12″ / 300 mm
Nominal diameter
28 Hz
Resonance
0.35
Q factor
88 dB
Sensitivity
± 8.5 mm
Linear excursion
1000 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
88.1
dB
Thiele & Small parameters
Resonance frequency (free air)
fS
28.0
Hz
Mechanical quality factor
QMS
5.30
Electrical quality factor
QES
0.37
Total quality factor
QTS
0.35
Large signal parameters
Maximum linear excursion
xmax
8.5
mm
Maximum excursion before damage
xlim
16.0
mm
Air volume displaced at xmax
VD
429
cm³
Power handling
P
500
W
Program power
Pmax
1000
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
3.2
Ω
Inductance (1kHz)
LE
1.1
mH
VC Diameter
50
mm
Winding height
HVC
25
mm
Magnet
Force factor
Bl
14.0
N/A
Motor constant
Bl/√RE
7.83
N/√W
Diaphragm
Effective diameter
254
mm
Effective area
SD
505
cm²
Moving mass
MMS
142
g
Moving mass (without air load)
MMD
133.7
g
Suspensions
Stiffness
KMS
4.46
N/mm
Compliance
CMS
224
µm/N
Equivalent volume to the compliance
VAS
81
L
Mechanical resistance
RMS
4.71
N·s/m
Dimensions
Nominal diameter
12
″
300
mm
Overall diameter
315
mm
Baffle cutout diameter
282
mm
Mounting depth
140
mm
Volume occupied by the driver (estimated)
2.6
L
Similar subwoofers to ESX SX1240
12″Woofer
fS
27 Hz
SD
507 cm²
25 - 800 Hz
QTS
0.31
xmax
6.4 mm
SPL1W
89 dB
Bl/√RE
8.14
Pmax
450 W
12″Subwoofer
fS
25 Hz
SD
500 cm²
25 - 1300 Hz
QTS
0.38
xmax
12.0 mm
SPL1W
88 dB
Bl/√RE
7.59
Pmax
600 W
12″Subwoofer
fS
29 Hz
SD
491 cm²
29 - 450 Hz
QTS
0.40
xmax
9.5 mm
SPL1W
87 dB
Bl/√RE
8.08
Pmax
750 W