MCM Electronics

8'' High Excursion Woofer - 120W RMS 4ohmMCM Part #: 55-2421  |  MCM Audio Select Part #: 55-2421

8'' High Excursion Woofer - 120W RMS 4ohm 4.5 stars from 16 ratings and 15 reviews.
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8" High Excursion Woofer

This high performance woofer features extremely long throw design for outstanding low frequency response, thought impossible of drivers this size. Optimized for vented enclosures, it is great for home theater or autosound applications, as a compact subwoofer, or as a woofer in a three–way design.

Product Description

Features

  • Rigid lightweight paper cone
  • Treated foam surround
  • Bumped magnet and vented pole piece
  • Heavy duty stamped steel basket
Specifications
  • Power capacity: 120W/240W RMS/peak
  • Frequency response: 25Hz ~ 1KHz
  • Nominal impedance: 4Ω
  • Voice coil diameter: 2"
  • Magnet weight: 47oz.
  • Sensitivity: 87dB W/M
  • Fs: 25.7Hz
  • Re: 3.4Ω
  • Le: 2.47mH
  • Qms: 14.0
  • Qes: 0.22
  • Qts: 0.22
  • Vas: 30.43 liters
  • Mms: 59.78g
  • Xmax: 8mm (one-way)
  • Magnet gap height: 8mm
  • BL: 12.99
  • Piston diameter: 163mm
Dimensions
  • Overall frame diameter: 8.25"
  • Required cutout: 7.125" diameter
  • Mounting depth: 4.5"

Product Reviews

  • "You get what you pay for" by eastmtmike on 2/18/2014
    Overall: 2.5 out of 5
    Value:
    Quality:

    I have two tapped horns each loaded with two of these woofers. They sound great for about an hour of moderately loud music. After that the burning smell begins. I have gone through 8 of these woofers. The cone detaches from the spider and they're toast. I will be upgrading to something with a little more power handling. For what they cost you can't beat these, they're just not for me. On the other hand, I had nothing but great experience with MCM customer service.

  • "Wish I knew about this driver before...!" by TheGDog on 10/29/2013
    Overall: 5 out of 5
    Value:
    Quality:

    This driver replaced a Kicker Comp 8" I originally used in a TLine enclosure for my home theater application. This driver having a much lower Qts value and Fs value lends itself much better to getting excellent lows. Just swapped-out the driver today. Wish I'd known about this company and this driver earlier so I could have saved money AND gotten the better woofer for the job right from the get go! I originally purchased this driver with intent to build an AutoTuba folded horn. After my free-air listen I got impatient to check this lil guy out. No doubt in my mind I will buy another one of these to build the AutoTuba.

  • "Good 8" Woofer" by seanmcguire on 10/10/2013
    Overall: 4.5 out of 5
    Value:
    Quality:

    I experimented with making clones of the JBL 2800 model. The 2421 is good in a 2-way design, but would be better with a lower frequency tweeter than the Ultra 1230 (crossed @ 2.5kHz), or a 3-way with a little more help in the upper midrange. These are power hungry! I could see these handling 200w clean power daily. The sensitivity and range is nowhere near as good as the JBL 508, and not as crisp either (DUH!). I tuned the ports to 25Hz with satisfactory results, not subsonic bass, but it will quietly fart out the lows and play nicely up through the lower mids. The 2421 will tear up a small box and move it across the room, so do give it PLENTY of volume - 1.0746 ft3 is probably the MINIMUM MCM calculated for these. Give these plenty of time to break-in as well, and the paper cones will sweeten up. I am impressed with what this woofer can do, especially for the price and the crappy job I gave it to do.

  • "8" subwoofer" by nigelrajah on 11/12/2012
    Overall: 5 out of 5
    Value:
    Quality:

    This sub thumps! No midbass coloration. I like it. May have to buy two more for the home speakers.

  • "8" Long Throw Woofer" by decampo on 9/19/2012
    Overall: 5 out of 5
    Value:
    Quality:

    Great woofer for 8". The long excursion means it moves more air than another 8", with a shorter throw. In a ported box it will play the lowest frequencies as clearly as a much larger woofer, without taking up the room a larger woofer in a larger box would. Great for sub, or 2 or 3 way speakers. Home or automotive. Just a great combination of features, to make a variety of possible builds, and also replacements for your old 8" woofers. Just about guaranteed to be an upgrade. If they are on sale, grab a couple like I did. Check your mounting depth, they sport a giant magnet!

  • "omg it pounds" by D.J.RSB666 on 5/17/2012
    Overall: 5 out of 5
    Value:
    Quality:

    excellent quality for money with a 200watt sub amp 50-6263

  • "Boom" by MarleyMarl on 1/13/2012
    Overall: 5 out of 5
    Value:
    Quality:

    Great sound, deep bass. Made a big difference in my surround sound. Great vaule great price.

