8″ / 220 mm
Nominal diameter
34 Hz
Resonance
0.27
Q factor
90 dB
Sensitivity
± 4 mm
Linear excursion
300 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
89.9
dB
Frequency response
30 - 3000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
34.0
Hz
Mechanical quality factor
QMS
5.04
Electrical quality factor
QES
0.29
Total quality factor
QTS
0.27
Large signal parameters
Maximum linear excursion
xmax
4.0
mm
Maximum excursion before damage
xlim
12.5
mm
Air volume displaced at xmax
VD
86
cm³
Power handling
P
150
W
Program power
Pmax
300
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.5
Ω
Inductance (1kHz)
LE
0.9
mH
VC Diameter
38
mm
Magnet
Force factor
Bl
11.0
N/A
Motor constant
Bl/√RE
4.69
N/√W
Weight
3.6
kg
Diaphragm
Effective diameter
165
mm
Effective area
SD
214
cm²
Moving mass
MMS
29
g
Moving mass (without air load)
MMD
26.5
g
Suspensions
Stiffness
KMS
1.43
N/mm
Compliance
CMS
700
µm/N
Equivalent volume to the compliance
VAS
47
L
Mechanical resistance
RMS
1.23
N·s/m
Dimensions
Nominal diameter
8
″
220
mm
Overall diameter
235
mm
Baffle cutout diameter
200
mm
Overall depth
106
mm
Flange thickness
9
mm
Mounting depth
97
mm
Volume occupied by the driver
0.8
L
Net weight
4.1
kg
Frame material
Diecast Aluminium
Similar woofers to VOLT BM220.8
8″Woofer
fS
33 Hz
SD
168 cm²
33 - 5000 Hz
QTS
0.25
xmax
6.0 mm
SPL1W
90 dB
Bl/√RE
3.74
Pmax
300 W
8″Woofer
fS
35 Hz
SD
168 cm²
35 - 5000 Hz
QTS
0.30
xmax
6.0 mm
SPL1W
88 dB
Bl/√RE
3.4
Pmax
300 W
8″Woofer
fS
34 Hz
SD
211 cm²
35 - 4000 Hz
QTS
0.31
xmax
5.5 mm
SPL1W
88 dB
Bl/√RE
4.11
Pmax
160 W