Reckhorn D-250

Subwoofer

10″ / 250 mm
Nominal diameter
22 Hz
Resonance
0.33
Q factor
86 dB
Sensitivity
± 13 mm
Linear excursion
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
86.1
dB

Thiele & Small parameters

Resonance frequency (free air)
fS
22.0
Hz
Mechanical quality factor
QMS
4.26
Electrical quality factor
QES
0.36
Total quality factor
QTS
0.33

Large signal parameters

Maximum linear excursion
xmax
13.0
mm
Air volume displaced at xmax
VD
429
cm³

Voice Coil

Nominal impedance
Z
4
Ω
DC resistance
RE
3.8
Ω
Inductance (1kHz)
LE
2.32
mH

Magnet

Force factor
Bl
11.38
N/A
Motor constant
Bl/√RE
5.83
N/√W

Diaphragm

Effective diameter
205
mm
Effective area
SD
330
cm²
Moving mass
MMS
88
g
Moving mass (without air load)
MMD
83.6
g

Suspensions

Stiffness
KMS
1.67
N/mm
Compliance
CMS
600
µm/N
Equivalent volume to the compliance
VAS
91
L
Mechanical resistance
RMS
2.85
N·s/m

Dimensions

Nominal diameter
10
250
mm
Overall diameter
260
mm
Baffle cutout diameter
230
mm
Overall depth
145
mm
Flange thickness
8
mm
Mounting depth
137
mm
Volume occupied by the driver (estimated)
2.1
L
Net weight
5.1
kg
Reckhorn D-250 SPL

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