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
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
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
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
Similar speaker drivers to Fountek FR58C
2.5″Full-range
fS
160 Hz
SD
22 cm²
100 - 20000 Hz
QTS
1.10
xmax
2.0 mm
SPL1W
84 dB
Bl/√RE
1.1
Pmax
40 W
2.6″Full-range
fS
157 Hz
SD
21 cm²
157 - 20000 Hz
QTS
0.99
xmax
0.5 mm
SPL1W
83 dB
Bl/√RE
1.13
Pmax
15 W
2″Mid-range
fS
145 Hz
SD
16 cm²
145 - 20000 Hz
QTS
1.07
xmax
1.4 mm
SPL1W
82 dB
Bl/√RE
1.07
Pmax
20 W