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JBL MS-12SD2 (Open Box)

900W RMS 12" MS Series Dual 2 ohm Subwoofer

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The New Sound of JBL: MS Series Subwoofers

JBL MS-12SD2 Subwoofer JBL MS-12SD2 Subwoofer Cone

The Cone

No sound system is complete without some seriously deep bass. The hard hitting 12" JBL MS-12SD2 subwoofer provides just that. The dual voice coils allow for greater flexibility and more wiring options.

  • Lightweight polypropylene cone
  • Double stitched laminated polyurethane and fabric surround
  • Peak power handling: 1800 watts
  • RMS power handing: 900 watts
  • JBL MS-12SD2 Subwoofer Connections

    The Details Matter

    JBL has carefully engineered and constructed the MS-12DS2 from the ground up to ensure use for years to come. The durable, light weight aluminum basket is nonferrous, which dedicates more magnetic power to the motor assembly.

  • 56 oz. Barium ferrit magnet structure
  • Silver-plated push terminals
  • Stitched tensil weaves
  • Vented pole piece
  • The Sound of quality

    Sonic Electronix, one of the leaders in car audio, recently visited Harman, the premium global audio and infotainment group, at their research and development locations in Northridge, California and Detroit, Michigan. The purpose of these visits was to utilize and combine the powerful brand of Harman and the industry leading knowledge behind Sonic Electronix to begin working together on developing future car audio projects.


    General Features

    • 12" Dual 2 ohm MS Series Subwoofer
    • Power Handling:
      • Peak: 1800 watts
      • RMS: 900 watts
    • Impedance: Dual 2 ohm
    • Polypropylene cone material
    • Laminated polyurethane and fabric surround
    • Vented pole piece
    • Designed for both sealed and vented enclosures
    • Aluminum frame with black epoxy coating
    • 2-1/2" Copper voice coil with Kapton former
    • 56 oz. Barium ferrit magnet structure
    • Silver-plated push terminals
    • Frequency response: 30-400 Hz
    • Sensitivity: 87 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.
    MS (JBL)
    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.
    1800 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.
    450 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.
    2 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).
    30 - 400 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".
    87 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.
    6.5 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.
    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.
    Poly Coated Cloth
    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.
    0.95 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.
    0.95 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.
    1.7 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.
    1.7 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.
    35 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.
    49 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.
    3.7 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

    Accessory Tools and Products

    Accessories added

    Single 12" Subwoofer Angled Truck or Hatchback Box Enclosure

    CARB Compliant, 5/8" MDF Shallow Sub Enclosure Lined with Polyfil.

    Your Price $29.99

    12" SingleHatchback Style Small Sealed Subwoofer Enclosure

    CARB Compliant, 3/4" MDF Dual Hatchback Style Sealed Enclosure w/ Premium Carpeted Finish

    Your Price $42.95

    12" Subwoofer Small Sealed Enclosure

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

    Your Price $44.95

    12" Medium Sealed Subwoofer Enclosure

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

    Your Price $47.95

    12" Vented Subwoofer Enclosure

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

    Your Price $65.95

    Single 12" Venteded MDF Subwoofer Enclosure

    12" Vented 3/4" MDF Enclosure Lined w/ Polyfil.

    Your Price $44.99

    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

    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

    Universal 12" Subwoofer Grille

    Keep your subwoofer safe from accidental damages with this amazing grill.

    Your Price $19.95

    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 JBL MS-12SD2 (Open Box) Subwoofer

    Mono Amp

    Mono Amp - Option 1

    2 Channel Amp - Bridged

    2 JBL MS-12SD2 (Open Box) Subwoofers

    Mono Amp

    2 Channel Amp

    4 Channel Amp - Bridged

    3 JBL MS-12SD2 (Open Box) Subwoofers

    Mono Amp

    Mono Amp - Option 1

    4 Channel Amp

    4 JBL MS-12SD2 (Open Box) Subwoofers

    2 Channel Amp

    4 Channel Amp

    Browse 3 questions and 10 answers
    Hide answersShow all answers | Sort by
    Why did you choose this?
    Sonic Electronix Store
    Only had one just wanted to add another. Going in my Jeep Wrangler. One does the job but want one more to add to the system.
    RICK M on Nov 11, 2014
    I thought JBL made quality products, but this sub was shit.
    Dante S on Aug 13, 2014
    I have a friend with this same subwoofer. He recommended it, and there was a great deal on the product.
    Rashawn M on Oct 23, 2014
    Ive heard it before from a friend and think it's awesome.
    asdasd a on Aug 5, 2014
    What size (Wattage) mono block amplifier do you recommend for running 2 of these speakers?
    Sianyde on Oct 30, 2014
    Best Answer: 1000- 1700 amp I have an single sub in my 2002 Jeep Wrangler with an 500 watt kicker amp. I've taken the back seat out and have it in the middle of the jeep and it hits pretty good! The style of music you like plays into it also. I like classic rock, pantera, funk ect. I have my amp set 3/4 almost wide open with the crossover set between 50-60 hertz and 1/4 bass boost. The CD player settings are sub -1 low-2 mid -1 highs + 8 but, all is preference. I like the high attack on the kick drum and this set up works best for my jeep for the sound I'm looking for. Being a drummer/ musician, clarity is what I want!
    Reply · Report · Rick M on Nov 2, 2014
    · Add Answer · I Have This Question Too (0)
    hello i buy srg6953 and pair of subs wf2520 and amplifier xc1410 and asked to me if it is sufficient for the pair of subs s or is better buy one more amplifier.?

    markoz on Feb 18, 2015
    JBL MS-12SD2
    JBL MS-12SD2
    Clarion SRG6953R
    Clarion SRG6953R
    Clarion XC1410
    Clarion XC1410
    Clarion WF2520
    Clarion WF2520
    Best Answer: Hello Marcos,

    The Clarion XC1410 is intended to run FOUR Door Speakers, it isn't necessarily intended to run a Subwoofer, especially two, considering its lack of power. It can be done, but you will not get the performance you seek. Please consider a MONOBLOCK for JUST the subwoofers instead.
    Reply · Report · Customer SStaff on Feb 21, 2015
    · Add Answer · I Have This Question Too (0)

    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: JBL MS-12SD2 (Open Box)

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