Beyma SM-118/N

Woofer

18″ / 460 mm
Nominal diameter
42 Hz
Resonance
0.58
Q factor
95 dB
Sensitivity
± 7.25 mm
Linear excursion
800 W
Program Power
Discontinued
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
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
Material
Ferrite

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
Beyma SM-118/N Impedance
Beyma SM-118/N SPL & Distortion
Beyma SM-118/N Dimensions

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