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MB Quart RLP204

200W 8" Reference Series Low-Profile Dual 4 ohm Subwoofer

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List price $119.95

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General Features:

  • 8" Dual 4 ohm Low-Profile Reference Series Subwoofer
  • Power Handling:
    • Peak: 400 watts
    • RMS: 200 watts
  • Impedance: 4 ohms
  • Injection polypropylene flat piston cone for maximum damping and structural rigidity
  • High NBR rubber surround for more cone area and excursion
  • Double-roll reinforced steel frame with extreme shallow mounting for optimized installation
  • Single flat poly cotton spider with woven tinsel lead wire
  • Custom nickel plated push type terminal
  • Recommended use is in sealed enclosures with heavy poly fill
  • Dual 4 ohm 2-1/2 (64mm) voice coils
  • Frequency response: 35-120 Hz
  • Resonance Frequency (Fs): 41.5 Hz
  • Top-mount depth: 2-12/16"
  • Sensitivity: 81.23 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.
Reference Low Profile (MB Quart)
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.
400 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.
200 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.
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
35 - 120 Hz
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".
81.23 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.
8.15 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.
Nitrile Butadiene Rubber (NBR)
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.

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.
0.25 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.
0.50 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.
41.5 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.
12.19 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.
6.2 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.

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


pompano beach, FL

Great Speakers

October 14, 2012

These speakers are great and fit perfect in factory locations on 05 Nissan frontier.

4 of 4 found this helpful

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Orlando, FL

MB Quart - If you haven't heard of it, you should!

October 10, 2012

Deep, heart pounding bass out of a little 8" sub? That's what the MB Quart RLP204 delivers. Used it to replace a factory sub in my GMC Yukon XL and it blows it away even with the stock radio.

5 of 7 found this helpful

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MB Quart

December 30, 2012

I have two of these in the rear doors of my 2006 subaru liberty hooked up to a 1100rms alpine sub amp & they are awesome.I would highly recommend these speakers to everybody.

2 of 3 found this helpful

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Loganville, Ga

Good replacement 8" sub in 07 F150

December 30, 2014

I bought this subwoofer to replace my JL 8w1v2 that had a bad VC and I had limited funds for my next subwoofer. I am working with a limited area in my 2007 f150 scab so this one fits the specs of my previous box. This subwoofer is a great replacement for my JL. I am running this on a power acoustic amp with 150 watts rms and this sub brings in the nice low end my door speakers can't produce. This sub will not vibrate the car next to you with the watts I am pushing to it but it sounds great for my truck. Overall I would love to have my JL back but funds were tight and this sub is a close 2nd.

1 of 2 found this helpful

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Somewhere out there

Great Product

October 20, 2014

MB Quart RLP204 arrived on time and performs exactly as expected. No complaints at all!

0 of 0 found this helpful

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Albuquerque, NM

Very capable little woofer.

August 22, 2013

I was getting tired of my bass heavy system so I decided to go smaller with emphasis on sound quality. I already had purchased MB Quart components and was very impressed. I had never really owned anything smaller than a 10" sub so I was skeptical. I purchased 2 to start and they filled my truck cabin with very clean bass. They don't drown out the higher frequencies like bass-heavy systems but add some depth and fullness to the music. I went ahead and purchased 2 more and WOW! I currently power them with a Soundstream Rubicon 1000 at 2 ohms. Very happy to own these subs. So if you're looking for tight, clean bass without being too boom-heavy, look no further!

1 of 2 found this helpful

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Keith K

Miami, FL

Really good Amplifier

January 3, 2013

I installed the amp in my ford truck and i immediately experienced a significant improvement in the depth and power of the bass.

1 of 2 found this helpful

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ithaca ny

sealed box big sound

November 29, 2013

great sub. Not the best sub you can buy but, has good response and good range. mine is in a sealed 3/4 at about .25sq. for the money and size im very satisfied

0 of 1 found this helpful

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Good product

September 17, 2013

Looks good and sounds good. But don't expect big punch. These really are only designerd for small enslosures and tigh spots in little cars. They are a good compromise.

0 of 1 found this helpful

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Southlake, TX

Worked Great!

September 17, 2013

Spent some time trying to find the OEM replacement for my Suburban's subwoofer, only to confirm that it has been discontinued.

This speaker fit perfectly and sounds as good, maybe better than my original at a fraction of the price.

My stereo sound is back to normal with full bass.

2 of 6 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

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 $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 MB Quart RLP204 Subwoofer

Mono Amp

2 Channel Amp - Bridged

2 MB Quart RLP204 Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

3 MB Quart RLP204 Subwoofers

Mono Amp

4 Channel Amp

4 MB Quart RLP204 Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

Browse 2 questions and 5 answers
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Why did you choose this?
Sonic Electronix Store
I own some 6.5 two way marine speakers by MB Quart and they sound good so wanted something to match.I will be installing these in my boat.
Manuel B on Dec 27, 2014
fit in factory location for tahoe keeps t clean and factory
CARLOS A on Nov 12, 2014
Quality priceNice protection
steve t on Nov 27, 2014
Where can I find a grill to fit this sub?
A shopper on Aug 20, 2014
Best Answer: if you can wait for it the is a 2 steel bar 1 on amazon, but its coming out of china so estimated delivery is upto 28 business days. Im ordered a atrend 10" 1 today from here and am gonna try and cut 2 inches out and epoxy them back together
Reply · Report · joshua s on Sep 4, 2014
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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: MB Quart RLP204

  • MB Quart Dual 4 Ohm Low-Profile Reference Series Subwoofers
  • Subwoofer Size Buying Guide