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21 cm bass speaker with Sandwich membrane. The loudspeaker incorporates a neodymium magnet system. The coil is vented.
RMS power = 150 W
Frequency range = 31-1000 Hz
Resonance frequency = 21 Hz
Impedance = 6 Ohm
Sound pressure level SPL = 91.5 dB (2.83V; 1m)
DC resistance Re = 6.7 Ohm
Force factor BL = 11.5 N / A
Coil inductance L = 0.42 mH
Effective membrane area Sd = 224 cm2
Displaced mass. Air load included mms = 30 g
Equivalent volume of compliance Vas = 139 l
Total quality factor Qts = 0.2 (Qms = 4.4, Qes = 0.21)
Coil diameter = 55 mm
Linear excursion xlin = +/- 5 mm
Mounting diameter d = 190.5 mm
Diameter / Overall dimensions d = 220 mm
Mounting depth (not countersunk) t = 107 mm
Weight = 3.8 kg
Vented box design parameters:
- Vb: 30L, Fres: 23Hz with passive radiator, -12dB @ 25Hz, Q: 0.47 (optimal A/V alignment)
- Vb: 25L, Port diameter: 70mm, Length: 230mm, Fres: 40Hz, F-3dB: 43Hz, Q: 0.50
- Vb: 40L, Port diameter: 70mm, Length: 155mm, Fres: 37Hz, F-3dB: 37Hz, Q: 0.43 (extended bass)
Closed Box design parameters:
- Vb: 12L, -11dB @ 40Hz, F-3dB: 69Hz, Q: 0.71 (typical)
- Vb: 25L, -8dB @ 40Hz, F-3dB: 70Hz, Q: 0.50 (extended bass)
1240100002
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