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RE Audio SX18D4

18" Dual 4 ohm SX Series Car Subwoofer

4.7

(6 reviews)

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RE Audio SX Subwoofers

RE Audio raises the bar for high output with the SX line of their competition grade, high excursion subwoofers. With an impressive power handling rating of 1000 Watts RMS – this subwoofer shows you it’s meant for those serious about quality bass.

Every single component of this subwoofer has been crafted with precision in mind to obtain full, impactful bass. From its 3” eight layer aluminum flat voice coil, to its triple stacked magnets this high powered subwoofer will output with fine clarity.

The entire SX line of subwoofers can handle an impressive 1000 watts of RMS continuous power, no matter the size! With its large Rubatek Foam surround and FEA optimized motor structure; this woofer can handle large amounts of power, while maintaining durability. The RE Audio SXX Subwoofers series is certainly one subwoofer manufactured with hi-fidelity audio in mind.

Subwoofer Features:
  • 18" Dual 4 ohm SX Series Car Subwoofer
  • Power Handling:
    • RMS: 1000 watts
  • Impedance: 4 ohm
  • Dual composite 2-piece cone
  • Rubbertek Foam Surround
  • Tork-Tite terminals
  • Cast aluminum basket
  • 3" 8-layer aluminum voice coil
  • Triple stack magnets
  • Hand-built in the USA
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty

Subwoofer Dimensions:

  • Mounting Depth: 9.5"
  • Mounting Hole Diameter: 16.75"
  • Overall Diameter: 18.5"
  • Bolt Hole Circle: 17.5"
  • Motor Width: 6.5"
  • Motor Depth: 3.25"
  • Basket Depth: 6.25"
  • Displacement: 0.22 cu. ft.
  • Weight: 28 lbs.
SX 18" T/S Parameters
  • Electrical Q Value -Qes: 0.53
  • Mechanical Q Value -Qms: 6.1
  • Total Speaker Q Value -Qts: 0.48
  • Free Air Resonance -Fs: 33.2 Hz
  • Equivalent Compliance -Vas: 159 liters
  • One-Way, Linear Excursion -Xmax: 22 mm
  • Efficiency -SPL 1W/1m: 92.7 dB SPL
  • Effective Piston Area -Sd: 1210 cm^2
  • DC Resistance -Re: 1.9 ohm
  • Nominal Impedance -Znom: Dual 4 ohm
  • Thermal Power Handling -Pe: 1000 W
  • Force Factor -Bl: 21

For more information on the Thiele and Small Parameters, visit our T/S Parameters Article

