ESX SX840

Subwoofer

8″ / 200 mm
Nominal diameter
35 Hz
Resonance
0.38
Q factor
86 dB
Sensitivity
± 3.5 mm
Linear excursion
600 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
86.0
dB

Thiele & Small parameters

Resonance frequency (free air)
fS
35.0
Hz
Mechanical quality factor
QMS
4.90
Electrical quality factor
QES
0.41
Total quality factor
QTS
0.38

Large signal parameters

Maximum linear excursion
xmax
3.5
mm
Maximum excursion before damage
xlim
13.0
mm
Air volume displaced at xmax
VD
75
cm³
Power handling
P
300
W
Program power
Pmax
600
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
15
mm
Former material
Aluminium

Magnet

Force factor
Bl
9.5
N/A
Motor constant
Bl/√RE
5.31
N/√W
Diameter
110
mm
Height
40
mm
Weight
1.361
kg

Diaphragm

Effective diameter
165
mm
Effective area
SD
214
cm²
Moving mass
MMS
53
g
Moving mass (without air load)
MMD
50.6
g
Material
Non-pressed Paper

Suspensions

Stiffness
KMS
2.6
N/mm
Compliance
CMS
385
µm/N
Equivalent volume to the compliance
VAS
25
L
Mechanical resistance
RMS
2.38
N·s/m
Surround material
Rubber
Spider material
Single Nomex

Dimensions

Nominal diameter
8
200
mm
Overall diameter
218
mm
Baffle cutout diameter
189
mm
Mounting depth
114
mm
Volume occupied by the driver (estimated)
2.1
L
Net weight
4.9
kg
Frame material
Diecast Aluminium

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