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RE Audio XXX15D4

2000W 15" XXX Series Dual 4 ohm Subwoofer

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List price $1624.98

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Built for Brutality

You’ve stumbled upon RE Audio’s XXX Subwoofer. Don’t be afraid. This subwoofer is built for brutality, but capable of so much more. This subwoofer competes with any high output SPL based subwoofer, but is capable of outputting amazing sound quality as well.

RE Audio knew this subwoofer was meant for those serious about the bass in their vehicles, and manufactured this subwoofer accordingly. With such a gigantic magnet, a new venting system had to be engineered; this Vented Magnet System (or VMS) allows the subwoofer to output amazing levels of power without getting too hot.

RE Audio’s XXX Subwoofer may intimidate some, however after getting to know the XXX Subwoofer, it has a kind side as well. One part of the RE Audio XXX Subwoofer completely boasts pure, unrivaled power handling, engineered primarily for excess. Another side of the XXX may surprise some, the subwoofer also sounds extremely clean and tightly responsive. RE Audio XXX Subwoofers are proudly manufactured in the USA, RE Audio truly cares about fine crafting their flagship subwoofers.

Subwoofer Features:
  • 15" Dual 4 ohm XXX Series Car Subwoofer
  • Power Handling:
    • RMS: 2000 watts
  • Impedance: Dual 4 ohm
  • Kevlar reinforced kraft pulp, dual composite 2-piece cone
  • Rubber surround
  • Integrated tinsel leads
  • FEA Optimized motor structure
  • Dual progressive spiders
  • Integrated gasket
  • Tork-Tite terminals
  • 3" 4-Layer aluminum flat wire voice coil
  • Split coil design
  • VMS Vented magnet system
  • Cast aluminum basket
  • Triple stacked magnets
  • Designed specifically for sealed or ported enclosures
  • Proudly made in the USA
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty
XXX 15" T/S Parameters:
  • Electrical Q Value (Qes): 0.58
  • Mechanical Q Value (Qms): 3.62
  • Total Speaker Q Value (Qts): 0.501
  • Free Air Resonance (Fs): 19.10 Hz
  • Equivalent Compliance (Vas): 207 liters
  • One-Way, Linear Excursion (Xmax): 54 mm
  • Efficiency (SPL 1W/1m): 85.81 dB SPL
  • Effective Piston Area (Sd): 810 cm2
  • DC Resistance (Re): 4.2 ohm
  • Nominal Impedance (Znom): Dual 2 ohm
  • Thermal Power Handling (Pe): 2000 W
  • Force Factor (Bl): 18.16

Need the Perfect Subwoofer Enclosure?

Check out the RE Audio XXX15D4 Subwoofer Enclosure Guide

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

Product History:

RE Audio XXX15 V2D4 thumbnail
(newest, current model)
RE Audio XXX15D4 thumbnail
(previous model, replaced by RE Audio XXX15V2D4 (XXX15 V2D4))

Subwoofer Specifications

Subwoofer Series
Each subwoofer manufactured is part of a series. This is the name of the subwoofer's series.
XXX (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.
2000 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".
85.8 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.
54 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.
Kevlar reinforced kraft pulp, 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.
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
Minimum Sealed Box Volume
This value indicates the minimum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
1.6 cubic feet
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.
Maximum Sealed Box Volume
This value indicates the maximum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
2.1 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.
3.2 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.
19.1 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.
207 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.
4.2 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


El Paso, TX

Should i?

January 6, 2013

Thinking about buying one of these beasts for my civic because my 2 12" autoteks arent enough bass for me. Should i buy this one?

