4.75″ / 120 mm
Nominal diameter
58 Hz
Resonance
0.46
Q factor
84 dB
Sensitivity
± 3 mm
Linear excursion
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
83.7
dB
Frequency response
57 - 4000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
57.5
Hz
Mechanical quality factor
QMS
9.30
Electrical quality factor
QES
0.49
Total quality factor
QTS
0.46
Large signal parameters
Maximum linear excursion
xmax
3.0
mm
Air volume displaced at xmax
VD
14
cm³
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.9
Ω
Inductance (1kHz, estimated)
LE
0.25
mH
VC Diameter
25
mm
Winding height
HVC
10
mm
Former material
Black fiber glass
Magnet
Force factor
Bl
5.3
N/A
Motor constant
Bl/√RE
2.18
N/√W
Air gap height
HAG
4
mm
Diameter
90
mm
Weight
0.44
kg
Diaphragm
Effective diameter
78
mm
Effective area
SD
48
cm²
Moving mass
MMS
6.4
g
Moving mass (without air load)
MMD
6.1
g
Material
Kevlar/Carbon fiber
Suspensions
Stiffness
KMS
0.83
N/mm
Compliance
CMS
1200
µm/N
Equivalent volume to the compliance
VAS
3.9
L
Mechanical resistance
RMS
0.25
N·s/m
Dimensions
Nominal diameter
4.75
″
120
mm
Overall diameter
120
mm
Baffle cutout diameter
98
mm
Mounting depth
64
mm
Volume occupied by the driver (estimated)
0.44
L
Net weight
1.1
kg
Frame material
Die cast aluminum
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Similar speaker drivers to Wavecor WF120BD12
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5″Woofer
fS
56 Hz
SD
83 cm²
50 - 1000 Hz
QTS
0.40
xmax
7.0 mm
SPL1W
85 dB
Bl/√RE
3.7
Pmax
160 W
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4″Woofer
fS
60 Hz
SD
53 cm²
60 - 15000 Hz
QTS
0.41
xmax
2.5 mm
SPL1W
84 dB
Bl/√RE
2.25
Pmax
40 W
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