Transducer Size (Millimeters)133.35
DC Resistance3.18
Resonant Frequency75.53
Half Space Sensitivity91.55
Rated Noise Power30
Test Spectrum Bandwidth60Hz-10KHz

Transducer Size (Millimeters) 133.35
DC Resistance 3.18 Ω±5.0%
Resonant Frequency 75.53 Hz15%
Half Space Sensitivity @ 2.83V91.55 dB±1.01
Sensitivity @ 1W/1m88.8 dB±1.01
Rated Noise Power (IEC 268-5 18.1)30 W
Test Spectrum Bandwidth 60Hz-10KHz 12 dB/Oc
Effective Piston Area 89.9 cm2
Moving Mass 9.1 g
Motor Force Factor 5.56 T•m
Voice Coil Inner Diameter 25.73 mm
Gap Height 6 mm
Maximum Linear Excursion 1.9 mm
Ferrofluid Type
Minimum Impedance 4.26 Ω±7.5%
Voice Coil Inductance 0.06 mH
Mechanical Q Factor 1.74
Electrical Q Factor 0.44
Total Q Factor 0.35
Ratio 213.36 fs/Qts
Energy Bandwidth Product ((1/Qes)•fs)
Suspension Compliance 488.5 μm/N
Effective Cone Diameter 0 cm
Motor Efficiency Factor 9.7 (T•m2)/Ω
Voice Coil Former Material ASV
Transducer Mass 1.64 Kg
Equivalent Volume 5.55 L

This 4 ohm 5.25 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.