7″ / 174 mm
Nominal diameter
82 Hz
Resonance
0.53
Q factor
92 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
Sensitivity (1w, 1m, infinite baffle)
SPL1W
92.1
dB
Frequency response
80 - 20000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
82.0
Hz
Mechanical quality factor
QMS
5.99
Electrical quality factor
QES
0.59
Total quality factor
QTS
0.53
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
0.14
mH
VC Diameter
39
mm
Magnet
Flux density
B
1.75
T
Force factor
Bl
7.82
N/A
Motor constant
Bl/√RE
2.87
N/√W
Air gap height
HAG
5
mm
Diameter
91
mm
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
Suspensions
Stiffness
KMS
3.8
N/mm
Compliance
CMS
263
µm/N
Equivalent volume to the compliance
VAS
4.15
L
Mechanical resistance
RMS
0.66
N·s/m
Dimensions
Nominal diameter
7
″
174
mm
Overall diameter
174
mm
Baffle cutout diameter
137
mm
Overall depth
105
mm
Flange thickness
9
mm
Mounting depth
96
mm
Volume occupied by the driver (estimated)
0.73
L
Similar speaker drivers to Lowther A45
6″Mid-range
fS
100 Hz
SD
137 cm²
100 - 6000 Hz
QTS
0.53
xmax
2.8 mm
SPL1W
91 dB
Bl/√RE
3.47
Pmax
300 W
7″Full-range
fS
82 Hz
SD
106 cm²
80 - 20000 Hz
QTS
0.41
xmax
1.0 mm
SPL1W
93 dB
Bl/√RE
3.11
Pmax
200 W
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