MCM Electronics

8" Woofer with Poly Cone and Rubber Surround 70W RMS at 8ohmMCM Part #: 55-2971  |  MCM Audio Select Part #: 55-2971

8" Woofer with Poly Cone and Rubber Surround 70W RMS at 8ohm 4.4 stars from 19 reviews.
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8" 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

  • Product Description

      General Specifications
      • Nominal Diameter: 8 inch
      • Rated Impedance: 8 ohms
      • Operating Bandwidth: 50Hz ~ 6KHz
      • Power Handling Capacity: 70W RMS
      • Sensitivity (1W/M): 89 dB
      • Voice Coil Diameter: 1 inch
      • Overall frame diameter: 8.00


      Thiele-Small Parameters
      • Resonance Frequency Fs: 28.8 Hz
      • DC Resistance Re: 7.2 ohm
      • Mechanical Q Factor Qms: 3.4
      • Electrical Q Factor Qes: 0.5226
      • Total Q Factor Qts: 0.4529
      • Equivalent Cas air load Vas: 98.26 liters
      • Coil Inductance Le: .5645 mH
      • Efficiency Bandwidth Product EBP 55.1
      • Voice Coil Over Hang X-max 3.5mm


      Physical Information
      • Cutout: 7.17"
      • Mounting Depth: 2.99"
      • Basket: Stamped Steel
      • Magnet Type: 20 OZ
      • Cone Material: Polypropylene
      • Surround: Rubber
      • Dust Cap: Polypropylene
      • Damper: Cloth

    Product Reviews

    • "8 inch Woofer 55-1971" by on 7/22/2014
      Overall: 4.5 out of 5
      Value:
      Quality:

      I had SS-250 two-way unducted Sony speakers, the woofer of one was blown with coil burned out (very fine wire), and not reparable. These speakers, from the seventies, were too low in power by current standards, and hence subject to further failure by accident if replaced as manufactured. The handmade wooden cabs were very sturdy, attractive, not vinyl clad, hard to make yourself, and I didn't want to throw them out. One slight problem was that 6-1/2" sized woofers were a rarity at higher power. These woofers seemed to be perfect, except I had to cutout baffle to fit the 8", which, luckily fit the cabs. They offer a max of 140 Watts, impossible to blow with standard equipment, and they, with larger diameter, sound much stronger for bass than the frail originals, which operating at only 20 watts, were limited. So far I have noticed very little crossover problem, and these serve as bass and very good mid-range with no flat spots that I can notice. I also updated to 18 gauge wire soldered within for durability free of oxidation. The original wire was 20 feet of very fine wire with phono pins terminating. Recommend these for an inexpensive satisfactory replacement.

    • "great speaker" by soldier77 on 2/13/2014
      Overall: 3 out of 5
      Value:
      Quality:

      I got a pair a month ago and after they broke in they make pretty efficient bass . I replaced the woofer in EPI 100 with these. Great results. Also put mcm twoway crossover and mcm softdome tweeter in them and they sound great . MCM did it again for me. My buddy who is a a udiophile cant believe the sound for what i paid.

    • "No low bass" by randall klingerman on 2/11/2014
      Overall: 3 out of 5
      Value:
      Quality:

      The material and workmanship of this speaker is excellent. DO NOT install this speaker in a small enclosure

    • "The Thiele-Small parameters are wrong" by MIAgeek on 1/6/2014
      Overall: 3.5 out of 5
      Value:
      Quality:

      I bought these because the Thiele-Small parameters looked really good compared to the 55-1190 drivers and at half the price. The 55-1190 parameters measured close to MCM’s measurements but for these drivers, they are way off. Vas is 13.6 L; Fs is 61 Hz; Qt is 1.13. Comparing the rubber surrounds of each driver, these seemed to have a much thicker surround making it more massive and stiffer. This explains much of the difference between these two drivers. Maybe a change was made to the rubber surround after the measurements were made. If you built a 2 cubic foot cabinet using the given parameters and the right design formulas, you would tune the box to 34.3 Hz and the response would be down 3dB at 29 Hz with a peak in the bass of 4.5 dB at 77 Hz. If you used the corrected parameters, the box frequency would be just 3 Hz higher or 37 Hz. Down 3db at 30 Hz with a peak of 4.9 dB at 75 Hz. So, the good news is that despite the big difference in specs, the end result is close. Tuning to 37 Hz gives a better overall response. I built them pairing them with 53-805 - 3" x 7" Piezo Horn Tweeter. I put a 100 ohm resistor across the tweeter and a 51 ohm and 0.68 uFd in series to attenuate the tweeter 3.5 dB. The cap value is not critical, it just keeps all the low frequencies from heating up the resistors. Hey, they sound darn good for 20 bucks for drivers for a pair. They will not impress an audiophile but most of your friends would think they bump. Turn the bass down a few dB. If these are put into a 2 cu ft sealed box, the results expected from the published parameters would be tight, well damped lows. You would not get that at all. A 0.5 cu ft box is too small for deep, clean bass but it would be close to what you would expect. I give them 2 stars because the specs are wrong and they can’t be used in a sealed box. Here is a nice link--- http://www.carstereo.com/help/Articles.cfm

    • "Ordered a set of these to bring back some ported bookshelf speakers" by mcsonline8675309 on 7/11/2013
      Overall: 5 out of 5
      Value:
      Quality:

      End result far exceeded expectations. Replaced some woofers in pair of bookshelf speakers and no one believes me when I tell them MCM got me these to my door for under a 20. You cannot go wrong.

