Fountek FR58C

Full-range

2.5″ / 58 mm
Nominal diameter
154 Hz
Resonance
1.19
Q factor
83 dB
Sensitivity
± 1.1 mm
Linear excursion
10 W
Program Power
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
Discard
Apply
Sensitivity (1W, 1m, infinite baffle)
SPL1W
83.1
dB
Frequency response
154 - 10000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
154
Hz
Mechanical quality factor
QMS
2.37
Electrical quality factor
QES
2.39
Total quality factor
QTS
1.19

Large signal parameters

Maximum linear excursion
xmax
1.1
mm
Air volume displaced at xmax
VD
2.0
cm³
Power handling
P
5
W
Program power
Pmax
10
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
6.4
Ω
Inductance (1kHz, estimated)
LE
0.09
mH
VC Diameter
21
mm
Winding height
HVC
5.2
mm
Winding material
Copper Clad Aluminium
Former material
Kapton

Magnet

Flux density
B
0.7
T
Force factor
Bl
1.61
N/A
Motor constant
Bl/√RE
0.638
N/√W
Air gap height
HAG
3
mm
Material
Ferrite

Diaphragm

Effective diameter
48
mm
Effective area
SD
18
cm²
Moving mass
MMS
1
g
Moving mass (without air load)
MMD
0.9
g

Suspensions

Stiffness
KMS
0.94
N/mm
Compliance
CMS
1060
µm/N
Equivalent volume to the compliance
VAS
0.493
L
Mechanical resistance
RMS
0.41
N·s/m

Dimensions

Nominal diameter
2.5
58
mm
Overall diameter
61
mm
Overall depth
39
mm
Net weight
0.213
kg
Fountek FR58C SPL & Impedance
Fountek FR58C Dimensions

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