Transducer Size (Millimeters)254
DC Resistance4.39
Resonant Frequency33.5
Half Space Sensitivity88.75
Rated Noise Power300
Test Spectrum Bandwidth20-20kHz

Transducer Size (Millimeters) 254
DC Resistance 4.39 Ω±5.0%
Resonant Frequency 33.5 Hz15%
Half Space Sensitivity @ 2.83V88.75 dB±1.01
Sensitivity @ 1W/1m86.6 dB±1.01
Rated Noise Power (IEC 268-5 18.1)300 W
Test Spectrum Bandwidth 20-20kHz 12 dB/Oc
Effective Piston Area 353.3 cm2
Moving Mass 103.5 g
Motor Force Factor 14.2 T•m
Voice Coil Inner Diameter 75.55 mm
Gap Height 8 mm
Maximum Linear Excursion 12.6 mm
Ferrofluid Type
Minimum Impedance 4.92 Ω±7.5%
Voice Coil Inductance 1.02 mH
Mechanical Q Factor 11.7
Electrical Q Factor 0.48
Total Q Factor 0.46
Ratio 73.46 fs/Qts
Energy Bandwidth Product ((1/Qes)•fs)
Suspension Compliance 218 μm/N
Effective Cone Diameter 21.21 cm
Motor Efficiency Factor 45.9 (T•m2)/Ω
Voice Coil Former Material TIL
Transducer Mass 7.23 Kg
Equivalent Volume 38.47 L

This 10inch 6ohm member of the SDF product family has all the design features suitable for a high performance, high excursion subwoofer. The motor features a strong ferrite magnet with bump T yoke, supporting high excursion, and aluminium shorting rings and pole extenders, lowering and linearizing the inductance of the overhung voice coil. The paper cone is vented under the dust cap, to reduce air compression. The suspension system features a low-creep rubber surround, and a optimized spider, ensuring long-term reliability under high power conditions. The product also features a upgraded die cast basket.