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RE Audio SX18D2

1000W 18" SX Series Dual 2 ohm Subwoofer

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List price $824.99

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$289.99

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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 SX Subwoofers series is certainly one subwoofer manufactured with hi-fidelity audio in mind.

Subwoofer Features:
  • 18" Dual 2 ohm SX Series Car Subwoofer
  • Power Handling:
    • RMS: 1000 watts
  • Impedance: Dual 2 ohm
  • Dual composite 2-piece cone
  • Rubatek foam surround
  • FEA Optimized motor structure
  • Progressive spiders
  • Wrap around rubber gasket
  • Tork-Tite terminals
  • 3" 8-Layer voice coil
  • Cast aluminum basket
  • Triple stacked magnets
  • Designed specifically for ported/vented enclosures
  • Also available in a Dual 4 ohm: RE Audio SX18D4
  • Proudly made in the USA
  • Also found as: sx 18, sx18, sx 18d2, sx-18, sx-18d2
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty
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 cm2
  • DC Resistance (Re): 1.9 ohm
  • Nominal Impedance (Znom): Dual 2 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 Series
Each subwoofer manufactured is part of a series. This is the name of the subwoofer's series.
SX (RE Audio)
Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
18"
RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
1000 watts
Voice Coil(s)
Dual voice coil subs have more wiring flexibility than single voice coils subs; however, single voice coil subwoofers provide easier hookup options for wiring multiple subwoofers in parallel or series. You may also run a dual voice coil (DVC) sub in parallel, series, or combination. A quad voice coil has four voice coils and is equal to two dual voice coil subwoofers as far as wiring goes.
Dual
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
2 ohms
Voice Coil Diameter
Diameter of voice coil, usually measured in inches.
3"
Sensitivity
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
 
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
92.7 dB
Xmax (millimeters)
Typically measured in millimeters, the Xmax value is the measure of a speaker cone's maximum excursion in one direction while maintaining a linear behavior.
22 mm
Subwoofer Design
This is the design of the subwoofer or the opening of the subwoofer enclosure. Each design has it's own benefits, whether it is a square, circle, or oval.

Round/Circle: This is the typical and common subwoofer design. They have a round cone and are a circle in design.

Square: These woofers are able to achieve a greater cone area in a smaller space. Because of the greater surface area, some square subwoofers will be louder than a round subwoofer of the same size.

Round / Circle
Main Cone Color
This is the color of the speaker's or subwoofer's cone.
Black
Woofer Composition
Lightweight woofer cone materials are essential for efficient operation. Poly cones produce exceptional sound and are sturdy against various changes in temperature. Paper cones are very efficient, and when treated for moisture resistance, will perform at a high level. Poly refers to polypropylene, which is thermoplastic or fibers that are polymers of propylene. IMPP refers to injection molded polypropylene, a commonly used process and material in speakers.
Dual Composite 2-Piece Cone
Woofer Surround
A speakers surround is part of the suspension system. The surround protects the cone and prevents it from being displaced as it flexes out from the basket. It is usually made of a durable material like treated foam or rubber in order to withstand the strenuous job of producing bass frequencies.
Rubatek Foam
Magnet Structure
Defines the overall structure of the subwoofers magnet.
Triple Stacked
Subwoofer Grille
Most subwoofers are able to accommodate a universal grille; however, some subs include a grille and others have a specific, optional grille available for purchase separately. If "yes", then the subwoofer includes a grille. If "optional (sold separately)" the matching grille will need to be purchased in addition to the sub.
No
Re-Cone Kit Available
Some higher end subwoofers have replaceable cone assemblies. In case of a blown woofer, a recone kit allows for a simple replacement, as opposed to purchasing an entire new subwoofer.
No

Recommended Enclosure Specifications

Recommended Enclosure Type
This is the recommended type of enclosure that the subwoofer should be installed into. Some subwoofers are specially designed for particular enclosures.

Sealed: These enclosures completely enclose the air inside the box. These boxes produce a tight bass.

Ported/Vented: These enclosures have a slot of air to escape from the box. The result is a sound that has more "boom".

Bandpass: These are a combination of both sealed and ported enclosures. They can be very efficient, but require tuning for the best response.

