4″ / 102 mm
Nominal diameter
55 Hz
Resonance
0.28
Q factor
89 dB
Sensitivity
± 2.85 mm
Linear excursion
56 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
88.5
dB
Frequency response
55 - 3500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
55.0
Hz
Mechanical quality factor
QMS
3.69
Electrical quality factor
QES
0.30
Total quality factor
QTS
0.28
Large signal parameters
Maximum linear excursion
xmax
2.85
mm
Air volume displaced at xmax
VD
16
cm³
Power handling
P
28
W
Program power
Pmax
56
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
3.6
Ω
Inductance (1kHz)
LE
0.16
mH
VC Diameter
25
mm
Magnet
Force factor
Bl
7.77
N/A
Motor constant
Bl/√RE
4.1
N/√W
Air gap height
HAG
6
mm
Diaphragm
Effective diameter
85
mm
Effective area
SD
57
cm²
Moving mass
MMS
8.1
g
Moving mass (without air load)
MMD
7.8
g
Suspensions
Stiffness
KMS
0.71
N/mm
Compliance
CMS
1409
µm/N
Equivalent volume to the compliance
VAS
4.84
L
Mechanical resistance
RMS
0.76
N·s/m
Dimensions
Nominal diameter
4
″
102
mm
Volume occupied by the driver (estimated)
0.14
L
Similar subwoofers to Tang Band W4-792SJ
4″Mid-range
fS
68 Hz
SD
50 cm²
QTS
0.31
xmax
3.0 mm
SPL1W
86 dB
Bl/√RE
3.03
Pmax
70 W
4.5″Coaxial
fS
55 Hz
SD
47 cm²
60 - 25000 Hz
QTS
0.30
xmax
3.0 mm
SPL1W
83 dB
Bl/√RE
3.12
Pmax
250 W
4.5″Woofer
fS
53 Hz
SD
52 cm²
50 - 15000 Hz
QTS
0.28
xmax
3.5 mm
SPL1W
85 dB
Bl/√RE
2.68
Pmax
60 W