4″ / 122 mm
Nominal diameter
78 Hz
Resonance
0.32
Q factor
89 dB
Sensitivity
± 2 mm
Linear excursion
80 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
88.9
dB
Frequency response
78 - 5000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
78.0
Hz
Mechanical quality factor
QMS
6.65
Electrical quality factor
QES
0.34
Total quality factor
QTS
0.32
Large signal parameters
Maximum linear excursion
xmax
2.0
mm
Air volume displaced at xmax
VD
11
cm³
Power handling
P
40
W
Program power
Pmax
80
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.8
Ω
Inductance (1kHz)
LE
0.35
mH
VC Diameter
25
mm
Magnet
Force factor
Bl
6.0
N/A
Motor constant
Bl/√RE
2.49
N/√W
Diameter
90
mm
Diaphragm
Effective diameter
84
mm
Effective area
SD
55
cm²
Moving mass
MMS
4.5
g
Moving mass (without air load)
MMD
4.2
g
Suspensions
Stiffness
KMS
1.16
N/mm
Compliance
CMS
860
µm/N
Equivalent volume to the compliance
VAS
3.7
L
Mechanical resistance
RMS
0.33
N·s/m
Dimensions
Nominal diameter
4
″
122
mm
Overall diameter
122
mm
Baffle cutout diameter
96
mm
Overall depth
66
mm
Flange thickness
6
mm
Mounting depth
60
mm
Volume occupied by the driver (estimated)
0.32
L
Net weight
1.23
kg
Similar woofers to ETON 4-512/C8/25RP
5″Woofer
fS
78 Hz
SD
95 cm²
70 - 6000 Hz
QTS
0.37
xmax
3.9 mm
SPL1W
89 dB
Bl/√RE
3.76
Pmax
250 W
5″Mid Bass
fS
78 Hz
SD
95 cm²
80 - 10000 Hz
QTS
0.30
xmax
5.7 mm
SPL1W
91 dB
Bl/√RE
4.3
Pmax
300 W
4″Full-range
fS
70 Hz
SD
57 cm²
70 - 20000 Hz
QTS
0.34
xmax
2.5 mm
SPL1W
90 dB
Bl/√RE
2.12
Pmax
50 W