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RE Audio SXX15D4

1000W 15" SXX Series Dual 4 ohm Subwoofer

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List price $689.99

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RE Audio SXX Subwoofers

RE Audio raises the bar for high output with the SXX 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 SXX 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:
  • 15" Dual 4 ohm SXX Series Car Subwoofer
  • Power Handling:
    • RMS: 1000 watts
  • Impedance: Dual 4 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 2 ohm: RE Audio SXX15D2
  • Proudly made in the USA
  • Also found as: sxx 15, sxx15, sxx 15d4, sxx-15, sxx-15d4
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty
SXX 15" T/S Parameters:
  • Electrical Q Value (Qes): 0.38
  • Mechanical Q Value (Qms): 4.7
  • Total Speaker Q Value (Qts): 0.38
  • Free Air Resonance (Fs): 27.8 Hz
  • Equivalent Compliance (Vas): 126.3 liters
  • One-Way, Linear Excursion (Xmax): 22 mm
  • Efficiency (SPL 1W/1m): 90.4 dB SPL
  • Effective Piston Area (Sd): 810 cm2
  • 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

Product History:

RE Audio SXXv215D4 thumbnail
(newest, current model)
RE Audio SXX15D4 thumbnail
(previous model, replaced by RE Audio SXXv2-15D4)

Subwoofer Specifications

Subwoofer Series
Each subwoofer manufactured is part of a series. This is the name of the subwoofer's series.
SXX (RE Audio)
Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
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.
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.
4 ohms
Voice Coil Diameter
Diameter of voice coil, usually measured in inches.
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".
90.4 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.
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.
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.

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.
3.0 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.
4.0 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.
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.
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.


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.
27.8 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.
126.3 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.
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.
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.
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

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


Enfield CT

Almost made this girl puke!

February 28, 2011

I have 2 wired to down to one ohm on a Rockford T2000.1bd and omg its crazzzy. This girl was in my car and i was slapping some Jeezy and she turns it down and goes "I think I'm going to puke" lol. I was so happy to hear her say that lol.

11 of 14 found this helpful

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ashland ky

made her go def

March 21, 2011

I'm not sure if i have tha d2 or d4 but i had 2 of them in my cadillac and they was beast but i recently got a 84 box caprice and i squeezed them in tha trunk with a 5500 watt power acoustic amp and yesterday me and my girlfriend was riding listening to gucci mane and she turned it down and said she couldnt hear and her head and brain was kinda hurting and the amp is only a quarter way up with subs wired at 2 ohms the only problem i have now is to figure out how to keep trunk from banging off i would recommend these subs to and bass head but on sxx and higher none of tha cheapos

11 of 15 found this helpful

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Grand Rapids,MI

Great Subs!!

July 26, 2012

I bought 2 of these and am running them in a ported box. All I can say is WOW!! these subs flat hammer! i am driving them with a PPI S2000d and the subs have no issue at all taking everything the amp can throw at them..
Incredible sound quality and VERY loud!! My only real complaint is the fact this series of sub cant be run in a sealed box. Other than that, the finest subs i have ever owned!!

9 of 14 found this helpful

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Sonically Clean

November 29, 2011

Very nice sub plays all notes all the way down to the cello.

7 of 11 found this helpful

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Avondale, Arizona

RE the ultimate sub

October 20, 2011

Best sub I have ever owned. Once you go RE you won't go back to anything else!

6 of 9 found this helpful

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Decatur, AL

beast of a sub

September 3, 2010

Got two of these with a bzr2100 hifonics amp. let me just tell ya, loud,clear,smooth bass. Personally would take these over 2 l7 15s i love kicker been around them my whole life, seen kicker subs go thru hell and still bang, but if you want clear bass go with these. These subs WILL NOT let ya down, plus l7s 15 dont compare to these took a chance by getting them because im a kicker guy but boy was i happy with my decision. GET EM

7 of 11 found this helpful

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Dothan, AL

Better than L7

February 16, 2011

These subs are true beasts. I purchased 2 of them about 3 months ago. I bought a custom box for them and MANE do these subs really breath. Best pair of subs I ever owned, and I shop for nothing but the best. These subs will blast Kicker L7 to sleep. I am powering them with a hifonics brutus 2400.

8 of 14 found this helpful

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Murphysboro, IL

147.36 on term lab!?

June 13, 2012

This sub is just flat out amazing. It will handle about anything you can throw at it. I have it in a 4.5 cubic foot box tuned to 35hz and i pulled a 147.36 on term lab on the windshield. For only a 1000RMS that is crazy. You won't get a better deal. The lows are the same as an 18" GET THIS SUB!!

6 of 12 found this helpful

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Fairfax, VA

best sub for cheap price

December 31, 2011

Thank you SonicElectronix i got just 1 sub wired at 2 ohms just barely putting out 900 watts RMS. It hits so hard i gotta lower the bass very low. It has no smell to it even though I play it hard for 3 hours or more on my trips. RE is the best quality too the only warning if you buy dont play it too loud or you will lose hearing in a day lol. I recomend this sub.

