Transducer Size (Millimeters)165.1
DC Resistance3.43
Resonant Frequency39
Half Space Sensitivity90.52
Rated Noise Power50
Test Spectrum Bandwidth20Hz-20KHz

Transducer Size (Millimeters) 165.1
DC Resistance 3.43 Ω±5.0%
Resonant Frequency 39 Hz15%
Half Space Sensitivity @ 2.83V90.52 dB±1.01
Sensitivity @ 1W/1m88.1 dB±1.01
Rated Noise Power (IEC 268-5 18.1)50 W
Test Spectrum Bandwidth 20Hz-20KHz 12 dB/Oc
Effective Piston Area 143.1 cm2
Moving Mass 18 g
Motor Force Factor 6.33 T•m
Voice Coil Inner Diameter 32.41 mm
Gap Height 6 mm
Maximum Linear Excursion 5.1 mm
Ferrofluid Type
Minimum Impedance 4.63 Ω±7.5%
Voice Coil Inductance 0.19 mH
Mechanical Q Factor 2.2
Electrical Q Factor 0.38
Total Q Factor 0.32
Ratio 121.11 fs/Qts
Energy Bandwidth Product ((1/Qes)•fs)
Suspension Compliance 924.4 μm/N
Effective Cone Diameter 13.5 cm
Motor Efficiency Factor 11.7 (T•m2)/Ω
Voice Coil Former Material ASV
Transducer Mass 1.58 Kg
Equivalent Volume 26.6 L

This 4 ohm 6.5 inch 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 a paper cone, offering a unique visual and acoustic experience.