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RE Audio REX8D4

175W 8" REX Series Dual 4 ohm Subwoofer

Discontinued
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This item has been discontinued

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Anything But Entry Level

What RE Audio calls entry level is anything but entry level. Introducing the new REX series. It offers incredible output and distortion free sound you would come to expect from subs costing far more. REX car subwoofers are perfect for those just entering the car audio scene. Popular among the import and other cars where weight is important, these lightweight subwoofers are an excellent solution for performance vehicles that can’t have heavy subwoofers with large boxes. The mica filled poly cone is stiff and rigid, while the Santoprene rubber surround allows excellent response. Behind the cone is a high temperature 8-layer copper voice coil, a FEA optimized motor structure, and a conex spider that all assist in the linearity of the subwoofer when in use. With a RMS power handling of only 175 watts, these subwoofers do not require a large, powerful amplifier. However, like all of the RE Audio subwoofers, they are capable of accepting much more power then the recommended RMS. For an entry level subwoofer that is far beyond all the other entry-level subwoofers, trust the RE Audio RES series of car subwoofers to bring great bass in your car.

  • 8" Dual 4 ohm REX Series Subwoofer
  • Power Handling:
    • RMS: 175 watts
  • Impedance: Dual 4 ohm
  • Mica filled poly cone woofer
  • Santoprene rubber surround
  • Pressed steel basket
  • FEA Optimized motor structure
  • Linear Conex spiders
  • Rubber gasket
  • High temperature 8-layer copper voice coil
  • Powerful, single stacked magnet
  • Also found as: REX-D4, REXD4
  • Sensitivity: 81.2 dB
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty

Subwoofer Specifications

Subwoofer Series
Each subwoofer manufactured is part of a series. This is the name of the subwoofer's series.
REX (RE Audio)
Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
8"
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.
175 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.
4 ohms
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".
81.2 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.
12 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.
Mica Injected Polypropylene (MIPP)
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.
Santoprene Rubber
Magnet Structure
Defines the overall structure of the subwoofers magnet.
Single 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
Sealed
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.
0.3 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.
0.35 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.
0.35 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.
0.5 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.
4-1/2"
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.
7-3/16"
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.
22.8 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.
27.1 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.
0.34
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.
0.38
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.
3.2 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.
4.21
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
72%
4 Star
17%
3 Star
2%
2 Star
6%
1 Star
2%

Average Attribution Rating

Durability
4.5
Value
4.6
Features
4.3
Design
4.7
Usability
4.5
Stitched

AZ

Overall
Durability
Value
Features
Design
Usability
Great lil 8

November 9, 2012

Did 4 of these at 2 ohms in a sealed enclosure and the sound quality was very good, for the price they are a great lil 8".

7 of 11 found this helpful

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Thomas

Bluffton, SC

Overall
Durability
Value
Features
Design
Usability
overrated

December 29, 2011

Great looking sub. Material cone and surround is made of seems to be of good quality, my biggest complaint of this sub is the cheap hookups for the speaker wire. Upon installation one of the negative legs broke on me. for a few bucks extra they could have used a better quality connector.

I used this sub to replace the factory 8 in my 02 yukon. It is powered by the factory amp and sounds decent for what it is but i do not believe it would take much more than 100-125 watts. It will do for now but honestly i wish i had shelled out a few extra bucks and got a better sub.

7 of 11 found this helpful

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Scott V

Killeen, TX

Overall
Durability
Value
Features
Design
Usability
Sounds great and what a price

October 23, 2014

I installed 4 of these in my Porsche 911. Awesome sound and hit low for 8's. I'd say this line is comparable to the JL w1 series. Sounds really really good and a low price. I would buy again.

5 of 8 found this helpful

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Glenn

Grants Pass, OR

Overall
Durability
Value
Features
Design
Usability
One Awesome Sub!

May 2, 2012

I needed a sub for my car that would give me decent bass and weigh as little as possible. I tried the REX8D4 figuring that for $49.00 I couldn't go wrong. Was I ever amazed at what this sub can do!! I built a .35 cu. ft. box for it and lined the interior with .75" of three layer Sonic Barrier and it's getting 150 watts at 2ohms.

After spending an hour of listening to various types of music, I found this sub to hit just as hard as the REX10D4 and it goes just as low (about 30Hz). The best part is, it can be crossed over as high as 125 Hz and will give you suberb mid bass as well as the lowest of frequencies. The transient response is fantastic, it does not sound muddy at all and the best part is it does all this at very high SPL levels!!

This sub is a great buy and will not disappoint you in any way!!!

7 of 12 found this helpful

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C

California

Overall
Durability
Value
Features
Design
Usability
Holy Moly!

