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RE Audio XX 18D4

1500W 18" XX Series Dual 4 Ohm Subwoofer

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List price $1574.99

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Brutal Power Handling

The XX series are the newest edition to a high-end woofer collection from RE Audio. This woofer borrows a lot the same features as the infamous XXX subwoofer, but for a much more affordable price!

The XX subwoofers use a dual composite 2-piece cone, and a rubber surround. They are housed in a cast aluminum basket and still use the 3 8-Layer Aluminum Flat Wire Voice Coil that you find the flagship XXX. The XX woofers can be found in 12, 15, and 18 sizes, and both dual 2 ohm and dual 4 ohm configurations.

All of the XX subwoofers can handle 1500 watts of RMS power. The XX line-up shares many characteristics with the XXX. In fact, the main feature that separates the XX and the XXX is the magnet size. The XX woofers still use a very large magnet, however.

General Features:

  • 18" Dual 4 Ohm XX Series Subwoofer
  • Power Handling:
    • RMS: 1500 watts
  • Impedance: 4 ohms
  • Dual composite two-piece cone
  • Ultra rubber surround
  • 3" 8-Layer aluminum flat wire voice coil
  • FEA-optimized motor structure
  • Cast aluminum basket with vented magnet system
  • Dual progressive spiders
  • Integrated tinsel leads
  • Cast aluminum gasket
  • Tork-tite terminals
  • Top-mount depth: 12-1/2"
  • Displacement: 0.30 cu. ft.
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty
  • Also found as: RE Audio XX, RE XX, XX18D4, XX18, XX Woofer

Need the Perfect Subwoofer Enclosure?

Check out the RE Audio XX 18D4 Subwoofer Enclosure Guide

Product History:

RE Audio XX18 V2D4 thumbnail
(newest, current model)
RE Audio XX 18D4 thumbnail
(previous model, replaced by RE Audio XX18V2D4 (XX18 V2D4))

Subwoofer Specifications

Subwoofer Series
Each subwoofer manufactured is part of a series. This is the name of the subwoofer's series.
XX (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.
1500 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.
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.
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

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.

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


Manor, Tx

Beeeeeast !!!!!

March 16, 2014

These subs are no joke. Got a 2500 Rockford bdcp wired to 1 ohm had to get a high output alternator just to keep up with the power. Got 2 of these in a huge ported box built from the ground up and these things will knock you in tomorrow. My box is tuned to about 27 htz and im devouring the lows like no other. Upgraded from 2 l7 15s and they beat but I've tapped into another dimension with these. These 18s get nasty low and im still banging for Jesus. RE audio ships there subs with quality and when I brought these subs to the audio shop everybody's mouth dropped because of the size of this subwoofer. One of the guys that were there said "You gon killem" lol. Im doing around 3248 rms and they can take more. Thanks sonic electronics for the good deal you gave me.

2 of 5 found this helpful

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1 RE Audio XX 18D4 Subwoofer

Mono Amp

2 Channel Amp - Bridged

2 RE Audio XX 18D4 Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

3 RE Audio XX 18D4 Subwoofers

Mono Amp

4 Channel Amp

4 RE Audio XX 18D4 Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

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Product Summary


Model Number

XX 18D4



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 XX 18D4

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