21 WX Be
8’’ Utopia Be® subwoofer
• Multiferrite magnet
• W cone
Specifications
250 W
500 W
86.5 dB
W
Nominal power
Maximum power
Sensitivity (2.83V/m)
Cone
• For compact closed box
• High power handling
Rubber
4 ohm
3.4 ohm
50 mm
25 mm
Aluminum
2
Surround
Nom. impedance
DC resistance
VC diameter
VC height
2 in
1 in
Former
Layers
Copper
1.13 mH
8.5 mm
15x45 mm
1.3 kg
0.85 T
8 mm
Wire
Inductance
Xmax
0.33 in
0.6 x1.8 in
2.9 Ibs
Magnet (12 units)
Magnet weight
Flux density
Gap height
Net weight
0.31 in
8.8 Ibs
Frequency Response
4 kg
Parameters
Fs
36.63 Hz
18.8 I
Vas
Qts
Qes
Qms
Re
0.6
0.77
2.81
3.4 ohm
208.67 cm2
1.34E-07 m5/N
141.01 kg/m4
11549.11 ohm.ac
3.07E-04 m/N
61.4 g
Sd
Cas
Mas
Ras
Cms
Mms
Rms
Ces
Les
Res
BI
5.029 kg/s
984 mF
Mechanical Drawing
19.19 mH
12.41 ohm
7.9 N/A
SPL
82.63 dB/W/m
Suggested application
Load
V (l)
Fb (Hz)
F-3 (Hz)
43
Ql
Sealed
Sealed
30
-
-
0.77
0.907
15
45
Unit: mm
Focal® is a trademark of Focal-JMlab®
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