Transducer Size (Millimeters)101.6
DC Resistance5.17
Resonant Frequency91.08
Half Space Sensitivity85.87
Rated Noise Power25
Test Spectrum Bandwidth90Hz - 6kHz

Transducer Size (Millimeters) 101.6
DC Resistance 5.17 Ω±5.0%
Resonant Frequency 91.08 Hz15%
Half Space Sensitivity @ 2.83V85.87 dB±1.01
Sensitivity @ 1W/1m84.4 dB±1.01
Rated Noise Power (IEC 268-5 18.1)25 W
Test Spectrum Bandwidth 90Hz - 6kHz 12 dB/Oc
Effective Piston Area 56.8 cm2
Moving Mass 6.1 g
Motor Force Factor 4.94 T•m
Voice Coil Inner Diameter 25.73 mm
Gap Height 6 mm
Maximum Linear Excursion 3 mm
Ferrofluid Type
Minimum Impedance 5.72 Ω±7.5%
Voice Coil Inductance 0.16 mH
Mechanical Q Factor 1.92
Electrical Q Factor 0.74
Total Q Factor 0.53
Ratio 171.85 fs/Qts
Energy Bandwidth Product ((1/Qes)•fs)
Suspension Compliance 504.8 μm/N
Effective Cone Diameter 8.5 cm
Motor Efficiency Factor 4.7 (T•m2)/Ω
Voice Coil Former Material ASV
Transducer Mass 0.92 Kg
Equivalent Volume 2.28 L

This 4 inch 8 ohm driver is a member of the high performance HDS family. A powerful ferrite magnet system is coupled to a finite element analysis designed suspension system, containing both a linear spider design and a rubber surround. The motor contains an aluminium shorting ring, which reduces coil inductance, thus providing both extended frequency response performance and reduced distortion. The long-throw voice coil ensures linear high excursion performance, needed for signal clarity. The cone necks are vented so as to reduce air compression effects under high excursion conditions. The cast aluminium basket offers structural rigidity, heat sinking capacity for the motor, and additional air venting under the spider so as to again reduce air compression effects. The cone in this model is damped black polypropylene, offering a unique visual and acoustic experience.