WC21W-4A
Key Features:
  • 21" (533 mm) Subwoofer, 4 ohm edge wound coil 800 watts
  • Ferrite magnet, treated paper cone with accordion cloth edge
  • Dual 8" spider suspension
  • Round cast aluminum basket
  • Low-distortion aluminum faraday ring with vented T Pole design (for low distortion)

Primary Specifications

Speakers Environment Indoor
ROHS Compliant Yes

Technical Specifications

UNIT of MEASURE
Nominal Basket Diameter 21.0 / 533.0 inch / mm
Rated Impedance 4 ohms
Rated Power 800.0 Watts
Program Power 800 Watts
Frequency Range 20- 500 Hz
Sensitivity
(2.83 V input measured at 1 Meter)
95 dB SPL
Voice Coil Diameter 4.0 / 101.6 inch / mm
Magnet Weight 110.0 / 3124 oz / gr
Transformer

Small Signal Parameters

UNIT of MEASURE
Resonant Frequency (fo) 30 Hz
D.C. Resistance (Re) 3.6 ohms
Mechanical Q (Qms) 9.0
Electrical Q (Qes) 0.6
Total Q (Qts) 0.56
Compliance Equivalent Volume (Vas) 385.0 ltr
BL Product (BL) 18.5 T-M
Maximum Linear Excursion (Xmax) 7.4 mm
Surface Area of Cone (Sd) 1735.0 cm2
Moving Mass (Mmd) g

Material Descriptions

 
Basket Cast Aluminum
Terminal Size Gold Terminal Posts
Magnet Ferrite
Voice Coil Wire Copper
Voice Coil Form Til
Cone Paper
Cone Edge Cloth
Dust Cap Paper
http://s3.amazonaws.com/misco/curves/WC21W-4A.JPG
ID Description Measurements Tolerance
OD Outside Diameter 21.1 in. +/- 0.040”
CD Cutout Diameter 19.2 in. +/- 0.030”
MG Magnet Diameter 8.4 in. +/- 0.050”
HD Hole Diameter 0.26 in. +/- 0.020”
MD Mounting Diameter 20.9 in. +/- 0.020”
ID Internal Depth 2.4 in. Maximum
FT Flange Thickness 0.4 in. +/- 0.050”
NW Net Weight 3125.0 g
ceramic