18″ / 450 mm
Nominal diameter
38 Hz
Resonance
0.31
Q factor
95 dB
Sensitivity
± 10 mm
Linear excursion
1500 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
95.3
dB
Frequency response
25 - 600
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
38.0
Hz
Mechanical quality factor
QMS
4.09
Electrical quality factor
QES
0.34
Total quality factor
QTS
0.31
Large signal parameters
Maximum linear excursion
xmax
10.0
mm
Maximum excursion before damage
xlim
25.0
mm
Air volume displaced at xmax
VD
1029
cm³
Power handling
P
750
W
Program power
Pmax
1500
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.5
Ω
Inductance (1kHz)
LE
2.9
mH
VC Diameter
100
mm
Magnet
Force factor
Bl
25.0
N/A
Motor constant
Bl/√RE
10.7
N/√W
Weight
11.5
kg
Diaphragm
Effective diameter
362
mm
Effective area
SD
1029
cm²
Moving mass
MMS
160
g
Moving mass (without air load)
MMD
135.5
g
Suspensions
Stiffness
KMS
9.09
N/mm
Compliance
CMS
110
µm/N
Equivalent volume to the compliance
VAS
164
L
Mechanical resistance
RMS
9.34
N·s/m
Dimensions
Nominal diameter
18
″
450
mm
Overall diameter
459
mm
Baffle cutout diameter
398
mm
Overall depth
229
mm
Flange thickness
14
mm
Mounting depth
215
mm
Volume occupied by the driver
13.0
L
Net weight
17.0
kg
Frame material
Diecast Aluminum
Similar subwoofers to VOLT RV4504
21″Subwoofer
fS
37 Hz
SD
1662 cm²
25 - 2000 Hz
QTS
0.29
xmax
14.0 mm
SPL1W
96 dB
Bl/√RE
18
Pmax
3600 W
18″Subwoofer
fS
34 Hz
SD
1164 cm²
30 - 800 Hz
QTS
0.27
xmax
11.8 mm
SPL1W
95 dB
Bl/√RE
13
Pmax
2800 W
18″Woofer
fS
36 Hz
SD
1110 cm²
36 - 1000 Hz
QTS
0.31
xmax
9.0 mm
SPL1W
95 dB
Bl/√RE
12
Pmax
2000 W