MCM Electronics

21'' Die Cast Professional Woofer - 800W RMSMCM Part #: 55-2985  |  MCM Audio Select Part #: 55-2985

21'' Die Cast Professional Woofer - 800W RMS 4.5 stars from 1 review.
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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.

Product Description

    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

Product Reviews

  • "Air mover." by allen banezz on 3/25/2014
    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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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

PDF Reference

Requires Adobe Acrobat Reader.

Mfr. Info

MCM Audio Select Logo
Mfr. Name:MCM Audio Select
Mfr. Part Number:55-2985