MCM Electronics

12" Woofer with Poly Cone and Rubber Surround 120W RMS at 8ohm By MCM Audio Select (55-2973) MCM Part #55-2973

4.5 stars 14 reviews
MSRP: $24.95
You Save: $10.26 (41 %)
Qty.Volume Price

12" Polypropylene Cone Woofer
Low cost general replacement woofer is ideal in a two way cabinets or as a compact subwoofer. It is perfect for a wide variety of home or autosound applications and is ideal for either ported or sealed enclosures.

Also available in 4Ohm Version

Specifications Top

    General Specifications:
    • Nominal Diameter: 12 inch
    • Rated Impedance: 8 ohms
    • Operating Bandwidth: 50Hz ~ 4KHz
    • Power Handling Capacity: 120W RMS
    • Sensitivity (1W/M): 91 dB
    • Voice Coil Diameter: 1.5 inch
    • Overall frame diameter: 12.20"

    Thiele-Small Parameters:
    • Resonance Frequency Fs: 42 Hz
    • DC Resistance Re: 7.2 ohm
    • Mechanical Q Factor Qms: 3.24
    • Electrical Q Factor Qes: 0.5654
    • Total Q Factor Qts: 0.4772
    • Equivalent Cas air load Vas: 122.6 liters
    • Coil Inductance Le: .9099 mH
    • Efficiency Bandwidth Product EBP 74
    • Voice Coil Over Hang X-max 5mm

    Physical Information:
    • Cutout: 10.94"
    • Mounting Depth: 5.04"
    • Basket: Stamped Steel
    • Magnet Type: 30 OZ
    • Cone Material: Polypropylene
    • Surround: Rubber
    • Dust Cap: Polypropylene
    • Damper: Cloth

    Part Numbers
    MCM Part #:55-2973
    MCM Audio Select Part #:55-2973
    Package Specifications & Dimensions
    Weight:5.4 lbs.
    RoHS Comp:Yes
    Warranty:365 days
    Need to Return?
    Length:12.5 in.
    Width:12.5 in.
    Height:6 in.
    Shipping Information
    Extra Shipping Charge:No
    Drop Ship:No

Product Reviews Top

  • by gfansher1976

    on 10/27/2015


    Overall: 3 out of 5

    Well, I was just looking for an inexpensive 12"woofer to build a home theater sub....until I read the book, :Montekay: Everything you ever needed to know and more about speakers and enclosures." Holy schnikes....I'm an amateur but, I felt like I knew a little bit...until I read that review. I'm ready to go to the lumber yard and start building open enclosures to fill the house now!

  • by montekay

    on 6/5/2015

    Perfect for open baffle

    Overall: 5 out of 5

    I’ve tested these woofers from the 6” version through the 15”. At least in the case of the 10” through the 15” version, I suspect very few people are using them correctly. They are making the mistake of mounting them in boxes!

    I see other reviews praising these woofers for being “good for the price” and this is definitely true. I also see comments stating that if you want audiophile quality you should look elsewhere. That’s definitely not true. If you want audiophile quality, these woofers are fine, you just have to use them correctly.

    If you are not familiar with open baffle designs, this is going to seem very strange to you. If you have an open mind to the concept of open baffle you can use these to produce very clean, very detailed, high resolution audiophile bass. In fact I would take a dual floor to ceiling column open baffle system using six to eight of the 12” or 15” version of this woofer over any of the most expensive conventional box subwoofers in existence. Given the low cost of these woofers, you could assemble such a system for less than the sales tax on some “ultra-high-end” systems that wouldn’t hold a candle to the performance of the open baffle system.

    In its simplest form an open baffle system is just a driver suspended in free air. You may have played music through a speaker in free air (no box) and found it to have little or no bass. This is because the front and rear radiation are 180 degrees out of phase and thus canceling. Measured off axis they are always 180 degrees out of phase but measured on axis there will be a phase shift as a function of the separation distance from front to rear. There will be a particular frequency where this phase shift exactly equals 180 degrees resulting in a front and rear wave that are 360 degrees out of phase which is essentially the same as 0 degrees out of phase. This results in constructive interference and a +6 dB increase in output. Above this frequency phase rotation results in alternating constructive and destructive interference. Below this frequency the on axis output rolls off at -6dB/octave.

