4″ / 102 mm
Nominal diameter
65 Hz
Resonance
0.33
Q factor
88 dB
Sensitivity
± 3.4 mm
Linear excursion
50 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
Available on (affiliate link)
Parts Express
$$
Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
88.2
dB
Frequency response
65 - 12000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
65.0
Hz
Mechanical quality factor
QMS
2.21
Electrical quality factor
QES
0.39
Total quality factor
QTS
0.33
Large signal parameters
Maximum linear excursion
xmax
3.4
mm
Air volume displaced at xmax
VD
19
cm³
Power handling
P
25
W
Program power
Pmax
50
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.0
Ω
Inductance (1kHz)
LE
0.13
mH
VC Diameter
25
mm
Magnet
Force factor
Bl
5.24
N/A
Motor constant
Bl/√RE
2.14
N/√W
Air gap height
HAG
6
mm
Diaphragm
Effective diameter
85
mm
Effective area
SD
57
cm²
Moving mass
MMS
4.4
g
Moving mass (without air load)
MMD
4.1
g
Material
Natural color Polypropylene-Mica
Suspensions
Stiffness
KMS
0.73
N/mm
Compliance
CMS
1370
µm/N
Equivalent volume to the compliance
VAS
6.32
L
Mechanical resistance
RMS
0.81
N·s/m
Dimensions
Nominal diameter
4
″
102
mm
Volume occupied by the driver (estimated)
0.14
L
Similar speaker drivers to Tang Band W4-656SC
4″Full-range
fS
60 Hz
SD
57 cm²
60 - 20000 Hz
QTS
0.33
xmax
2.4 mm
SPL1W
89 dB
Bl/√RE
2.16
Pmax
50 W
4″Coaxial
fS
60 Hz
SD
57 cm²
60 - 20000 Hz
QTS
0.34
xmax
0.9 mm
SPL1W
88 dB
Bl/√RE
2.22
Pmax
50 W
5″Woofer
fS
61 Hz
SD
79 cm²
60 - 5000 Hz
QTS
0.30
xmax
3.5 mm
SPL1W
88 dB
Bl/√RE
3.2
Pmax
200 W