Transducer Size (Millimeters)165.1
DC Resistance6.5
Resonant Frequency58
Half Space Sensitivity88.44
Rated Noise Power75
Test Spectrum Bandwidth50Hz - 4kHz

Transducer Size (Millimeters)165.1
DC Resistance6.5 Ω±5.0%
Resonant Frequency58 Hz15%
Half Space Sensitivity @ 2.83V88.44 dB±1.01
Sensitivity @ 1W/1m88 dB±1.01
Rated Noise Power (IEC 268-5 18.1)75 W
Test Spectrum Bandwidth50Hz - 4kHz 12 dB/Oc
Effective Piston Area143.1 cm2
Moving Mass17.3 g
Motor Force Factor8.82 T•m
Voice Coil Inner Diameter32.41 mm
Gap Height6 mm
Maximum Linear Excursion5.3 mm
Ferrofluid Type
Minimum Impedance7.32 Ω±7.5%
Voice Coil Inductance0.42 mH
Mechanical Q Factor2.29
Electrical Q Factor0.53
Total Q Factor0.43
Ratio135.2 fs/Qts
Energy Bandwidth Product ((1/Qes)•fs)
Suspension Compliance434.3 μm/N
Effective Cone Diameter13.5 cm
Motor Efficiency Factor12 (T•m2)/Ω
Voice Coil Former MaterialASV
Transducer Mass1.58 Kg
Equivalent Volume12.5 L

This 6.5 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.