This driver features a low-mass, surface-treated aluminium/magnesium alloy cone which behaves like a piston throughout the audible frequency range, without any sign of midrange resonances. The coaxially mounted aluminium/magnesium alloy dome tweeter has a low resonance frequency, and integrates with the cone driver to form a point source. The cone profile has been carefully designed to optimally load the tweeterﾒs radiation. A completely new rubber surround reduces resonances and prevents surround break up in the midrange band. The surroundﾒs small inverted roll, combined with a profile that follows the shape of the cone, results in almost total elimination of diffraction effects on the tweeterﾒs output. The powerful neodymium magnet system, with its small profile and optimal shape, results in high midrange sensitivity with minimal back wave reflections. Heavy copper rings mounted above and below the T-shaped pole piece reduce nonlinear and modulation distortion and increase overload margin. The crown-shaped copper tweeter support ring eliminates any resonance coming from the cavity between the tweeter body and midrange voice coil former. All of these features work together to provide a smooth and well behaved off-axis response throughout the entire operating range.