Subwoofer Specifications
Subwoofer SeriesSX
Subwoofer SizeN/A
Peak Power HandlingN/A
RMS Power Handling1000 watts
Voice Coil(s)Dual
Impedance (Per Voice Coil)4 ohms
Voice Coil Diameter3"
Frequency ResponseN/A
Sensitivity92.7 dB
Xmax (millimeters)22 mm
Subwoofer DesignRound / Circle
Main Cone ColorBlack
Woofer CompositionDual composite 2-piece cone
Woofer SurroundRubatek Foam
Magnet StructureTriple Stacked
Subwoofer GrilleNo
Re-Cone Kit AvailableNo
Recommended Enclosure Specifications
Recommended Enclosure TypePorted / Vented
Minimum Sealed Box VolumeN/A
Maximum Sealed Box VolumeN/A
Minimum Ported Box Volume5.5 cubic feet
Maximum Ported Box Volume8.0 cubic feet
Top-Mount Depth9-1/2"
Cutout Diameter16-3/4"
Shallow Mount InstallationNo
Electromechanical Parameters
Free-Air Resonance (FS)33.2 Hz
Electrical Resistance of Voice Coil (Re)1.9 ohms
Electrical Q Value (Qes)0.53
Mechanical Q Value (Qms)6.1
Total Speaker Q Value (Qts)0.48
Equivalent Compliance (Vas)159 liters
Warranty and Return Policy
Return Policy Standard Return Policy
Parts Warranty Duration1 year
Labor Warranty Duration1 year
Warranty ProviderManufacturer
Customer Review Summary for RE Audio SX18D4
Average Customer Rating is 4.7 out of 5 stars:
4.7
based on 6 Reviews
Share your thoughts with others:
Rating Distribution:
5 star:
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67%
4 star:
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33%
3 star:
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0%
2 star:
.
0%
1 star:
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0%
what's this?
Average Attributes Rating:
Durability
4.7
Value
5.0
Features
4.5
Design
4.3
Usability
4.8
what's this?
Most Helpful Customer Reviews:
January 31, 2012 A Monster
2 of 2 people found the following review helpful:
Review by
Cody from Portage, WI
Overall
Durability
Value
Features
Design
Usability
I got this thing shipped across the country in 6 days. It's way bigger in person. The spider is stiff as a board. Be sure to ease into flexing the thing at full tilt. I had it running free air on 2000 watts at 4 ohms. I couldn't push the cone up or down but apparently when 2000 watts of power is pushing it, it has an inch of excursion. It shook my truck more than my two orion 10's AND ITS NOT EVEN IN THE BOX YET.
I put it in a 10ft. cubed box sealed. When the low note hit on White Girl, all i could do is laugh and gasp for air. I went inside my restaurant because thats the only place i could test this thing without the cops being called. I could feel the bass on the counters! And the doors were shaking. I was around 15 feet away from the door at the time. I went home and on my way there i stopped at a red light. Obviously i turned it up to the Maxx and the trucks tailgate in front of me was rattling. I AM TRULY PLEASED WITH THE RUCKUS I CAN CAUSE WITH THIS THING.
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December 15, 2011 Great Subwoofer
1 of 1 people found the following review helpful:
Review by
Dexter from Houma, LA
Overall
Durability
Value
Features
Design
Usability
This thing is LOUD. Some people claimed that this subwoofer was only good for SPL and that it lacked sound quality. Well I'm nothing but impressed with this thing. I have it in a 1.2 cubic foot box tuned to 28 Hz in the back of a 20006 Expedition Limited. People are shocked when they hear how loud and low it gets.