October 1, 2010

WOW! So i hadnt really heard too much about RE before but i was looking for a cheap sub to hold me off until i could afford a better quality woofer. now, i dont have to get a better quality woofer! for 45$ shipped, you will not find a better sub than this. 175 watts RMS my ass! this little monster will easily handle more as long as you know what you're doing. great bass, relatively shallow mounting depth, great company but priced the same as those cheap china knock offs, what more could you possibly want! all for $45!!!!!!
I'm now an RE fan for life!!!!

8 of 14 found this helpful

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ICJ

Austin, TX

Overall
Durability
Value
Features
Design
Usability
Exceeded expectations

March 14, 2013

More than enough power to feed my truck. I like the remote bass adjustment that's mounted up under the dash for quick adjustment on the fly.

6 of 11 found this helpful

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Big Poppa

Omaha NE

Overall
Durability
Value
Features
Design
Usability
Good bass for 8

February 13, 2013

I hade to downsize to 8 inch subs because my 2 12 inch kenwoods was taking up too much trunk space. Never heard of this brand so I figure for **** I get 3 of these. Also order a box that will hold 3 subwoofers.
Got in 3 days shipping is fast. Hooked them up and wired it down to a 2ohm load and hook it up to my kenwood amp 900rms @ 2ohms. Let me tell you these things blew out my kendwood 12s. These little 8 inch subs put out some serious bass. Hitting the high and lows good. Tested out several songs from hip hop, R&B, old school hip hop and R&B,House music to Dub Step. Wasn't expecting much from them but now I'm rolling with RE audio for now on

4 of 7 found this helpful

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Alexander

West, Michigan

Overall
Durability
Value
Features
Design
Usability
RE Audio REX 8" Subwoofer

August 10, 2012

Great subwoofer. Definitely handles enough power to make a good boom. At one point I had it wired at 2ohms to an Alpine 500 wrms@2ohm amp (I doubt it was getting 500watts with the gain half and the boost all down) Now it's getting less than 150wrms@2ohms and it still vibrates my mirrors and seats, ya know? Great product for the price. It will definitely handle more than 175 watts, and it will definitely be recommended to others. Fast processing, fast shipping. 2 Thumbs up SonicElectronix.com.

6 of 11 found this helpful

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Mike P

Bayville, NJ

Overall
Durability
Value
Features
Design
Usability
Big bang for the buck

December 6, 2011

I have this run in parallel on an MTX terminator amp. Gains about halfway and this little 8" hits harder than some 10s I've heard. I have it in a sealed box, which it's really not even designed for, and it still sounds great. Very clear, solid bass. And for $50, you really can't go wrong. It does tend to bark a bit at higher volumes, but I'm thinking that's me. I keep forgetting it's an 8".

5 of 9 found this helpful

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kim_bass_slayer

Norway

Overall
Durability
Value
Features
Design
Usability
Great value and fun

July 11, 2014

This a good mid-bass. Havent triad it as a subwoffer in my caravan jet :) cant wait :)

3 of 6 found this helpful

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fredzuki

phoenix, AZ

Overall
Durability
Value
Features
Design
Usability
Holy Cow !!!

July 8, 2014

purchased and installed 2 sets of MB Quart OSC213, a pair of RE Audio REX8D4, a Soundstream PN2.350D (for 8"s) and PN4.320D (for mids & tweets) controled by a Kenwood KDCBT558U. 8"s are in minimal enclosures(sealed) . this system is in a 2005 Ford f-250 Super Duty Crew Cab. Incredible sound. couldn't believe my ears. WOW!! the REX8D4's feel and sound like more expensive 10"s. i HIGHLY recommend ALL these components,and will use them again on future installs...

4 of 8 found this helpful

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Cadillac

Spring Hill, FL.

Overall
Durability
Value
Features
Design
Usability
excellent for the $$$

March 1, 2013

I have 3 of these in a custom closed box with a Rockford T600-2 pushing them and they're vibrating the heck out of my rear view mirror in my 03 Deville.

5 of 10 found this helpful

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colleeeeee

Ridgefield, WA

Overall
Durability
Value
Features
Design
Usability
sweet sub for the cash

January 30, 2013

I have the re audio rexd8 in a single cab nissan hooked up to a 400w rms mono amp turned up all the way. The sub sounds awesome with little to no distortion. Sealed box is recommended. The only part of re audio i am disappointed in is their cheap connections for wires. Will be buying another rex8 sub for the other side.

