4″ / 102 mm
Nominal diameter
63 Hz
Resonance
0.42
Q factor
85 dB
Sensitivity
± 5 mm
Linear excursion
60 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
85.3
dB
Thiele & Small parameters
Resonance frequency (free air)
fS
63.0
Hz
Mechanical quality factor
QMS
5.40
Electrical quality factor
QES
0.46
Total quality factor
QTS
0.42
Large signal parameters
Maximum linear excursion
xmax
5.0
mm
Air volume displaced at xmax
VD
25
cm³
Power handling
P
30
W
Program power
Pmax
60
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.4
Ω
Inductance (1kHz)
LE
0.34
mH
VC Diameter
25
mm
Winding height
HVC
15
mm
Magnet
Flux density
B
1.07
T
Force factor
Bl
5.5
N/A
Motor constant
Bl/√RE
2.17
N/√W
Air gap height
HAG
5
mm
Weight
0.4
kg
Diaphragm
Effective diameter
80
mm
Effective area
SD
50
cm²
Moving mass
MMS
5.5
g
Moving mass (without air load)
MMD
5.2
g
Suspensions
Stiffness
KMS
0.85
N/mm
Compliance
CMS
1180
µm/N
Equivalent volume to the compliance
VAS
4.2
L
Mechanical resistance
RMS
0.4
N·s/m
Dimensions
Nominal diameter
4
″
102
mm
Volume occupied by the driver (estimated)
0.36
L
Net weight
0.92
kg
Similar speaker drivers to SB Acoustics SB12NRXF25-8
4.75″Mid-range
fS
72 Hz
SD
54 cm²
71 - 4000 Hz
QTS
0.45
SPL1W
85 dB
Bl/√RE
2.25
Pmax
100 W
4″Woofer
fS
65 Hz
SD
50 cm²
65 - 15000 Hz
QTS
0.46
xmax
1.6 mm
SPL1W
85 dB
Bl/√RE
2.23
Pmax
50 W
4″Mid-range
fS
68 Hz
SD
57 cm²
QTS
0.41
xmax
3.0 mm
SPL1W
85 dB
Bl/√RE
2.32
Pmax
300 W