Ported / Vented
Optimum Sealed Box Volume
This value indicates the ideal sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
Minimum Ported Box Volume
This value indicates the minimum ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
5.5 cubic feet
Optimum Ported Box Volume
This value indicates the ideal ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
Maximum Ported Box Volume
This value indicates the maximum ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
8.0 cubic feet
Top-Mount Depth
The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
9-1/2"
Cutout Diameter
The actual diameter of the hole you will need to cut out if you are creating a new mounting location for this speaker, or if you are mounting a subwoofer in a box.
16-3/4"
Shallow Mount Installation
This means that the subwoofer/speaker is designed to be installed in areas that do not have a lot of space. Shallow mount subwoofers are typically found under a seat or behind the seat in some trucks.

Shallow mount speakers will typically have a mounting depth of 2" or less, while shallow mount subwoofers will typically have a mounting depth of 3" or less.

No

Electromechanical Parameters

Free-Air Resonance (Fs)
The free-air resonance frequency of the subwoofer, measured in Hz. At this frequency the weight of the moving parts is perfectly balanced with the subwoofers suspension system.
0.53 Hz
Equivalent Compliance (Vas)
This is the amount of air that has the same stiffness as the subwoofers suspension. The greater the rating, the lower the stiffness and larger recommended enclosure. It is measured in Liters.
159 liters
Total Speaker Q Value (Qts)
This is the subwoofers relative damping (Q) at the resonance frequency (Fs), including all dimensionless losses. Essentially, a high Qts value (closer to 1.0) means the subwoofer is great for sealed enclosures and a low Qts value (closer to 0) means the woofer is great in vented enclosures. A Qts of around 0.45 means the woofer will work decently in either enclosure type.
0.48
Electrical Q Value (Qes)
The subwoofers relative damping (Q) at the resonance frequency (Fs), including electrical losses. Also called the mechanical damping of the subwoofer. The unitless measurement usually varies from 0.5 – 10.
0.53
Electrical Resistance of Voice Coil (Re)
Amount of DC resistance of the subwoofer when measured with an ohm meter. Typically, this will read less than the impedance rating of the subwoofer.
1.9 ohms
Mechanical Q Value (Qms)
This is the subwoofers relative damping (Q) at the resonance frequency (Fs), including mechanical losses. Also called the mechanical damping of the subwoofer. This unitless measurement usually varies from 0.5 – 10.
6.1
Efficiency Bandwidth Product (EBP)
This number represents the trade off between having an efficient woofer and one with a wide bandwidth. To calculate this number, take the Fs and divide it by the Qes. If the number is below 50, the woofer is designed for a sealed enclosure only. If it's between 50-100 it can be used in either. Lastly, if it's greater than 100 it's designed for vented enclosures.

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
74%
4 Star
21%
3 Star
5%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.8
Value
4.7
Features
4.7
Design
4.8
Usability
4.8
BREWSKI

Union,MO

Overall
Durability
Value
Features
Design
Usability
def buy

August 1, 2010

i have one in my 2000 jeep grand Cherokee and the thing shakes my side mirrors so bad that i cant see the cars behind me when the bass hits. i give it a 10... a must buy.

4 of 4 found this helpful

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Cam

Aurora, CO

Overall
Durability
Value
Features
Design
Usability
Re Audio Sx 18 D2!

December 18, 2014

I took a risk at buying this brand new sub! Let me tell you!
This sub gets down! The lows are incredible, the sub design looks rich lol.
Only had the sub for about a week, Still worried?

if your in the market for something other then 12's, 10's, or 15's.
You can't go wrong with these 18's. Obviously they can get higher in price, but these do the job without spending a house payment.
Most def recommend these subs if you want not to loud but clean low bass.:) Now it can get sloppy cause it is a 18, but who cares your buying it for that FLEX!

0 of 0 found this helpful

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D

Lake B MN

Overall
Durability
Value
Features
Design
Usability
RE Audio SX18D2

November 5, 2014

The only thing I could say when I got this thing in the mail, is Wow.
The box it arrives in is a wooden crate, so no worries on it coming broken.
Straight out of the box the surround is rock solid, so it will take plenty of time before she can actually move quite a bit. She does warm up rather quickly though.

0 of 0 found this helpful

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Michael

Sonora, CA

Overall
Durability
Value
Features
Design
Usability
Slapin

October 5, 2014

PROS:hits lows very good. Shakes store windows from 30 feet away. ONLY CON: got me a ticket haha

0 of 0 found this helpful

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Todd

Prince George, VA

Overall
Durability
Value
Features
Design
Usability
GREAT VALUE, GREAT SOUND

March 2, 2014

Be prepared to buy a new windshield. Great sub. With the right amp and box you'll be loosing your ears. So if you dont want to pay for ear surgery or pay for new windshield don't buy! My grandma had heart palpitations when I took her to the store. Ended up having to take her to the ER. Great site great sub great customer service.

