Focal AUDITOR RSB 250
Subwoofer
10″ / 271 mm
Nominal diameter
29 Hz
Resonance
0.59
Q factor
84 dB
Sensitivity
500 W
Program Power
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Sensitivity (1W, 1m, infinite baffle)
SPL1W
84.3
dB
Frequency response
35 - 500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
29.0
Hz
Mechanical quality factor
QMS
4.70
Electrical quality factor
QES
0.68
Total quality factor
QTS
0.59
Large signal parameters
Power handling
P
250
W
Program power
Pmax
500
W
Voice Coil
Nominal impedance
Z
2 x 4
Ω
DC resistance (in series)
RE
6.4
Ω
Inductance (1kHz, in series, estimated)
LE
1.41
mH
VC Diameter
50
mm
Magnet
Force factor (in series)
Bl
13.4
N/A
Motor constant
Bl/√RE
5.3
N/√W
Diameter
140
mm
Diaphragm
Effective diameter
198
mm
Effective area
SD
307
cm²
Moving mass
MMS
93
g
Moving mass (without air load)
MMD
88.8
g
Material
Polypropylene
Suspensions
Stiffness
KMS
3.33
N/mm
Compliance
CMS
300
µm/N
Equivalent volume to the compliance
VAS
42
L
Mechanical resistance
RMS
3.61
N·s/m
Surround material
Butyl
Dimensions
Nominal diameter
10
″
271
mm
Overall diameter
271
mm
Baffle cutout diameter
233
mm
Mounting depth
117
mm
Volume occupied by the driver (estimated)
1.4
L
Net weight
3.4
kg
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fS
32 Hz
SD
471 cm²
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QTS
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xmax
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SPL1W
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Bl/√RE
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Pmax
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fS
32 Hz
SD
471 cm²
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QTS
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xmax
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SPL1W
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