4 of 8 found this helpful

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Hoover, AL

First 15" sub

October 30, 2011

I've been playing around with 10" kicker L7s, alpine type r's, and other 10" subs trying to fit as many into my little chevy cobalt coupe as I could, finally getting my number up to 5. Mostly for display, but 5 subs in a small car like that beats hard as hell.
So one day I changed my mind and said I was done with that and picked up one of these 15" SXX subs just to see how one would sound before buying two or three more. I got it fit into a ported 4 cubic foot box, and it wouldn't fit in my trunk, so it's in my backseat now pointing forward. Done with 10s for life, got this thing hooked up to a 1500.1 Autotek SS amp, just pushing it at 750w on 2 ohms, it beats me to death.
I may get another and build a box to put in my trunk if I'm feeling like going deaf before 30, but as of right now I'd recommend this sub to anyone who is looking for a whole lot of bass without going for an Fi BTL and busting their wallet wide open.
Only complaints are really the scent it puts out when you're running it wide open, it's a distinct odor that I can't place my finger on, its cooling system is a little weaker that most subs in this range, so you can't keep it at maximum for too long, and that its output in a sealed box is terrible compared to ported, because I wanted to stuff it in a sealed box so I could fiberglass a custom fitted box, but again, it just didn't impress me at all.

5 of 10 found this helpful

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Orlando, FL

Amazing Product!

July 5, 2011

RE is absolutely amazing. I currently have two of these wired down to 1 ohm on a 2400 RMS Hifonics amp, and they take it with ease. I would recommend these subs for anyone who is looking for an extremely loud daily driver, or even as entry level competition subs.

5 of 11 found this helpful

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September 24, 2012

I have 4 of these on two xtx ©5000.1 walled off in a jetta.

4 of 11 found this helpful

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Irish Pride


Great Subwoofer!!!

April 15, 2014

I'v read many mixed reviews on RE Audios subwoofers including their SXX line. Many people have seen problems such as the sub blowing or just stopped working. I bought this sub because my cousin recommended it to me after he won a few competitions with his, so i decided to buy it. Turns out to be one of the best subs iv seen! Most my friends thought it was going to be bad because it only costed $250 (their used to paying JL prices haha) after they listend to it they thought it was a steal of a deal for the price. Only downside to this sub is the box i have it in which defiantly could be better. In all this is an amazing sub and would suggest it to anyone who's looking at it. Iv got a 1600w hifonics brutus pushing it @ 2ohms @ 1200w and the thing hits like a beast even though i havent turned up my deck past 20 since im still breaking it in.

4 of 12 found this helpful

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re sxx 15

September 5, 2011

Bad a## sub sounds really good think im gonna get the xxx 15.

5 of 15 found this helpful

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Accessory Tools and Products

Accessories added

NVX 20 ft. of True Spec 8 Gauge Speaker Wire

Flexible multi-strand cable bends and twists to meet your installation needs.

Your Price $49.99

25 ft. of Streetwires 12 Gauge Speaker Cable

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

Your Price $44.95

Belva 23 ft. of 12 Gauge Speaker Wire

Ultra-flexible PVC blended jacket for easy installation.

Your Price $14.99

40 Square Feet of Sound Dampening Material

Thicker than the competition, complete sound damping kit for entire vehicle! Use for trunk, doors, roof and floor.

Your Price $119.99

Dynamat Sound Dampening Bulk Kit

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

Your Price $159.99

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

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

Car Stereo and Speaker Installation Tool Kit

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

Your Price $16.99

Xscorpion 9-Piece Nylon Plastic Pry and Chisel Tool Set

Easily removes dash/trims, door clips, panels and pins, rubber grommets and vehicle emblems.

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

1mm All Purpose Solder

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

Your Price $8.99

15" Protective Waffle Metal Subwoofer Grille

Keep your subwoofer looking amazing while keeping it safe with its durable metal construction!

Your Price $6.99

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

1 RE Audio SXX15D4 Subwoofer

Mono Amp

2 Channel Amp - Bridged

2 RE Audio SXX15D4 Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

3 RE Audio SXX15D4 Subwoofers

Mono Amp

4 Channel Amp

4 RE Audio SXX15D4 Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

Browse 4 questions and 6 answers
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Why did you choose this?
Sonic Electronix Store
i already have one and they are very nice and very good quality
Zach S on Mar 27, 2015
Sub that I originaly wanted ran out, this one seemed like the next best thing.
Samuel V on Feb 5, 2015
I have a car that a 3.0 cubic box would not fit in. What would happen if I used a 1.9 cubic foot sealed enclosure instead?
Jon d on Aug 9, 2014
Best Answer: Get a smaller sub, the sxx optimal performance comes out if a 3.0 ported enclosure, anything other that that won't do any justice
Reply · Report · Keevan A on Aug 11, 2014
· Add Answer · I Have This Question Too (2)
I Really want to buy this sub but I want to put them in a sealed box 2.0 ft per chamber. I notice it says not recommend for sealed why? What would happened if I put them in sealed box will they still sound great...
A shopper on Nov 20, 2014
Best Answer: Basicly its not compliant with a sealed box meaning that it dosnt like it. Because of one of the Q factors (i forgot which one) if you were to put this sub in a sealed box it would be super inefficient causing a massive draw off of you amp. Also the excursion would be very minimal. I got one in a 4cu ft box in the back of my 98 grand cherokee powerd by a jbl gto 1001 ez and that thing THUMPS!!
Reply · Report · Jake M on Nov 21, 2014
· Add Answer · I Have This Question Too (0)
I have the Hifonics Brz 2100 and I'm trying to determine which subs to purchase. My choices of 15 inch dual 4's subs are the Re Audio SXX, Earthquake Magma 15x or Massive Audio Hippo 154, which would you suggest for spl and sound qualilty? The most important factor is sound quality.
Kevin S on Aug 12, 2014
Best Answer: Hello,

The RE Audio SXX15D4 would be our choice, hands down. Not to take anything away from your other options, but this sub really got it right when balancing SQ vs SPL!
Reply · Report · Customer SStaff on Aug 13, 2014
· Add Answer · I Have This Question Too (0)

Product Summary


Model Number






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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 SXX15D4

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