  • "Nice Little Sub" by Perfecto57 on 5/25/2011
    Overall: 2.5 out of 5
    Value:
    Quality:

    Ok, so I got this little work horse back in December for a car audio application and I was very happy with the performance of this speaker. However, after just 3 1/2 months of use it failed on me. I think next time I'm going to go with another brand for a replacement sub. Not quite durable enough for me. -Jeff

  • "Extraordinary Bass" by Odougbow on 12/13/2010
    Overall: 5 out of 5
    Value:
    Quality:

    Extraordinary bass - use two woofers in an Isobaric design box (face to face). For example, construct a simple, slotted box: 11”W x 14- 3/4D x 18-1/4" T (outside dimensions) - using ¾” MDF. Install a 3/4" slot port at the bottom, 9-1/2”W x 10-3/4”D (inside dimensions). This will tune the box at 31 hz. Space the woofers 1/2" apart so they have plenty of room to move, wire the speakers in series (8ohm) and use a MCM 200 watt plate amplifier. No need for damping material. I have built two of these cabinets and the results are amazing, the lowest and most detailed bass that I have ever heard. This design will astonish any home theater enthusiast, even if they have sub-woofers that cost much much more.

  • "Great woofer - great price." by jcmbowman on 3/15/2010
    Overall: 5 out of 5
    Value:
    Quality:

    I bought this woofer for a horn-loaded car subwoofer (An Autotuba designed by Bill Fitzmaurice, to be specific) and was amazed at the output of this box. It went over so well that my wife stole mine until I built a second one for her car. I love the look on people's faces when I explain that all I've got running is a 100 watt 8" driver that cost less than $50. It replaced a dual-10" loaded sealed box that cost $600 altogether and used 1200 watts. And the new box is louder and cleaner. Awesome driver.

  • "MCM 55-2421 Tapped Horn system" by tsloms on 1/9/2010
    Overall: 5 out of 5
    Value:
    Quality:

    I purchased this sub to build a tapped horn enclosure for it. I am using a cheap 115W amp to power it in a tapped horn enclosure about 2 cubic feet in size. This system by itself is powerful enough to hang with most 10" and 12" subs in much larger enclosures. For the price this sub cannot be beat.

  • "Very Powerful Woofer" by Odougbo on 12/16/2009
    Overall: 5 out of 5
    Value:
    Quality:

    I was impressed with this woofer in a 2 cubic foot ported enclosure tuned to 30 htz and a MCM 200 watt amplifier, the bass bubbles down extremely low. However, I decided to try two woofers face to face in a 1 cubic ported enclosure (excluding the slotted port, again tuned to 30htz). The results are incredible, tremendously low, powerful bass. I did switch to a 200 watt stereo amp set in a bridged mode. Speakers are connected in series so the speaker load is 8 ohms. This speaker has a noticeably smooth response from 25htz – to 100htz. A wonderful speaker and a great value, I may try the cast iron version next.

  • "Surprised" by hooviemoto87 on 2/8/2009
    Overall: 4.5 out of 5
    Value:
    Quality:

    I installed this 8" woofer in a Toyota RAV4. I mounted it in a .24 cu. ft. ported enclosure (along with an 8" grill MCM 50-525 and matching blue carpet). It was hard installing a 13" port in that small of a box, but it was worth it! I powered this woofer with a Power Acoustik OV2-420 car amplifier. Let me tell you, this speaker surprised me after I installed it. It handles the 190 watts RMS well and complemented the stock speaker system well. I couldn't believe you could hear the woofer outside the RAV4. The stock system had too much midbass, so to balance it out, I turned down the bass knob and turned up the subwoofer. I would argue that this sub has better sound quality and more deep bass than some more expensive subs that I have heard that require much larger boxes. Why would you take up your whole cargo area when you can build a box the size of a sheet of paper? Only complaint I have is the paper cone. Hopefully it holds up to the elements and 140 degree heat. Great Speaker.

  • "outstanding" by chwojdak on 5/14/2008
    Overall: 5 out of 5
    Value:
    Quality:

    The high excursion along with the low Fs made this driver in a 1 cu ft enclosure outperform larger subs I have built. This guy and your 100watt module for less than $100 will wipe out way more expensive units.

  • "Part of good <$100 sub for home theater" by pemrich on 11/23/2007
    Overall: 3.5 out of 5
    Value:
    Quality:

    Great small vented design from AudioXpress produces outstanding crisp clear bass using the speaker and an MCM subamp like the 50-6272. Really shakes the floor. I built several of these, one speaker failed after a year, thus the low quality rating. Wait for these to go on sale for <$25 and the amps for ~$50, that's value!

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Package Specifications & Dimensions
Weight:8.57 lbs.
Hazardous:Yes
RoHS Comp:Yes
Warranty:365 days
Need to Return?
Length:9 in.
Width:9 in.
Height:8.6 in.
Shipping Information
Extra Shipping Charge:No
Drop Ship:No
Catalog Pages
Catalog/Page:

MCM Cat 57, Page 161

MCM Cat 56, Page 286

PDF Reference
Datasheet

Requires Adobe Acrobat Reader.

Mfr. Info

MCM Audio Select Logo
Mfr. Name:MCM Audio Select
Mfr. Part Number:55-2421