Fountek FR58EX
Full-range
2.5″ / 58 mm
Nominal diameter
134 Hz
Resonance
0.55
Q factor
82 dB
Sensitivity
± 2.9 mm
Linear excursion
30 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
82.1
dB
Frequency response
130 - 20000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
134
Hz
Mechanical quality factor
QMS
2.60
Electrical quality factor
QES
0.69
Total quality factor
QTS
0.55
Large signal parameters
Maximum linear excursion
xmax
2.9
mm
Air volume displaced at xmax
VD
5.0
cm³
Power handling
P
15
W
Program power
Pmax
30
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.4
Ω
Inductance (1kHz, estimated)
LE
0.13
mH
VC Diameter
20
mm
Winding height
HVC
8.9
mm
Winding material
Copper
Former material
Aluminum
Magnet
Flux density
B
1.16
T
Force factor
Bl
3.89
N/A
Motor constant
Bl/√RE
1.54
N/√W
Air gap height
HAG
3
mm
Material
Neodymium
Diaphragm
Effective diameter
47
mm
Effective area
SD
17
cm²
Moving mass
MMS
1.9
g
Moving mass (without air load)
MMD
1.9
g
Suspensions
Stiffness
KMS
1.36
N/mm
Compliance
CMS
737
µm/N
Equivalent volume to the compliance
VAS
0.315
L
Mechanical resistance
RMS
0.62
N·s/m
Dimensions
Nominal diameter
2.5
″
58
mm
Overall diameter
62
mm
Overall depth
35
mm
Net weight
0.14
kg
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SpeakerbenchSimilar speaker drivers to Fountek FR58EX
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2″Mid-range
fS
165 Hz
SD
15 cm²
400 - 20000 Hz
QTS
0.52
xmax
1.0 mm
SPL1W
82 dB
Bl/√RE
1.48
Pmax
120 W
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2.5″Full-range
fS
117 Hz
SD
17 cm²
200 - 20000 Hz
QTS
0.55
xmax
4.4 mm
SPL1W
81 dB
Bl/√RE
1.62
Pmax
12 W
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2″Full-range
fS
150 Hz
SD
14 cm²
200 - 10000 Hz
QTS
0.49
xmax
2.4 mm
SPL1W
84 dB
Bl/√RE
1.46
Pmax
10 W