Lowther A55
Full-range
7″ / 174 mm
Nominal diameter
82 Hz
Resonance
0.36
Q factor
94 dB
Sensitivity
± 1 mm
Linear excursion
200 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
94.1
dB
Frequency response
80 - 22000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
82.0
Hz
Mechanical quality factor
QMS
5.83
Electrical quality factor
QES
0.38
Total quality factor
QTS
0.36
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
0.11
mH
VC Diameter
39
mm
Magnet
Flux density
B
1.98
T
Force factor
Bl
9.71
N/A
Motor constant
Bl/√RE
3.57
N/√W
Air gap height
HAG
5
mm
Diameter
97
mm
Material
Alcomax 3
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
3.72
N/mm
Compliance
CMS
269
µm/N
Equivalent volume to the compliance
VAS
4.25
L
Mechanical resistance
RMS
0.67
N·s/m
Dimensions
Nominal diameter
7
″
174
mm
Overall diameter
174
mm
Baffle cutout diameter
137
mm
Overall depth
110
mm
Flange thickness
9
mm
Mounting depth
101
mm
Volume occupied by the driver (estimated)
0.78
L
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SpeakerbenchSimilar speaker drivers to Lowther A55
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Lowther DX458 Ω
7″Full-range
fS
82 Hz
SD
106 cm²
80 - 20000 Hz
QTS
0.32
xmax
1.0 mm
SPL1W
95 dB
Bl/√RE
3.81
Pmax
200 W
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6″Mid-range
fS
100 Hz
SD
137 cm²
100 - 5000 Hz
QTS
0.34
xmax
2.7 mm
SPL1W
93 dB
Bl/√RE
4.95
Pmax
300 W
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6.5″Mid Bass
fS
100 Hz
SD
130 cm²
200 - 7000 Hz
QTS
0.34
xmax
3.0 mm
SPL1W
95 dB
Bl/√RE
3.9
Pmax
260 W