    The simplest way to construct an open baffle woofer system is to build an, “H-Frame”. This consist of five pieces of wood… two sides, a top, a bottom, and a center mounted baffle. If you google H-Frame open baffle you will find lots of information on this. Having the woofers mounted in the H-frame increase the separation distance between the front and rear of the cone relative to simply suspending the woofer in free air with no baffle. This lowers the frequency where the -6 dB/octave roll off begins. The one complexity of the open baffle system is in the EQ that is required to correct for this -6 dB/octave roll off but with the availability of products like the miniDSP 2x4 this is no longer an issue.

    Conventional box woofer systems need to increase their volume displacement as an inverse square with frequency. If you halve frequency from 40 Hz to 20 Hz for example you have to increase the volume displacement by a factor of four. Open baffle systems however follow an inverse cube function so in order to go from 40 Hz to 20 Hz the volume displacement must be increased by a factor of eight. This is why open baffle systems typically use multiple large cone woofers. That’s where these low cost drivers come in… you can buy a lot of them for very little money! There are other low cost drivers available but it’s very unusual to find inexpensive drivers that are not either noisy, high distortion, or both. The 12” version at a little over 30 Hz the 2nd and 3rd harmonic (5 watt input) are over -35 dB down. Above this frequency the 2nd drops slightly and the 3rd drops dramatically. Even at 20 Hz higher harmonics are -40 to more than -50 dB down. The only issue is that below 33 Hz or so the 3rd is higher than the 2nd which is not a good thing but compared to most woofers, even far more expensive woofers, these results are excellent!

    People don’t usually realize that the harmonic distortion in most subwoofers is far higher than what these woofers produce. The 15” is even better, at 20 Hz (again 5 watt input) the 2nd is -25 dB and the 3rd is -30 dB. Higher harmonics are from about -45 to over -60 dB down. You will be hard pressed to find any woofer at any price that can perform at this level of low distortion. I have posted the data on these woofers here…

    Nice thing about an open baffle woofer system is that things like Qts are not very important and in fact, a higher Qts is a good thing to a point. That’s the one area where these are a little off because it’s actually a little too high. Actual measurements came in much higher than the posted data but that’s easily dealt with in the DSP EQ. Conventional box woofers need to have a much lower Qts than these for any size box. This means a much bigger magnet, sturdier frame…etc, etc… higher price… Given that Qts on these typically runs 2.0+ the correct size box would be larger than the observable universe. So while you can put them in a small box and get typical “mass market” low grade boomy sound quality out of them it really makes no sense. These are woofers capable of higher resolution lower distortion bass than most commercial products costing thousands of dollars but only if used correctly. If used conventionally they are mediocre at best but still “good for the price”.

    If you want to build an open baffle system with these there is plenty of information on the web on how to do this. Keep in mind that because the front and rear are 180 degrees out of phase at all frequencies off axis the resulting bass output on axis is directional. Conventional woofer systems are not directional and most people use just one subwoofer. With open baffle you will use two, a left and a right and you can have stereo bass. Directional stereo bass is not possible with a conventional woofer system. So plan on building two and plan on using multiple drivers in each. For my small NY apartment I’ve found having two of the 10” version in each H-frame is adequate but this is true only because I never turn it up very loud. I’m planning on using two 12” in each H-frame in my Taiwan apartment. In my Texas home, my home theater uses twelve of a much more expensive 15” in each floor to ceiling column. This is enough to shake the entire room to 13 Hz. If that system needed to be rebuilt I would definitely consider the 15” version of these MCM woofers as it would be nearly as capable and for a tiny fraction the price.