3 of 5 found this helpful

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jersey city, nj

re xxx

June 26, 2012

amazing sound. amazing bass. never heard anything like it. awesome. i bout two more since this purchase

4 of 7 found this helpful

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Tampa, FL

Extreme Audiophile w High Quality Taste - Read This

March 26, 2013

I owned the 05 Model Briefly , It was Equivalent to my two hifonics olympus xxv 2400 15"s and slightly deeper.. i was blown away but sold it because I liked the idea of two fifteens,. That being said , I got rid of the Navigator i owned and went to a coupe...remembered the xxx and began to drool over the new model. I received it and was ever so impressed with the sheer size of it. .. however , it wouldnt fit in my fourth order.. so i tore out a box that cost me 750 bucks to have built.. and built one from 1" thick mdf and 3/4" new zealand birch doubled up ( Tunes at 35hz). The baffle ( Speaker Hole Mount ) is 3" thick to be able to support the weight of the XXX 15" ( 84ish lbs.) Im currently Running the Single Re XXX at 2ohm on a Hifonics Colossus 3200rms @ 2 ohm .. with several kinetik batteries , and a high current alternator ( 270a Mechman) Audiotechnix 0 Ga. Fine Strand Copper And several 400amp fuses... off of the factory headunit in a 2008 Nissan Altima Coupe. If you want Loud , this is loud . If you want deep , This speaker murders low frequencies .. more so than the Orion HCCA 15"... If Youre After True Sound Quality , whether it be rock , rap , techno, or dubstep.. This Woofer keeps up with anything you throw at it... If you want pure SPL , It Delivers hands down. Im Running ONE and it sounds more clean and more impressive than most set ups ive seen running four 15" woofers... and definitely more impressive than the tahoe i saw with 38 8"s ... and 38 8"s is pretty impressive. Not a single uneducated individual believes that I house a Single 15". If you want Shock Value - This is the Woofer to grab People - Ive been doing Audio for some time now , and this product is by-far one of the most well built speakers out there (I called and talked to RE HQ and found that They actually hand-make each one and it takes about a week to do it - step by step - letting glue dry , adding spiders , etc etc) , DO NOT LET ANYONE TELL YOU OTHERWISE. Oh and FYI It handles much more than its recommended RMS. Im a true Audiophile and this woofer has satisfied my every desire. believe it. have a Great Day.
Tune it low - 30's or lower

3 of 6 found this helpful

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Philadelphia, PA

holy crap!!!!

December 27, 2012

i own one re sx 12 right now and i went to a DB competition a month or two ago and some guy had 2 of these in a mini van and it hit so hard i had trouble breathing, absolutely amazing the power!!

2 of 4 found this helpful

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Ann Arbor, Mi

Great Product

May 23, 2012

This speaker is definitely a powerful sub that delivers massive bass so if thats what you're looking for you might want to give it a try

2 of 5 found this helpful

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fennville, MI

Not worth it

August 13, 2013

I bought this sub a week ago, and it does pound. But only with certain notes, to be honest I wasn't impressed or satisfied at all. It completely misses the higher bass tones, it sounds kind of bad to. I would go with two re audio sxx 12's, I had two of those and those blew this sub out of the water by far, for a little bit more. I personally was not satisfied with this. if you are getting this sub to listen to hip hop and rap, I wouldn't, go with the re audio sxx. I wouldn't spend the $*** on this for how it sounds.

2 of 6 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

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 XXX15D4 Subwoofer

Mono Amp

2 Channel Amp - Bridged

2 RE Audio XXX15D4 Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

3 RE Audio XXX15D4 Subwoofers

Mono Amp

4 Channel Amp

4 RE Audio XXX15D4 Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

Browse 1 question and 1 answer
Hide answersShow all answers | Sort by
Whats the difference between this woofer and the RE Audio V2 version of this woofer?
Sonny B on Jun 22, 2015
Best Answer: Hello Sonny,

Specifically, better power handling (obviously not MORE) for an extended period of time - due its beefier Aluminum Voice Coil . Within that there are various minor changes that RE didn't specify, but you are free to contact them for more information.
Reply · Report · Rick MStaff on Jun 22, 2015
· Add Answer · I Have This Question Too (0)

Product Summary


Model Number




Internal SKU


Internal Product ID


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 XXX15D4

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