Beyma 4FR40
Full-range
4″ / 100 mm
Nominal diameter
92 Hz
Resonance
0.89
Q factor
86 dB
Sensitivity
± 3 mm
Linear excursion
80 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
86.1
dB
Frequency response
100 - 20000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
92.0
Hz
Mechanical quality factor
QMS
11.30
Electrical quality factor
QES
0.96
Total quality factor
QTS
0.89
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
4.2
N/A
Motor constant
Bl/√RE
1.66
N/√W
Air gap height
HAG
5
mm
Diaphragm
Effective diameter
84
mm
Effective area
SD
55
cm²
Moving mass
MMS
4.4
g
Moving mass (without air load)
MMD
4.1
g
Suspensions
Stiffness
KMS
1.5
N/mm
Compliance
CMS
668
µm/N
Equivalent volume to the compliance
VAS
2.8
L
Mechanical resistance
RMS
0.23
N·s/m
Dimensions
Nominal diameter
4
″
100
mm
Overall diameter
118
mm
Baffle cutout diameter
92
mm
Overall depth
60
mm
Volume occupied by the driver (estimated)
0.17
L
Net weight
0.55
kg
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SpeakerbenchSimilar speaker drivers to Beyma 4FR40
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5″2 way
fS
92 Hz
SD
97 cm²
80 - 22000 Hz
QTS
0.92
xmax
2.5 mm
SPL1W
87 dB
Bl/√RE
2.19
Pmax
105 W
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5″Mid Bass
fS
89 Hz
SD
98 cm²
80 - 4000 Hz
QTS
0.74
xmax
3.2 mm
SPL1W
87 dB
Bl/√RE
2.27
Pmax
135 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