Pros: Priced fairly, LOUD, DEEP, durable

Cons: Takes up a lot of room, things in my car are starting to break, (Specifically in my doors) Hearing loss.
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October 6, 2011 impressd
1 of 1 people found the following review helpful:
Review by
casper from faaborg, Denmark
Overall
Durability
Value
Features
Design
Usability
I bought this amazing shipping time, good quality!!!!!!
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May 31, 2011 GOOD 18? 4 the price$$$
1 of 1 people found the following review helpful:
Review by
DIExNxRAGE from BLACKHOLE,N.D.
Overall
Durability
Value
Features
Design
Usability
DEEP-LOUD-CLEAN-CHEAP= BUY IT NOW-MAKE ROOM WHAT YOU WAITING FOR HA! HA!
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April 23, 2012 Durable DD sub
Review by
James from Toledhoe, Ohiyo
Overall
Durability
Value
Features
Design
Usability
I am currently running 2 RE Audio SX18D4 subs off of an Audioque AQ3500.1D amplifier @ 1 ohm. The subs are rated at 1000 watts rms, and the amplifier puts out 4300 watts rms @ 1 ohm. Yeah these are that durable and under rated. I honestly didn't expect them to last very long at all. The truck has a 320 amp alt, 2 yellowtops, 4 runs of 0 ga, and 8ga wire to each sub so the amp is giving them hell, and they just slam and take it. I only smell the voice coils when it hits the low 15-25hz notes for long periods of time. With clean clip free power, these subs will play forever on around 1k watts. I had them on a Hifonics BRZ2400.1D and it could really only make one loud at a time. They have a sweet spot for longevity and sound at somewhere around 1500 watts rms.
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View All 6 Reviews for RE Audio SX18D4
Speaker Wire
Choose from our recommended speaker wire to hook up your amplifier to your new subwoofer. The higher quality of speaker wire that it used for this connection, the better your subwoofer will sound.
 ProductPriceAdd?
24.6 ft. of 10 AWG Monster Cable 400 Series Speaker Wire24.6 ft. of 10 AWG Monster Cable 400 Series Speaker Wire
For the ultimate connection, Monster uses a MultiTwist™ construction, a Magnetic Flux Tube, and even more cutting edge wire technology.
$50.00
15 ft. of 12 AWG StreetWires Speaker Wire15 ft. of 12 AWG StreetWires Speaker Wire
This SuperCable from StreetWires is a noise free link between your amplifier and your subwoofer.
$19.99
20 ft. of 12 AWG Kicker Speaker Wire20 ft. of 12 AWG Kicker Speaker Wire
Kicker uses twisted pair technology and hyper-flex cable to provide you with the cleanest sound and a simple installation.
$24.49
Sound Dampening Material
Get the most sound out of your new subwoofer with some high quality sound dampening material. It will keep the road noise out and the music inside the car.
 ProductPriceAdd?
Dynamat Rubber RollerDynamat Rubber Roller
Install your Dynamat with ease! This heavy duty rubber roller is designed specifically to install your Dynamat!
$18.99
Dynamat Extreme Bulk PackDynamat Extreme Bulk Pack
36 ft. Dynamat Xtreme Bulk Pack enhances the sound for your entire car!
$159.99
Bass Reconstruction Processors
These sound processors are perfect for enhancing the lower frequencies of a car audio system. After some installation and tuning, your new system will sound better than ever!
 ProductPriceAdd?
The Epicenter by AudioControl (Gray)The Epicenter by AudioControl (Gray)
The original bass booster expander with included remote will enhance the bass of your new system.
$149.99
Maxxsonics MX-3Maxxsonics MX-3
Enhances the bass response, increases linearity, buffers unwanted noise, and improves the frequency range of your subwoofer.
$64.95
Enclosure Accessories
These accessories are designed to help you build the custom enclosure that you have always wanted, or add to the box that you already bought. Either way, these products can assist you in achieving better sound, better looks, and more bass!
 ProductPriceAdd?
20 oz. Bag of Poly-Fil20 oz. Bag of Poly-Fil
Polyester fiber fiberfill adds better bass to your system.
$5.99
16 oz. Can of Adhesive Spray16 oz. Can of Adhesive Spray
Spray adhesive used for adhering carpet to subwoofer boxes without bubbles.
$5.99
Spring Post Terminal CupSpring Post Terminal Cup
Makes adding a spring post terminal to an enclosure simple! Banana clip ready!
$2.99
Binding Post Terminal CupBinding Post Terminal Cup
Use this to easily install a binding post terminal to your subwoofer enclosure.
$2.99
Banana Clip TerminalsBanana Clip Terminals
These high grade banana clips allow you to plug into your banana clip ready terminal for a secure connection.
$4.99
System Optimization and Tuning
Use these items to assist in testing and tuning your new car audio system to perfection!
 ProductPriceAdd?
AutoSound 2000 CD-101AutoSound 2000 CD-101
Low frequency test CD
$12.99
AutoSound 2000 CD-102AutoSound 2000 CD-102
High frequency test CD specifically designed for the set-up and evaluation of sound system imaging and placement.
$12.99
AutoSound 2000 CD-103AutoSound 2000 CD-103
Audiophile reference series test disc for evaluation of all audio components.
$12.99
Main Product
 ProductPriceAdd?
RE Audio SX18D4RE Audio SX18D4$369.95

For more information on wiring subwoofers, visit our Subwoofer Wiring Guide: Subwoofer Wiring Guide

Product Summary

Manufacturer: RE Audio
Model number: SX18D4
Weight: 42.00 lbs
Internal SKU: sx18d4
Internal product ID: 30162

Price Information

$824.99

–$455.04

$369.95

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I ordered an Alpine IDA-305S head unit. I waited for about a month since it was on back order. But it was totally worth the wait! Sonic was very helpful in keeping me up to date on my order. I love my new Alpine head unit! Goodbye cd's! I will definitely do business with Sonic Electronix again!

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