Fountek FR88EX

Full-range

3.5″ / 88 mm
Nominal diameter
95 Hz
Resonance
0.47
Q factor
84 dB
Sensitivity
± 3 mm
Linear excursion
30 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
83.7
dB
Frequency response
95 - 20000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
95.0
Hz
Mechanical quality factor
QMS
1.96
Electrical quality factor
QES
0.62
Total quality factor
QTS
0.47

Large signal parameters

Maximum linear excursion
xmax
3.0
mm
Air volume displaced at xmax
VD
8.2
cm³
Power handling
P
15
W
Program power
Pmax
30
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
6.0
Ω
Inductance (1kHz)
LE
0.05
mH
VC Diameter
25
mm
Winding height
HVC
4
mm
Winding material
Copper
Former material
Aluminum

Magnet

Flux density
B
0.88
T
Force factor
Bl
3.31
N/A
Motor constant
Bl/√RE
1.35
N/√W
Air gap height
HAG
10
mm
Material
Neodymium

Diaphragm

Effective diameter
59
mm
Effective area
SD
27
cm²
Moving mass
MMS
2.4
g
Moving mass (without air load)
MMD
2.2
g

Suspensions

Stiffness
KMS
0.84
N/mm
Compliance
CMS
1196
µm/N
Equivalent volume to the compliance
VAS
1.27
L
Mechanical resistance
RMS
0.72
N·s/m

Dimensions

Nominal diameter
3.5
88
mm
Overall diameter
88
mm
Overall depth
52
mm
Volume occupied by the driver (estimated)
0.11
L
Net weight
0.35
kg
Fountek FR88EX SPL & Impedance
Fountek FR88EX Dimensions

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Dayton Audio DMA80-4 Full-range
3Full-range
fS
94 Hz
SD
31 cm²
90 - 20000 Hz
QTS
0.41
xmax
2.5 mm
SPL1W
85 dB
Bl/√RE
1.85
Pmax
50 W