Fostex P650K
Full-range
2.6″ / 65 mm
Nominal diameter
157 Hz
Resonance
0.99
Q factor
83 dB
Sensitivity
± 0.5 mm
Linear excursion
15 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
83.1
dB
Frequency response
157 - 20000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
157
Hz
Mechanical quality factor
QMS
3.39
Electrical quality factor
QES
1.40
Total quality factor
QTS
0.99
Large signal parameters
Maximum linear excursion
xmax
0.5
mm
Air volume displaced at xmax
VD
1.1
cm³
Power handling
P
5
W
Program power
Pmax
15
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
7.3
Ω
Inductance (1kHz)
LE
0.25
mH
VC Diameter
20
mm
Magnet
Force factor
Bl
3.06
N/A
Motor constant
Bl/√RE
1.13
N/√W
Weight
0.074
kg
Diaphragm
Effective diameter
52
mm
Effective area
SD
21
cm²
Moving mass
MMS
1.8
g
Moving mass (without air load)
MMD
1.7
g
Suspensions
Stiffness
KMS
1.74
N/mm
Compliance
CMS
576
µm/N
Equivalent volume to the compliance
VAS
0.35
L
Mechanical resistance
RMS
0.52
N·s/m
Dimensions
Nominal diameter
2.6
″
65
mm
Overall diameter
65
mm
Baffle cutout diameter
60
mm
Overall depth
38
mm
Net weight
0.249
kg
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SpeakerbenchSimilar speaker drivers to Fostex P650K
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2.5″Full-range
fS
160 Hz
SD
22 cm²
100 - 20000 Hz
QTS
1.10
xmax
2.0 mm
SPL1W
84 dB
Bl/√RE
1.1
Pmax
40 W
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3.3″Full-range
fS
158 Hz
SD
30 cm²
100 - 20000 Hz
QTS
0.88
xmax
0.5 mm
SPL1W
84 dB
Bl/√RE
1.38
Pmax
25 W
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2″Mid-range
fS
145 Hz
SD
16 cm²
145 - 20000 Hz
QTS
1.07
xmax
1.4 mm
SPL1W
82 dB
Bl/√RE
1.07
Pmax
20 W