Beyma 4FR40Nd
Full-range
4″ / 100 mm
Nominal diameter
94 Hz
Resonance
0.73
Q factor
86 dB
Sensitivity
± 3 mm
Linear excursion
80 W
Program Power
Discontinued
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
86.4
dB
Frequency response
100 - 20000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
94.0
Hz
Mechanical quality factor
QMS
10.80
Electrical quality factor
QES
0.78
Total quality factor
QTS
0.73
Large signal parameters
Maximum linear excursion
xmax
3.0
mm
Air volume displaced at xmax
VD
17
cm³
Power handling
P
40
W
Program power
Pmax
80
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.4
Ω
Inductance (1kHz)
LE
0.2
mH
VC Diameter
20
mm
Winding height
HVC
7.7
mm
Magnet
Force factor
Bl
4.7
N/A
Motor constant
Bl/√RE
1.86
N/√W
Air gap height
HAG
4
mm
Material
Neodymium
Diaphragm
Effective diameter
84
mm
Effective area
SD
55
cm²
Moving mass
MMS
4.5
g
Moving mass (without air load)
MMD
4.2
g
Suspensions
Stiffness
KMS
1.6
N/mm
Compliance
CMS
627
µm/N
Equivalent volume to the compliance
VAS
2.7
L
Mechanical resistance
RMS
0.25
N·s/m
Dimensions
Nominal diameter
4
″
100
mm
Volume occupied by the driver (estimated)
0.1
L
Net weight
0.28
kg
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4″Mid-range
fS
92 Hz
SD
68 cm²
92 - 10000 Hz
QTS
0.60
xmax
2.3 mm
SPL1W
87 dB
Bl/√RE
2.25
Pmax
60 W
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4″Mid-range
fS
90 Hz
SD
57 cm²
90 - 5000 Hz
QTS
0.68
xmax
2.9 mm
SPL1W
87 dB
Bl/√RE
1.8
Pmax
60 W
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4″Full-range
fS
100 Hz
SD
52 cm²
90 - 20000 Hz
QTS
0.83
xmax
2.7 mm
SPL1W
86 dB
Bl/√RE
1.53
Pmax
60 W