Lowther C45
Full-range
7″ / 174 mm
Nominal diameter
82 Hz
Resonance
0.41
Q factor
93 dB
Sensitivity
± 1 mm
Linear excursion
200 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
93.0
dB
Frequency response
80 - 20000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
82.0
Hz
Mechanical quality factor
QMS
5.30
Electrical quality factor
QES
0.45
Total quality factor
QTS
0.41
Large signal parameters
Maximum linear excursion
xmax
1.0
mm
Air volume displaced at xmax
VD
11
cm³
Power handling
P
100
W
Program power
Pmax
200
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
7.4
Ω
Inductance (1kHz)
LE
0.09
mH
VC Diameter
39
mm
Magnet
Flux density
B
1.75
T
Force factor
Bl
8.46
N/A
Motor constant
Bl/√RE
3.11
N/√W
Air gap height
HAG
4
mm
Diameter
115
mm
Material
Feroba 2
Diaphragm
Effective diameter
116
mm
Effective area
SD
106
cm²
Moving mass
MMS
7.6
g
Moving mass (without air load)
MMD
6.7
g
Material
Twin Paper
Suspensions
Stiffness
KMS
2.96
N/mm
Compliance
CMS
338
µm/N
Equivalent volume to the compliance
VAS
5.35
L
Mechanical resistance
RMS
0.74
N·s/m
Dimensions
Nominal diameter
7
″
174
mm
Overall diameter
174
mm
Baffle cutout diameter
137
mm
Overall depth
56
mm
Flange thickness
-11
mm
Mounting depth
67
mm
Volume occupied by the driver (estimated)
0.32
L
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6″Woofer
fS
100 Hz
SD
138 cm²
90 - 4000 Hz
QTS
0.46
xmax
3.9 mm
SPL1W
92 dB
Bl/√RE
4.34
Pmax
350 W
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6.5″Coaxial
fS
97 Hz
SD
154 cm²
100 - 20000 Hz
QTS
0.38
xmax
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SPL1W
93 dB
Bl/√RE
4.23
Pmax
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6″Woofer
fS
98 Hz
SD
138 cm²
100 - 4000 Hz
QTS
0.41
xmax
3.9 mm
SPL1W
92 dB
Bl/√RE
4.81
Pmax
350 W