18″ / 460 mm
Nominal diameter
42 Hz
Resonance
0.58
Q factor
95 dB
Sensitivity
± 7.25 mm
Linear excursion
800 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
95.2
dB
Frequency response
40 - 4000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
42.0
Hz
Mechanical quality factor
QMS
5.50
Electrical quality factor
QES
0.65
Total quality factor
QTS
0.58
Large signal parameters
Maximum linear excursion
xmax
7.25
mm
Maximum excursion before damage
xlim
15.0
mm
Air volume displaced at xmax
VD
834
cm³
Power handling
P
400
W
Program power
Pmax
800
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.3
Ω
Inductance (1kHz)
LE
1.1
mH
VC Diameter
77
mm
Winding height
HVC
17.5
mm
Magnet
Force factor
Bl
18.3
N/A
Motor constant
Bl/√RE
7.29
N/√W
Air gap height
HAG
7
mm
Diaphragm
Effective diameter
383
mm
Effective area
SD
1150
cm²
Moving mass
MMS
130
g
Moving mass (without air load)
MMD
102.3
g
Suspensions
Stiffness
KMS
9.09
N/mm
Compliance
CMS
110
µm/N
Equivalent volume to the compliance
VAS
206
L
Mechanical resistance
RMS
6.2
N·s/m
Dimensions
Nominal diameter
18
″
460
mm
Volume occupied by the driver (estimated)
3.1
L
Net weight
7.0
kg
Similar subwoofers to Beyma SM-118/N
15″Woofer
fS
43 Hz
SD
855 cm²
40 - 3000 Hz
QTS
0.53
xmax
4.3 mm
SPL1W
97 dB
Bl/√RE
5.56
Pmax
400 W
15″Bass Guitar Speaker
fS
40 Hz
SD
855 cm²
40 - 4000 Hz
QTS
0.53
xmax
4.3 mm
SPL1W
96 dB
Bl/√RE
5.56
Pmax
400 W
18″Low frequency
fS
41 Hz
SD
1225 cm²
35 - 1000 Hz
QTS
0.52
xmax
5.3 mm
SPL1W
96 dB
Bl/√RE
9.07
Pmax
2000 W