The co-axial drive unit (a tweeter integrated into the mid/woofer) ensures the same acoustic centre for the two drivers and thus the treble and bass frequencies reach your ears in correct acoustic phase (simultaneously) regardless of whether or not your listening position is off-axis – horizontally or vertically.
 

Normally when placing a loudspeaker close to a TV, the magnets of the drive units will cause discolouration of the TV picture. Therefore centre channel speakers – which in order to achieve best possible coherence between picture and sound, need to be placed as close to the TV as possible –must feature shielded magnets to eliminate the disturbing magnetic radiation.

Neodymium is a powerful magnetic material – 10 times more powerful than a normal magnet. Because the magnet can be reduced in size, it can typically be placed inside the voice coil of the loudspeaker unit, allowing the magnetic force to be converted around the voice coil – exactly where it is needed.