DB Drive Speed SPF12D4
Subwoofer
12″ / 304 mm
Nominal diameter
23 Hz
Resonance
0.53
Q factor
86 dB
Sensitivity
1000 W
Program Power
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- Sensitivity (1W, 1m, infinite baffle)
- SPL1W
- 85.7
- dB
- Resonance frequency (free air)
- fS
- 23.2
- Hz
- Mechanical quality factor
- QMS
- 5.80
- Electrical quality factor
- QES
- 0.58
- Total quality factor
- QTS
- 0.53
- Power handling
- P
- 300
- W
- Program power
- Pmax
- 1000
- W
- Nominal impedance
- Z
- 2 x 4
- Ω
- DC resistance (in series)
- RE
- 7.2
- Ω
- Inductance (1kHz, in series, estimated)
- LE
- 2.33
- mH
- VC Diameter
- 64
- mm
- Former material
- Aluminum
- Force factor (in series)
- Bl
- 17.74
- N/A
- Motor constant
- Bl/√RE
- 6.61
- N/√W
- Material
- Ferrite
- Effective diameter
- 265
- mm
- Effective area
- SD
- 552
- cm²
- Moving mass
- MMS
- 174.4
- g
- Moving mass (without air load)
- MMD
- 165.3
- g
- Stiffness
- KMS
- 3.7
- N/mm
- Compliance
- CMS
- 270
- µm/N
- Equivalent volume to the compliance
- VAS
- 117
- L
- Mechanical resistance
- RMS
- 4.38
- N·s/m
- Surround material
- Foam
- Nominal diameter
- 12
- ″
- 304
- mm
- Overall diameter
- 315
- mm
- Baffle cutout diameter
- 284
- mm
- Mounting depth
- 89
- mm
- Volume occupied by the driver (estimated)
- 2.6
- L
- Frame material
- Steel
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