21 WX Be
8’’ Utopia Be® subwoofer
• Multiferrite magnet |
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• W cone |
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| 250 W |
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• For compact closed box |
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| Nominal power |
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• High power handling |
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| Maximum power | 500 W |
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| Sensitivity (2.83V/m) | 86.5 dB |
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| Cone | W |
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| Surround | Rubber |
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| Nom. impedance | 4 ohm |
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| DC resistance | 3.4 ohm |
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| VC diameter | 50 mm | 2 in |
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| VC height | 25 mm | 1 in |
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| Former | Aluminum |
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| Layers | 2 |
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| Wire | Copper |
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| Inductance | 1.13 mH |
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| Xmax | 8.5 mm | 0.33 in |
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| Magnet (12 units) | 15x45 mm | 0.6 x1.8 in |
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| Magnet weight | 1.3 kg | 2.9 Ibs |
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| Flux density | 0.85 T |
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| Gap height | 8 mm | 0.31 in |
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Frequency Response |
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| Net weight | 4 kg | 8.8 Ibs |
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Mechanical Drawing
- SCFR041108/2 |
Unit: mm |
©FocalJMlab- |
Parameters
| Fs | 36.63 Hz |
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| Vas | 18.8 I |
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| Qts | 0.6 |
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| Qes | 0.77 |
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| Qms | 2.81 |
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| Re | 3.4 ohm |
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| Sd | 208.67 cm2 |
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| Cas |
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| Mas | 141.01 kg/m4 |
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| Ras | 11549.11 ohm.ac |
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| Cms |
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| Mms | 61.4 g |
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| Rms | 5.029 kg/s |
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| Ces | 984 mF |
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| Les | 19.19 mH |
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| Res | 12.41 ohm |
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| BI | 7.9 N/A |
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| SPL | 82.63 dB/W/m |
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Suggested application
Load | V (l) | Fb (Hz) | Ql | |
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Sealed | 30 | - | 43 | 0.77 |
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Sealed | 15 | - | 45 | 0.907 |
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Focal® is a trademark of
108, rue de l'Avenir - BP 374 - 42353 La Talaudière cedex - France - Tel. +33 4 77 43 57 00 - Fax +33 4 77 43 57 04 -