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Polk Audio MM1240 (OPEN BOX COMPLETE)

425W 12" Mobile Monitor Series Single 4 ohm Marine Certified Car Subwoofer

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Polk Audio MM1240 (OPEN BOX COMPLETE)

425W 12" Mobile Monitor Series Single 4 ohm Marine Certified Car Subwoofer

$119.99

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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.

$39.99

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2" Universal, Professional Heavy Duty Roller for Sound Damping/Dampening

Universal rubber roller to make it easy to install sound dampening.

$7.99

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12 oz. Can of Adhesive Spray

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

$8.99

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This is an Open Box Item


We have checked, tested, and confirmed this item to function properly. It contains all the same parts as a new unit, but shows some visible signs of use.
 
This open box product has a 30-day return policy and a 90-day warranty

The Mobile Monitor Series by Polk Audio is the result of 3 years of research and development. The series uses high quality materials and the newest loudspeaker technology to bring the listener an unforgettable experience. The best part about the MM Series is the affordable price.

Item Condition: Open Box Complete

  • Item has been installed, used.
  • Product Features

    • 12" Single 4 ohm Mobile Monitor Series Subwoofer
    • Power Handling:
      • Peak: 800 watts
      • RMS: 425 watts
    • Impedance: Single 4 Ohm
    • Polymer woofer cone
    • Butyl rubber surround
    • Carbon Composite Basket is very lightweight and will not flex during use
    • Marine Certified
    • Nickel plated heavy duty terminals can be used with speaker wire up to 8 gauge or two twisted pairs of 12 gauge
    • Klippel Distortion Analyzer results in the best possible performance at any listening level
    • 2" High temperature copper voice coil
    • Also found as: MM-1240, MM1240svc, MM-1240svc
    • Frequency response: 22-200 Hz
    • Sensitivity: 92 dB
    • db Series Subwoofer Grill Available
    • 1-year SonicElectronix.com warranty

    Subwoofer Specifications

    Subwoofer Series
    Each subwoofer manufactured is part of a series. This is the name of the subwoofer's series.
    Mobile Monitor (Polk Audio)
    Subwoofer Size
    Refers to the diameter of the subwoofer, measured in inches.
    12"
    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.
    850 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.
    425 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.
    Single
    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).
    22 - 200 Hz
    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".
    92 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.
    25 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.
    Polymer/Mica Composite
    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.
    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.

    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.
    .88 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.
    .88 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.
    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.
    4-5/8"
    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.
    11"
    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.
    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.
    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.
    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.
    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
    90 days
    Labor Warranty Duration
    90 days
    Warranty Provider
    Sonic Electronix

    Summary of Customer Ratings & Reviews

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    Accessory Tools and Products

    Accessories added

    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 $37.85

    Belva 23 ft. of 12 Gauge Speaker Wire

    Ultra-flexible PVC blended jacket for easy installation.

    Your Price $14.99

    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 $18.99

    Cordless Multi-Functional Heat Tool Soldering Iron Kit

    Continuous working lock allows you to work without holding down trigger.

    Your Price $74.99

    1mm All Purpose Solder

    Solder is all purpose for use on most projects where solder is needed.

    Your Price $7.99

    12 oz. Can of Adhesive Spray

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

    Your Price $8.99

    Spring Post Terminal Cup

    Makes adding a spring post terminal to an enclosure simple! Banana clip ready!

    Your Price $3.99

    Gold Plated Dual Terminal Banana Plug Connector

    Enables an expandable, secure connection accepting up to 8 gauge wire.

    Your Price $1.99

    Universal 12" Subwoofer Grille

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

    Your Price $19.95

    Universal 12" Subwoofer Grille

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

    Your Price $19.95

    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 Polk Audio MM1240 (OPEN BOX COMPLETE) Subwoofer

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    2 Channel Amp - Bridged

    2 Polk Audio MM1240 (OPEN BOX COMPLETE) Subwoofers

    Mono Amp

    2 Channel Amp

    4 Channel Amp - Bridged

    3 Polk Audio MM1240 (OPEN BOX COMPLETE) Subwoofers

    4 Channel Amp

    4 Polk Audio MM1240 (OPEN BOX COMPLETE) Subwoofers

    Mono Amp

    Mono Amp - Option 1

    2 Channel Amp

    2 Channel Amp - Bridged

    4 Channel Amp

    Browse 2 questions and 3 answers
    Hide answersShow all answers | Sort by
    Why did you choose this?
    Sonic Electronix Store
    i like the brand and the price was great
    Berlin M on Sep 17, 2016
    Small enclosure size fits well in boat
    craig d on Jul 26, 2016
    Hi whats a good marine amp to pair with this subwoofer? This amp will only be powering the subwoofer. Again this is for a marine aplication. thanks Omar
    Omar t on Jul 8, 2015
    Best Answer: Not sure what your budget looks like but the Wet Sounds SD2 is an awesome amp and would pair perfectly. If you are looking at something more economical but still solid, maybe the JL M600\1.
    Reply · Report · Ryan S on Jul 8, 2015
    · Add Answer · I Have This Question Too (0)

    Product Summary

    Manufacturer

    Model Number

    MM1240

    Weight

    16.00lbs

    Internal SKU

    LS-mm1240-OBCRA233339

    Internal Product ID

    106209

    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: Polk Audio MM1240 (OPEN BOX COMPLETE)