    • "Great designs" by mrtimelord on 1/11/2013
      Overall: 5 out of 5
      Value:
      Quality:

      This is a well made fantastic product and from my 30 years as a builder,designer and retailer most other compararable sized drivers that claim to be better are over rated. Most other materials for cones also come with particular drawbacks, usualy peaks from ringing cones. This looks likely for all sizes of this design it,s an exact copy of the one I designed and was having Rockford/Fosgate manufacture for me in the early 90's Doesn't really get any better unless you have specific different needs

    • "Quality 8" replacement speaker" by showhorse on 12/24/2012
      Overall: 5 out of 5
      Value:
      Quality:

      quality speaker at a reasonable price. Great performance, sounded even better than the speaker OEM speaker/

    • "55-2971 - 8" Woofer with Poly Cone and Rubber Surround" by atltech2000 on 8/31/2012
      Overall: 5 out of 5
      Value:
      Quality:

      Great inexpensive woofer for general replacement.I will buy them again!

    • "More than I bargained for" by dwayne.newton1 on 8/22/2012
      Overall: 5 out of 5
      Value:
      Quality:
      Top 25 Contributor

      I had to double-check the product details on the website because I got a couple of these and the specs don't match up. The box they came in and the sticker on the back both indicate a maximum power handling of 200 watts. Not that I'm complaining. They are very well behaved in a .50 cubic foot sealed box, although a larger box may offer more substantial bass response. If you want lots of thump and boom this isn't what you want, but if you like tight, snappy bass that gets reasonably low this does quite well. I think this could also serve as a decent midwoofer in a 4-way system or as a midrange driver in a large 3-way setup.

    • "These are great" by rocketman9909 on 8/13/2012
      Overall: 5 out of 5
      Value:
      Quality:

      I custom built a sealed bass cabinet for 4 of these based on the specs provided by MCM so when these arrived I just popped them in and cranked it up, these are great value, of course better speakers exist but not for this price and not with this bang for your buck, for anything from filling that 8 inch hole in your cabinet to mid level 8 inch woofer this is great.

    • "Boston Acoustics A60 replacements!" by nonsuchpro on 8/12/2012
      Overall: 5 out of 5
      Value:
      Quality:

      These worked out great for a set of Boston Acoustic A60 bookshelf speakers. Did not need to change the crossover. Can't go wrong at this price.

    • "ALL SMILES" by sansui on 6/2/2012
      Overall: 4.5 out of 5
      Value:
      Quality:

      Suprised and pleased, not an expert but this woofer looks great and sounds plenty nice, sealed 2 way cab with MCM's crossovr board 60-10565, old school amp helps of course - Sansui R50 ,, great buy !!!

    • "excellent" by D.J.RSB666 on 5/9/2012
      Overall: 4.5 out of 5
      Value:
      Quality:

      excellent quality for money i got 4 to build 2 new tower speakers

    • "double charge" by y2k42y2k on 2/14/2012
      Overall: 3 out of 5
      Value:
      Quality:

      woofer was good but mcm double charge me for shipping

    • "8-INCH WOOFER" by HANDJACK on 1/10/2012
      Overall: 4 out of 5
      Value:
      Quality:

      GOOD SOUNDING WOOFER FOR THE MONEY.

    • "woofer replacement" by vacantmind on 12/16/2011
      Overall: 4.5 out of 5
      Value:
      Quality:

      I got these to replace a home made speaker box, the old woofers dry rotted, good replacment for the money. Not as low in the freq responce as the old ones, but sound pretty good. will use to replace other speakers in future.

    • "Does the job well" by rbmango on 11/16/2011
      Overall: 4.5 out of 5
      Value:
      Quality:

      Nice low cost replacement speaker for some old TOAs that did not need top of the line. Maybe better sounding than original. Very pleased to have the speakers work with minimal cost.

    • "a great deal" by eightinchwoofer on 8/4/2011
      Overall: 4.5 out of 5
      Value:
      Quality:

      Bought 2 of these for use in a low cost speaker system for the basement. Purchased because price was so low. I wasn't expecting much other than to fill an eight inch hole. Wow, was I ever surprised. They sound fantastic. Driving them with a vintage 46 watt Marantz receiver. Couldn't be happier. And MCM's shipping was like instantaneous. I'll be back for more!

    • "WoW" by mad2459 on 4/2/2011
      Overall: 4.5 out of 5
      Value:
      Quality:

      What a great buy used them to replace a twenty year old set of drivers that dry rotted. Their in bass reflex cabinet using 100 amp sony surrond reciever. Great performers can't say enough. Poly cone, rubber surrond, vented voice coil. Was worried about voice coil size and magnet. but there is no complaints here.

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    Package Specifications & Dimensions
    Weight:2.9 lbs.
    Hazardous:Yes
    RoHS Comp:Yes
    Warranty:365 days
    Need to Return?
    Length:8.5 in.
    Width:8.5 in.
    Height:4 in.
    Shipping Information
    Extra Shipping Charge:No
    Drop Ship:No
    Catalog Pages
    Catalog/Page:

    MCM Cat 57, Page 162

    MCM Cat 56, Page 288

    PDF Reference
    Datasheet

    Requires Adobe Acrobat Reader.

    Mfr. Info

    MCM Audio Select Logo
    Mfr. Name:MCM Audio Select
    Mfr. Part Number:55-2971