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
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
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
Fostex P650K SPL & Impedance
Fostex P650K Dimensions

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Similar speaker drivers to Fostex P650K

Peerless TC7FD00-04 Full-range
2.5Full-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