Custom Engineered Skar Audio Enclosure specifically Designed for use with the Skar Audio SDR-18 D2 18-inch Subwoofer
  • "Wedge" Style Enclosure with Vented Design allows for Extreme Low End Bass Output Levels and Responsiveness
  • Wood Thickness & Material: 5/8" MDF
  • Front Baffle Thickness: 1.25"
  • (Double Baffle - Countersunk Design for a Smooth, Flush, Subwoofer Appearance)
  • Finish: Black Colored Carpet with Skar Audio logo in White on Top of Enclosure
  • Premium Push Spring-Loaded Terminals
  • Internal Air Space of Enclosure: 4.75 ft³
  • Tuning Frequency of Enclosure: 30 Hz
  • Actual Enclosure Outer Dimensions:
  • Width: 25.75"
  • Depth #1: 19.75" (Top Depth)
  • Depth #2: 23.50" (Bottom Depth) 
  • Height: 21.50"
  • Port Measurements: 2.5" x 19.625" x 25.5"

Customer Reviews

Based on 8 reviews
18 inch sdr

Love the sub hits hard sounds great I do need a stronger amp and I will be purchasing the skar rp1200.1 within the week looking forward to using more of skar products over the future


Amazing subwoofer and enclosure for the price I’ve had mine for about two weeks now on a rp1500 in a full size Escalade all stock electrical and it hits a 145.8 i love it but selling it and moving on to better things but we’ll work the the budget and would be great for a daily setup


Sub lasted 10 mins on 2k rms. Bummer but owel, ordered a 2nd one. Shit was real loud tho. waiting for 2nd 1 to come in. User error, great product otherwise


Single 18" 1,200 Watt SDR Series Loaded Vented Subwoofer Enclosure

Worth it

If you are in the market for a budget 18.....buy it! This sub and box combination excels at what it was designed for. Is it the best sounding 18 on the market? No of course not but for the price, it’s hard to beat in its class.

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