The HD120 has been designed for 2-way or 3-way systems. It delivers an unmatched combination of extended linear frequency response and very high efficiency. With a 1-inch exit throat, the HD120 has been developed to match the XT120 and XT1086 constant directivity horns.
The design of diaphragm and its surround in polyester material allows optimum movement and stress control; the special radial ribs increase stiffness avoiding uncontrolled vibration modes in the usable frequency range.
An edge-wound aluminum voice coil, wound on proprietary treated Nomex, completes diaphragm assembly. Thanks to its physical properties, the proprietary treated Nomex former shows a 30% higher value of tensile elongation at a working operative temperature (200°C) when compared to Kapton. This feature enables proper energy transfer control from the voice coil to the dome in real working conditions. Moreover, this proprietary former material is also suitable for use in higher moisture content environments.
The polypropylene phase plug is the result of a meticulous design project. Its shape assures the correct acoustic impedance of the radiating dome, reducing distortion levels across a very wide frequency range. The result is a smooth coherent wave front at the horn entrance, high thermal stability and manufacturing consistency.
The HD120’s compact size and lightweight ceramic magnet assembly has been designed to obtain 16KGauss in the gap.

Throat Diameter 25,4 mm (1 in)
Rated Impedance 8 ohm
DC Resistance 5,7 Ohm
Minimum Impedance 6,6 ohms at 6500 Hz
AES Power (1) 25 W above 2,5 kHz
Continuous Program (2) 50 W above 2,5 kHz
Sensitivity(1W@1m) (3) 108 dB
Frequency Range 2 kHz ÷ 18 kHz
Recomm. Xover Frequency 3000 Hz (12dB/oct slope)
Diaphragm Material Polyester
Voice Coil Diameter 25,4 mm (1 in)
Voice Coil Winding Material Edge-wound aluminum
Magnet Material Ferrite
Flux Density 1,65 T
BL Factor 3,5 N/A
Polarity Positive voltage on red terminal gives positive pressure in the throat