0 of 0 found this helpful

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Zack

leitchfield, KY

Overall
Durability
Value
Features
Design
Usability
Re sx 18

February 3, 2014

I have 2 of these in a 95 chevy lumina in a 15 cf box tuned to 32 hz on 2000 watts rms ( it sucked getting the box in ) and they are ok loud I got them before the price was jacked up 100 dollars so I got a good deal

0 of 0 found this helpful

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Don

Reno, NV

Overall
Durability
Value
Features
Design
Usability
This sub is CRA CRA

December 8, 2013

when I received this sub it comes packaged in a wooden crate......I knew it was gonna be BA....I made a 8 cu box with 8 in flared port and the ladies LOVE it......WIN

0 of 0 found this helpful

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Shotgun

Manvel, TX

Overall
Durability
Value
Features
Design
Usability
THUMPING!

September 17, 2013

I have had several 18" subs from different manufacturers all running 1250 watts rms @ 2 ohms and this sub hits much harder than any sub I have owned. I could recommend this sub to anybody looking for high performance at a great price. Don't settle with a crappy sub buy RE Audio the first time. Shipped in a plywood frame to keep it safe during shipping which was a shock to see a company give the extra effort. LOVE THIS SUB.

0 of 0 found this helpful

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RPBC

Rockwall, Tx

Overall
Durability
Value
Features
Design
Usability
Impressive and Wow's everyone.

July 14, 2013

I got this is an 14 x 27 x 27 inch box 6 cubic feet with a massive port, it booms. i expected more but im using a 1500.1 db drive amp now about to get a 4000 watt power acoustik amp and hope its better. but overall its amazing on the lows!

0 of 0 found this helpful

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CADILLAC

Round Rock, TX

Overall
Durability
Value
Features
Design
Usability
RE AUDIO SX18D2

July 5, 2013

I ordered a pair of these and i hope i get them soon, i cant wait to build a box for them. Ive seen some on youtube and theyre loud! im goin to put them in my 2000 cadillac deville

0 of 0 found this helpful

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FlyinRyan37

forney, TX

Overall
Durability
Value
Features
Design
Usability
Great value!!!

January 21, 2013

it very good price for what you get and you can recone it to a FI BTL and swap the motor for a RE FD 18 and i have it going in my Ford Ranger 4000 watts

0 of 0 found this helpful

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mike

palestine,texas

Overall
Durability
Value
Features
Design
Usability
re audio sx 18 d2

September 27, 2012

This sub is good loud in the right size box
but not a competition speaker it simply doesn't have loudness like fi or dc audio has. Good for the money.

0 of 0 found this helpful

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kristie

mill hall, PA

Overall
Durability
Value
Features
Design
Usability
18''sx Re subwoofer

May 16, 2012

I just got one RE Audio SX18 one an RE Audio 4000watt amp and let me tell you it pounds so hard it makes the stuff in my house fall off the walls overall I like it .

0 of 0 found this helpful

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Robert

Villas, NJ

Overall
Durability
Value
Features
Design
Usability
This thing gets down!

April 23, 2012

Needless to say this is strictly an spl sub. I have it in a fiberglassed 6.5 cu ft box tuned to 33 hz and this thing gets nasty low. In my explorer it peaks at around 45 hz, but itll play down to 25 hz smoothly. Now that I'm running enough wattage and no longer clipping the sub sounds perfect, and got much louder. And its only being pushed with around 800 watts rms! Enough to flex my roof, windshield, windows, doors, but not enough to be doing hair tricks and what not. Maybe its because its in an suv, but in anything smaller it would be death. Overall great buy! FYI this is my second one, the first one blew. Still havent determined the cause but Sonic replaced it. You guys are the best 5/5!

0 of 0 found this helpful

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jocelyn

silver city, NM

Overall
Durability
Value
Features
Design
Usability
Better than I thought

March 6, 2012

A friend owed me money so he gave me this sx18 brand new and a 6cu ft ported and I put it on a hifonics amp pushin 1200rms in my 94 suburban. It makes me breathe like crap. It was more than I expected from this sub and the sound quality is awsome from zz top. To oldies to hard hitting rap I REALLY recomend ths sub or any RE subs. The reviews speak for them selves and Sonic is the best site to buy from.

