MCM Electronics

21'' Die Cast Professional Woofer - 800W RMS By MCM Audio Select (55-2985) MCM Part #55-2985

4 stars 2 reviews
Reg. Price: $139.00
You Save: $27.80 (20 %)

21" Paper Cone Woofer

Low cost general replacement woofer is ideal in a two way cabinets or as a subwoofer. It is perfect for prosound applications and is ideal in sealed enclosures.

Specifications Top

    General Specifications:
    • Nominal Diameter: 21 inch
    • Rated Impedance: 8 ohms
    • Operating Bandwidth: 25Hz ~ 2.5KHz
    • Power Handling Capacity: 800W RMS
    • Sensitivity (1W/M): 99 dB
    • Voice Coil Diameter: 4 inch
    • Overall frame diameter: 21.26"

    Thiele-Small Parameters:
    • Resonance Frequency Fs: 25.9 Hz
    • DC Resistance Re: 6.3ohm
    • Mechanical Q Factor Qms: 3.51
    • Electrical Q Factor Qes: 0.43
    • Total Q Factor Qts: 0.38
    • Equivalent Cas air load Vas: 705.0 liters
    • Voice Coil Over Hang X-max 7mm

    Physical Information:
    • Cutout: 19.69"
    • Mounting Depth: 9.29"
    • Basket: Die cast frame
    • Magnet Type: 100 OZ
    • Cone Material: Treated paper
    • Surround: Cloth
    • Dust Cap: Paper
    • Damper: Cloth

    Part Numbers
    MCM Part #:55-2985
    MCM Audio Select Part #:55-2985
    Package Specifications & Dimensions
    Weight:35.32 lbs.
    RoHS Comp:Yes
    Warranty:365 days
    Need to Return?
    Length:22.5 in.
    Width:22.5 in.
    Height:12.25 in.
    Shipping Information
    Extra Shipping Charge:No
    Drop Ship:No
    Catalog Pages
    MCM Cat 57, Page 153
    MCM Cat 56, Page 276
    View in Catalog

Product Reviews Top

  • by jason tice

    on 6/28/2015

    BIG Disappointment

    Overall: 3 out of 5

    ... I recently bought a pair of these, simply out of curiosity...Throughout the decades, I have seen a LOT of loudspeakers, and done a LOT of rebuilds and seen different build components, as I have been a re-comer for years.....
    As far as the quality of build, these are actually built well for being an import product. The frames are a nice cast aluminum, the cones are REALLY thick and heavy, and magnetic structures are fairly impressive as far as the size....
    I have quite a number of different enclosures, several of which are test boxes and I can simply change baffles to obtain different volumes/alignments/types of enclosures, including folded bass horns with compression chambers.....
    Welp, to get to the point, I've had 15's and 18's that perform better, play louder, have better efficiency, and play deeper than these do....
    Bass tonality of response is quite 'boinky', they have a serious problem with some sort of 'ringing', as well as cone edge resonance issues.... The CONE BODY resonance is REALLY high, so you have a massive bump in response from the 100-300hz range, but don't have much in the 20-80 range, which you would anticipate they would, as they do have an impressive size/perimeter...They're HUGE, they're heavy, and you simply don't get the perform,acne you think you would...The higher end 18's that MCM sells would be better choices if you';re looking for a decent subwoofer.These are more like giant mid-bass speakers.....

  • by allen banezz

    on 3/25/2014

    Air mover.

    Overall: 4.5 out of 5

    I play in a band and DJ some times. These work well with a high powered amp. I made the mistake of using 2 of these 21" with 2 Gem Sound 3950 amps in bridge mono. Well the amps only put out 700 real watts to each woofer and burned one of the V.C. in the center. I bought another one and up graded the power amps to QSC 2450,s in bridge mono and they love it. These are the real deal for dance music. I use the MCM 18" for my live band because kick drum sounds more clear though them, But these 21" shake everything in almost any venue I work in. the 24" x 48" x 36" deep bass horn boxes I have them in weigh over 150 lbs but still vibrate across the dance floor plus I have to strap the mid/high cabs to them so they don't fall off. Power it right and these things are lethal.

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