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
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
Discard
Apply
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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SD
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