    Note: If you build an open baffle system with these or any other woofers and do not do the proper EQ you will think they are the worst woofers you have ever heard. It has to be done correctly. Proper measurement equipment is a must to properly EQ the system! “ARTA” is free to download for non-commercial purposes but you will also need a quality calibrated microphone and sound card. I use an M-Audio Mobile Pre and an Earthworks M30 calibrated microphone. This is about a $700 microphone but you can use a cheaper alternative from Behringer (ECM8000) for about $60.

    Cons: I have gotten a couple bad ones, one 10" and one 12" with voice coil rub but MCM promptly replaced them. The 10" was really bad, anyone would immediately notice it was bad. The 12" wouldn't be immediately noticed by the average customer but sweeping it with a tone generator it was obviously noisy. If you're going to be a serious speaker builder you need a good tone generator. You can tell a lot just sweeping a driver.

    I have been designing/building loudspeakers for more than 40 years and building open baffle systems for over 20 years. These low cost MCM woofers are by far the best solution I've found for building a low cost high resolution open baffle woofer system.


  • by danj20

    on 3/20/2014

    Great replacement woofer

    Overall: 5 out of 5

    Let me begin that I am 66yrs. old and I am replacing a 12 " woofer from a Realistic Nova 500 that I purchased back in the Eighties (I know dinosaur time) but the foam surround crumbled away. This woofer was drilled for 6 holes and the Realistic was drilled for 4 holes so I bought particle boards screws from Lowes (no pre-drilling necessary)and just had to screw in 4 holes to mount the new MCM woofer and it worked just fine!!! The existing 2 holes matched up great.
    I am now rocking out to Creedance Clearwater and the classic oldies!! I am alive again! Thank you MCM!!!

  • by mrphilco

    on 1/31/2014

    Great replacements for Pioneer CS-88 boxes

    Overall: 5 out of 5

    I needed two woofers with six hole mounting to replace the woofers in a pair of Pioneer CS-88 speaker cabinets. These fit very well and sound great...better than I expected after reading some of the reviews. You can hear and feel the bass from these. While they are not quite as strong as your 55-2962 woofers, they still produce a pleasing sound and are an excellent value for the money. If you must have 12 inch woofers with six hole mounting, these are a great choice.

  • by Spaker

    on 11/20/2013

    Excellent Woofer Replacement

    Overall: 4.5 out of 5

    Used a pair to replace Pioneer 12" from the 1990s tha had rotten foam rubber. They SING. They THUMP. They are perfect for my uses. Ordering hem again for sure.

  • by jbird604

    on 3/10/2013

    Great 12" sealed box woofer, odd 6-hole mounting

    Overall: 5 out of 5

    Very good replacement for 12" subs in Lowrey, Baldwin, and other organs with bass speakers in sealed boxes, an awful lot of speaker for such a low price. (If you're superstitious about impedance, it also comes in 4 ohms.) Huge bass and quite efficient, probably sounds better than the originals. Note however the peculiar 6-hole mounting pattern. When putting into a box that had 4 or 8 screws, you'll have to spend a few minutes re-locating or improvising your screws or mounts, though exactly two of them will still be in the right place!

  • by davisp

    on 12/5/2012

    Sound Great

    Overall: 5 out of 5

    Put these in a 1965 Wurlitzer Jukebox. Very good sound for the cheap price. Super fast shipping.

  • by fattytca

    on 9/8/2012

    Just okay...

    Overall: 3 out of 5

    They were only $10.99 so what can you expect? I used them to replace some old cerwin vega 12" woofers in a 3 way cabinet.... one of the old woofers was blown. Rather than toss the entire speaker, I figured I'd try a quick fix... My initial thought was that hey, these are made of better material (poly vs. paper), they have the rubber surround vs. foam (which ALWAYS rots in those old CV's), and they're about 25 years newer so it would have to be an improvement, right? Well, they're probably more durable than the old CV's, but they definitely don't sound as good. There is VERY little smooth, low, rich bass from this speaker... I have to turn the volume WAY up to get a fraction of the bass of the old CV's which means that the mids and highs then sound way too loud. I can't be disappointed for $10.99... and yet, I'm disappointed for $10.99... lol.

