MONACOR SPX-21M
Full-range
2″ / 56 mm
Nominal diameter
170 Hz
Resonance
0.47
Q factor
83 dB
Sensitivity
± 1.2 mm
Linear excursion
25 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
83.3
dB
Frequency response
170 - 22000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
170
Hz
Mechanical quality factor
QMS
4.66
Electrical quality factor
QES
0.53
Total quality factor
QTS
0.47
Large signal parameters
Maximum linear excursion
xmax
1.2
mm
Air volume displaced at xmax
VD
1.6
cm³
Power handling
P
12
W
Program power
Pmax
25
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
3.7
Ω
Inductance (1kHz)
LE
0.12
mH
VC Diameter
20
mm
Winding material
Kapton
Magnet
Force factor
Bl
3.32
N/A
Motor constant
Bl/√RE
1.72
N/√W
Diameter
29
mm
Weight
0.026
kg
Diaphragm
Effective diameter
41
mm
Effective area
SD
13
cm²
Moving mass
MMS
1.5
g
Moving mass (without air load)
MMD
1.4
g
Suspensions
Stiffness
KMS
1.67
N/mm
Compliance
CMS
600
µm/N
Equivalent volume to the compliance
VAS
0.14
L
Mechanical resistance
RMS
0.33
N·s/m
Dimensions
Nominal diameter
2
″
56 x 56
mm
Overall size
56 x 56
mm
Baffle cutout diameter
51
mm
Overall depth
34
mm
Flange thickness
1
mm
Mounting depth
33
mm
Net weight
0.09
kg
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SpeakerbenchSimilar speaker drivers to MONACOR SPX-21M
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2″Full-range
fS
157 Hz
SD
13 cm²
157 - 22000 Hz
QTS
0.42
xmax
0.5 mm
SPL1W
84 dB
Bl/√RE
1.71
Pmax
30 W
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2″Full-range
fS
155 Hz
SD
15 cm²
120 - 22000 Hz
QTS
0.46
xmax
2.5 mm
SPL1W
83 dB
Bl/√RE
1.94
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2″Full-range
fS
166 Hz
SD
15 cm²
160 - 20000 Hz
QTS
0.54
xmax
2.0 mm
SPL1W
82 dB
Bl/√RE
1.84
Pmax
30 W