0 of 0 found this helpful

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Christopher Jones

Philippines

Overall
Durability
Value
Features
Design
Usability
RE SX18D2 x2

August 14, 2011

I Have x2 of this RE 18 Inches 2 Ohms installed in my MPV. It really rattle my whole car especially the Roof & my rearview mirror all the way shaking. I Drive my x2 RE 18D2 by Hifonics BRZ2400. I Really recommend to those Car Audio Fanatics this RE 18D2. Pounding bass....

0 of 0 found this helpful

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Andy

Sin City

Overall
Durability
Value
Features
Design
Usability
"You will not be disappointed."

June 15, 2011

I have a pair of RE AUDIO SX18's each powered by a HIFONICS BRZ2100.1D @ 1ohm. It hits them lows LOUD and CLEAR.

0 of 0 found this helpful

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Michael

Harrisonburg, VA

Overall
Durability
Value
Features
Design
Usability
Enjoyable affordable 18 inch sub

June 10, 2011

I purchased this sub as a swap out toy in my wifes Van on limited occations. I will pop out her 10" JLW7 sub box, and swap this one in to hit the town. The sub does what it does best, and thats create a smile ear to ear on your face. We are tapping this sub with a Rockford 2500, which is overkill, and needless to say, I blew it in less than a month. I then decided to purchase 2 RE, 18" subs to even out the power.. This combination has performed flawlessly and great for a swap out sub box. I would definitely purchase this sub if your in this budget range.

0 of 0 found this helpful

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Gary

Beaver, WA

Overall
Durability
Value
Features
Design
Usability
AMAZING!

January 20, 2011

This sub is my first 18 and all I can say is WOW. Its really loud and the sound quality is good. Just make sure you put it in a proper box, and by proper I mean large. Really, the only bad thing about buying this awesome sub from Sonic is the 7-14 days to get it shipped. I believe this is because Sonic is direct with RE Audio and they are manufactured for each order.

0 of 2 found this helpful

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Accessory Tools and Products

Accessories added

25 ft. of Streetwires 12 Gauge Speaker Cable

You'll need speaker wire to hook up that new subwoofer!

Your Price $44.95

Dynamat Sound Dampening Bulk Kit

Did you know sound dampening will reduce those annoying rattles and even increase your SPL?

Your Price $159.95

Stinger Sound Dampening Bulk Kit

Stinger's Roadkill sound dampening series is sure to kill unwanted road noise and rattles! Enough sound dampening for the whole car!

Your Price $99.99

12 oz. Can of Adhesive Spray

Spray adhesive used for adhering carpet to subwoofer boxes without bubbles.

Your Price $6.99

40" x 15 Ft Piece of Premium Un-Backed Automotive Trim Carpet

Durable design for long life-span, available in many colors and shades.

Your Price $39.99

Gold Plated Dual Terminal Banana Plug Connector

Enables an expandable, secure connection accepting up to 8 gauge wire.

Your Price $1.99

Car Stereo and Speaker Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $14.99

Cordless Multi-Functional Heat Tool Soldering Iron Kit

Continuous working lock allows you to work without holding down trigger.

Your Price $79.99

4 Ft of 1/4" Thick Black Heat Shrink Tubing

Provides abrasion resistance and added protection for your cables.

Your Price $3.99

2" Universal, Professional Heavy Duty Roller for Sound Damping/Dampening

Universal rubber roller to make it easy to install sound dampening.

Your Price $7.99

1mm All Purpose Solder

Solder is all purpose for use on most projects where solder is needed.

Your Price $8.99

Scosche SPL Meter

Monitor the noise level of your new car audio system with this SPL meter measuring from 60-135 dB.

Your Price $21.99

Impedance Meter / Signal Generator

Easy to locate tuning frequencies of passive radiators and ported enclosures

Your Price $299.99

1 RE Audio SX18D2 Subwoofer

Mono Amp

Mono Amp - Option 1

2 Channel Amp - Bridged

2 RE Audio SX18D2 Subwoofers

Mono Amp

2 Channel Amp

4 Channel Amp - Bridged

3 RE Audio SX18D2 Subwoofers

Mono Amp

Mono Amp - Option 1

4 Channel Amp

4 RE Audio SX18D2 Subwoofers

2 Channel Amp

4 Channel Amp

Browse 1 question and 3 answers
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Why did you choose this?
Sonic Electronix Store
Great price and design
Lynne R on Sep 5, 2014
want bassss lol
Brandon G on Aug 7, 2014
go big or go home
Michael M on Aug 31, 2014

Product Summary

Manufacturer

Model Number

SX18D2

Weight

41.65lbs

Internal SKU

sx18d2

Internal Product ID

27322

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: RE Audio SX18D2