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MB Quart PWM304

500W 12" Premium Series Dual 4 Ohm Subwoofer

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List price $249.99

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Save 25% off a 12" sealed subwoofer enclosure with your purchase!




MB Quart PWM304



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Single 12" Sealed MDF Subwoofer Enclosure (Belva MDFS12)


Special Price $23.99 ($31.99 if purchased separately)

Single 12" Sealed MDF Subwoofer Enclosure (Belva MDFS12)

• 3/4" Medium Density Fiberboard Construction
• Durable Black Carpeting
• Pre-Lined with Poly-Fil
• Gold Speaker Terminals

(Offer 1 of 1)

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General Features:

  • 12" Dual 4 Ohm Premium Series Subwoofer
  • Power Handling:
    • Peak: 1000 watts
    • RMS: 500 watts
  • Impedance: 4 ohms
  • Carbon fiber cone and dustcap
  • UV Resistant butyl rubber surround
  • Red nomex spider
  • Quick change impedance terminal
  • 2-1/2" High temperature voice coil
  • Anti-resonant magnet cover with deep drawn stamp steel basket
  • Heat-dispersing vented pole plate
  • Resonance Frequency (Fs): 27 Hz
  • Top-mount depth: 6-11/16"
  • Sensitivity: 84dB
  • 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.
Premium (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.
1000 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.
500 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".
84 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.
14.5 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.
Carbon Fiber
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.
Butyl 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
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.
1.25 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.
1.5 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.
2.5 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.
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.
27.25 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.
59.911 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.
7.2 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.

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


orange park, fl

Rich Deep Bass

March 20, 2014

So i pulled the trigger. Seems like I'm the first one too! There is a huge lack of reviews for this subwoofer. I've searched the internet high and low and never found but maybe 1 so let me get started!

The speaker itself: MB Quart put the time and effort into designing and building this subwoofer. It is very well made with nice spring loaded hideaway terminals, a beefy rubber surround, woven fiber cone, heavy magnet, and very lightweight but STRONG basket. It is certainly unmistakable for their "premium" line of speakers. I really like the selectable impedance feature which is also fused to protect the voice coils. In theory you shouldn't ever be able to run too much wattage through them and cause the coils to blow. I'm powering it with a Rockford Fosgate R500X1D which i bought from Sonic. A perfect match to the subwoofer producing 500 watts at 2 ohms.

Onto the sound: I have it in a sealed 1.25 cubic ft Ground Shaker box (also bought here) and it sounds tight and clean! For the record I'm a 10" sub type of guy and would never use anything other than a sealed enclosure for accuracy. Jazz, classical, swing, and very musical compositions in general sound fantastic. I'm very impressed with the reproduction of bass drums kicking and string basses playing. I thought it would be boomy or muddy (because I'm the 10" subwoofer guy) but it wasn't! Now because I want to be fair and right a review for everybody, i had to play some hip hop and trap music for all the bass heads. Here's the deal on that.... I think we all can agree 84 decibels of sensitivity is on the low side. That said at 500 watts RMS, the bass comes through loud and clear, but if you want it to shake your mirrors off, you're better off with 2 and probably in a ported box. MB Quart even states in their description on their site that this subwoofer is intended to be musical and not for the SPL crowd of people and I agree! I'm a big band swing/ jazz listener so it suits my needs and adds the perfect amount of clean accurate bass to my setup. Overall I think it's worth checking out for sure. I know there are a lot of subwoofers out there under $100 that are amazing and I know that's why there are next to no reviews for this item. That and the Maxxsonics ownership which I get it...they are lower end, but you inevitably get what you pay for and a higher priced MB Quart subwoofer comes with a higher quality build. I love Sonic Electronix and definitely a customer for life with them, but if they want this sub to sell, they need to come down on price to match their competitors which is why I gave it 3 stars on value. Other than that, I'm happy!

15 of 29 found this helpful

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east saint luois

good but.....a little high

June 10, 2014

im piggy back off the first review i woulndt pay 200 bucks for a 10 inch sub
when i could get most 15 inch subs for a little more money but like the first reviewer said if thats your thing pay the 200 but im a 15inch guy i woundt use any thing other than that siz driver its a great quality sub dont get me wrong just kinda steep in price....and sonic is absolutly the only place i order from iv done business withh them on 3 occasions and each time it was flawless .......

10 of 28 found this helpful

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Accessory Tools and Products

Accessories added

12" Vented Subwoofer Enclosure

CARB Compliant, 3/4" MDF Vented Enclosure Lined with Premium Carpeted Finish

Your Price $65.95

NVX 25 ft. of True Spec 12 Gauge Speaker Wire

100% OFC wire with EnvyFlex metallic jacket insulates and protects against damage from extreme conditions.

Your Price $39.99

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

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

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

12" Protective Waffle Subwoofer Grille

Keep your subwoofer looking amazing while keeping it safe.

Your Price $4.99

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 PWM304 Subwoofer

Mono Amp

2 Channel Amp - Bridged

2 MB Quart PWM304 Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

3 MB Quart PWM304 Subwoofers

Mono Amp

4 Channel Amp

4 MB Quart PWM304 Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

Browse 2 questions and 2 answers
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Why did you choose this?
Sonic Electronix Store
Power capacities and sound quality that this subs offer is just amazing for the price. The glassfiber looks awsome and the design of this sub is just incredible. I have never been disapointed by MB quart so far
Pierre-luc D on Apr 23, 2015

I'm planning to buy the MB Quart premium subwoofer (PWM304) with an amplifier and sub enclosure but before I do so, I would have 2 questions.

1. Since it's made in glassfiber, is it sensitive to temperature? I live in Quebec Canada and during winter it can be really cold... (-25 oC = -13 oF). I don't want to push it at maximum performance in such temperature but I don'T want it to breaks just because it's cold...

2. Since this sub got 2 connection options (2 ohms or 8 ohms), wich amplifier would you recommend (still in the MB quart series if possible)? I would have only 1 sub (1 PWM304 in 2 ohms I guess). I was thinking of the RA 1000.1 but with 750W available, for the 500W subwoofer, it looks a bit too much.

Thank you and have a nice day!
Pierre-luc D on Apr 23, 2015
Best Answer: Hello, first off no issues with either extreme heat or cold with mine. I live in Kentucky and last summer it was in the low 100's and winter was 20 below. My car is also black so the temps would rise even more inside.

Second I had 2 of these and was using the reference 2000.1 on them running a 1 ohm load at the amp and had no issues with them. The problem is not supplying enough power. Running too little power to a sub will damage it more than running a little too much. Unless you plan on running 3000 watts continuous power to it at length I wouldn't worry about it.
Reply · Report · lee h on Apr 23, 2015
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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 PWM304