  • by rocketman9909

    on 10/29/2011


    Overall: 5 out of 5

    these are pretty good, they wont be bouncing your car but if you would like to add some quality bass these are pretty good, seem to take their wattage ratings nicely, and look very clean. the 6 holes is a bit weird but that is ok because making new holes is easy.

  • by djrichyrich

    on 5/4/2011

    great price exceptional sound

    Overall: 4.5 out of 5

    i used these speakers on a project where i built a four way tower speakers and what a surprise ! these are outstanding speakers they have great sound alot of the low end and when they showed up they had a power rating of 400 max instead of the 240 it says here . i dont know if they switched them out because of low stock or its a mis print on the speaker its self but the hit hard i have benn a audiophile for the past 16 yrs and these blow any other cheap replacement i have ever bought .the are just great i have even used them for some of my smaller gigs .all i can say is go mcm they r the best in generic audio.buying to more to run in paralle in my carr so they can run at 4 ohms because my kicker amp is 200 rms bridged at 4 ohms i expect they will sound even better in the car seeing as these seem to have alot of the quaitys that i look for in subs .all i can say is buy these great affordable speakers especialy for those car systems with multipal sub set ups .well have fun speaker it up

  • by tmacpcandaudio

    on 4/22/2011

    Excellent value for money

    Overall: 4.5 out of 5
    Top 25 Contributor

    For the amount of money paid, these are fantastic hole-fillers. I used two of these these along with two 2.5" full range woofers to create a large mono garage speaker. The cabinetry of this speaker was by all means lousy, consisting of a ~2 cubic feet, 5/8" OSB sealed chamber finished in indoor/outdoor carpet, with woofers running full range and the 2.5"s running with a first order 1khz high pass. The woofers blend very will with the 2.5"s, and have very respectable bass, down to about 40hz. The bass is tight and mellow, not at all boomy, and the midrange was also mellow and subdued. I couldn't have asked for a better configuration for this price. MCM never disappoints.

  • by pbdwyer

    on 3/4/2011

    Exceeded expectations

    Overall: 5 out of 5

    Purchased to replace blown drivers in Marantz Tower Speakers. Magnets were heavier and rubber surround superior to the foam originals. Non-ported application has a really nice punch, not boomy. Check the specs 50hz may not be low enough to send tremors but i like the tight punchy bass, oh yea price makes these twice as sweet.

  • by pwalt51312

    on 11/1/2010

    Fantastic Performance

    Overall: 5 out of 5

    I bought a pair of these 12 inch woofers to replace the woofers in a set of JVC SK-1000's. Wow, am I impressed! Don't let the low price of these speakers fool you. Rated at 120 watts RMS, these babies turned out to be superb replacement speakers! What thunderous bass these speakers crank out. I had a CD player sitting on top of one of the JVC SK-1000 boxes and the bass sound it was putting out made the CD I was playing skip!! Well, enough said. I am very pleased with these fine speakers.

  • by Winman99

    on 9/15/2010

    Good for the price

    Overall: 3.5 out of 5
    Top 25 Contributor

    I ordered two of these on Sunday, they were shipped Monday, and arrived Wednesday. That was fast service, way to go MCM! The first thing I noticed when I opened the box was how light the woofers were compared to the originals. Note that the description does state the magnets are only 24 ounce. When I went to put them into the speaker cabinets, I was surprised to find that there are 6 mounting screw holes on the speakers. I've never seen this before, it's always been 4 or 8. I put two screws in the original holes, but had to drill out 4 more. Once installed I gave them a workout. For the price they sound decent, probably better than I expected. That being said, they were put into a semi-expensive set of speakers, and I wish I would have paid more for something better, and probably will down the road. If you're looking for cheap replacements to get an old set of speakers going, these are great, but if you're looking for audiophile sound, fork out the cash for something better.

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