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RE Audio REX8S4

175W 8" REX Series Single 4 ohm Subwoofer


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This item has been discontinued

But you may be interested in the newest model that's available.

rex8s4v2 thumbnail

RE Audio REXv2-8

OUR PRICE: $59.99

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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.

General Features:

  • 8" Single 4 ohm REX Series Subwoofer
  • Power Handling:
    • Peak: 350 watts
    • RMS: 175 watts
  • Impedance: Single 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
  • Resonance Frequency (Fs): 24.5 Hz
  • Top-mount depth: 4-1/2"
  • Sensitivity: 82.63 dB
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Product History:

RE Audio REXv2-8 thumbnail
(newest, current model)
RE Audio REX8S4 thumbnail
(previous model, replaced by RE Audio REXv2-8)

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.
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
350 watts
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.
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
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".
82.63 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.
13 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.
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.
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.
0.44 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.
0.74 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.
1.14 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.
1.41 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.
24.5 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.
23.9 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.
3.74 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.

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


Roseburg, OR


September 17, 2013

I have never heard of RE but after owning this little 8 I will be back

6 of 7 found this helpful

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Cicero, IL

Great Replacement

July 19, 2013

First of all it got here in 3 Days, when I paid nothing for shipping. I am using it as a Home Theater sub or a 2.1 system. I had to adjust the mounting hole but aside it was a snug fit. it is being powered by a 70-100w rms amp. It sounds amazing and louder. as of right now i'm in love with it. Definitely Recommend it!

7 of 9 found this helpful

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Burr Oak, MI

Wow! I Love RE Audio Now!

September 3, 2013

I have gone through many different brands of car audio including some of the best. FI/ Obsidian, Sundown, AQ, Kicker, Pioneer, Rockford Fosgate, Audiopipe, Diamond Audio, Skar and much more and i can honestly say that these 8s impressed me very much. I built a box about .85 cubic foot and tuned to 36 hz. and these things sound amazing and are very loud and clear. i put down my friends 2 kicker 12s, I fed them 400 or more watts rms of clean power and they handle it like a champ with no distortion, bottoming out or anything. overall an amazing sub for the price.

3 of 4 found this helpful

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Garden Grove, CA

Excellent Sub for Home Theatre/Backyard Parties!

February 19, 2014

With the low Fs and Qts this sub would be redonkulous in a T-Line enclosure! However, my goal with this driver was to replace a "Kicking" 10" driver that's Comp-arable. (Hint) that was in a HUGE T-Line box. That huge box sat around taking-up lots of space in my home office room waiting for the yearly parties to come around. Sooo I decided to go with a better quality 8-incher and make an L-Slot Ported enclosure to fit into my IKEA Expedit shelving unit. Using Cabinet-Grade .75" Plywood made an enclosure 13 x 13 x 18 for 1.02 cu. ft. internal tuned to 34Hz. Volume sounds same, but plays cleaner! And that's with being under-powered by a Dayton Audio MCA2250E 2.1 Channel Class D Plate Amplifier which gives 50 Watts RMS @ 4Ohms for the sub channel! I would to hear one of these in an AutoTuba enclosure!

2 of 3 found this helpful

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RE Audio REX8S4

May 22, 2014

I bought a pair of these 8's for a car of mine. Space was limited. These speakers are hard to beat for the price. Sound good as well, so a win win.

3 of 6 found this helpful

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Ankeny, IA

Best bang for buck yet!

September 19, 2013

I put these subs in a backpack. I also had a pair of these subs in my car's door, as a 8" door sub.
They sound phenomenal, clean punchy sound, great power handling. I would highly recommend these subs for a sealed box, as they sound wonderful in one :)
give them good clean power though, they love it!

2 of 4 found this helpful

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fort wayne , in

Great sub for the money.

February 17, 2014

I bought this subwoofer to hold me over while I was working onmycustom box for my fi audio sub. i have used the RE for about a month in a simple ported box I made and it sounds really good. Im using rockgord fosgste prime 750 amp which is a little over 200 watts @4 ohm. Using this single 8 folks out the stock sound nicely. Your not going to flex your trunk apart with 1 8. But it has great sound, gets really low and is really a fair price. The only thing I would like to see is spring loaded wire terminals rather than spade connectors. I would suggest it to anyone looking for a nice sounding low hitting 8 in woofer. I have used lanzar max 8s, sunfown audio sa8s, aq/sounqubed, and fi audio just to name a few.

3 of 8 found this helpful

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spanaway wa

awesome product!

February 10, 2014

i honestly have no complaints about this product, i got 4 re audio rex 8's and these things hammer!!! I am very happy about this purchase.

1 of 5 found this helpful

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pasadena, CA

bang for your buck

December 23, 2013

Nicely built.for a 8" sub it rocks..used as an oem upgrade on an hhr factory box. Add a 3/4" spacer and removed stock hhr sub grille..upgraded si sub amp..huge difference. Bass upgrade for less than $100.

1 of 7 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 $14.99

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 $94.95

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

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 $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

1 RE Audio REX8S4 Subwoofer

Mono Amp

2 Channel Amp - Bridged

2 RE Audio REX8S4 Subwoofers

Mono Amp

2 Channel Amp

4 Channel Amp - Bridged

3 RE Audio REX8S4 Subwoofers

4 Channel Amp

4 RE Audio REX8S4 Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

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Product Summary


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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 REX8S4

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