3 of 6 found this helpful

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n/a

Tomball, Texas

Overall
Durability
Value
Features
Design
Usability
Great sub for $50

October 11, 2012

I have four of the RE 8 w/ flared ports, tuned to 40hz on a Rockford Fosgate Power T500/2 w/ .55 cu/ft each. Sounds great, low, and loud. I listen to all types of music. Sure there are great subs out there but you can't go wrong with these little subs for 50 bucks each. Also, I purchased an RE SE 10 inch from sonic 4 years ago and still sounding great.

4 of 8 found this helpful

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Crackstorm

Los Angeles ,CA

Overall
Durability
Value
Features
Design
Usability
Great item

June 4, 2012

Great item and really fast shipping and exactly the same as seen on the website. Really good quality.

2 of 4 found this helpful

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Steven

Little Elm, TX

Overall
Durability
Value
Features
Design
Usability
Talk about bang for the buck...

May 12, 2012

I bought this sub for my wife's Pacifica. She wanted a little more low end but nothing that takes up as much room as my Punch 15. I put it in a 1 cubic foot box tuned to 30hz and it truly amazed me. It sounds so much better than the 15 (nearly as loud, plays way deeper) that I don't think the wife is getting this one back. I want to sell the 15 now and buy 4 more of these.

Definitely recommend. I'd recommend this at twice the price. Maybe the best sounding sub I've ever owned.

1 of 2 found this helpful

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TonyB

Lenoir City, TN

Overall
Durability
Value
Features
Design
Usability
RE Audio REX 8

April 16, 2012

50 bucks shipped for a quality 8" sub is a great deal. Like mentioned in earlier reviews, the speaker terminals are bargain basement slip on crimp connector type, but the value/output of these little monsters more than makes up for it!! I started off with 2 8's in a 1.2cube ported box (to around 34hz), then cut out where the port was and put in a 3rd 8. The output of the ported box(on 300 total watts) was a little more, but I like the solid/linear sound of the 3rd 8 in the now sealed box. With about 250 total watts to them.

2 of 4 found this helpful

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Alex

San Antonio, Texas

Overall
Durability
Value
Features
Design
Usability
Build Quality

February 10, 2012

I would not recommend this product. The build quality is absolutely terrible. The materials are cheap and the sub is poorly constructed. I bought three of these and put them in a sealed box and have them roughly 125watts each. The subs were stressed with that amount of power and I doubt they could handle 175watts. Within one month one of the subs started to rattled and I sourced the noise to the spider. The spider had come unglued from the sub cone. I re-glued all the spiders just to make sure it wouldn't happen again. Shortly after one of the other subs dust cap came unglued from the surround. Also the magnet covers fit loosely and look cheesy. The subs could really benefit from push terminals instead of quick disconnects. Once you solder your wires on it takes some maneuvering to get the subs in or out of the mounting hole. Overall i was very disappointed with the subs.

3 of 6 found this helpful

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Brandon

Bellingham, WA

Overall
Durability
Value
Features
Design
Usability
Good sub for the buck

January 5, 2012

Installed this 8" in a 4runner for my buddy; running of an RE XTX-500.5. Awsome woofer for the money sounds clean in a sealed enclosure. Only real complaint is the connectors for the voice coil. Would have been nice to see some push or twist connectors, but cant complain to much for the price.

1 of 2 found this helpful

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Oscar

Lemoore, CA

Overall
Durability
Value
Features
Design
Usability
Daaamn talk about bass

November 27, 2011

I have 2 of the REX8D4 subs in a 2004 Roush Ford 4dr truck under the back seats connected to a Crunch Powerzone 1400 Getting 350 watts per sub at 4ohms and those baby's hit hard. All i need now is Some new Tweeters and speakers cause everything is stock right now. I highly recommend these.

1 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

Belva 23 ft. of 12 Gauge Speaker Wire

Ultra-flexible PVC blended jacket for easy installation.

Your Price $9.99

20 Square Feet of Sound Dampening Material

NVX Sound dampening is thicker than competitors, eliminates rattles and gives you bigger bass!

Your Price $59.99

Dynamat Sound Dampening Trunk Kit

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

Your Price $109.95

Stinger Sound Dampening Trunk Kit

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

Your Price $69.99

12 oz. Can of Adhesive Spray

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

Your Price $6.99

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 $14.99

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

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 REX8D4 Subwoofer

Mono Amp

2 Channel Amp - Bridged

2 RE Audio REX8D4 Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

3 RE Audio REX8D4 Subwoofers

Mono Amp

4 Channel Amp

4 RE Audio REX8D4 Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

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Product Summary

Manufacturer

Model Number

REX8D4

UPC

611892991019

Weight

7.00lbs

Internal SKU

rex8d4

Internal Product ID

27300

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 REX8D4

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