Monitor Audio Radius 270 2 Way Tower Speaker Pair (High Gloss White Lacquer) New 4 C-CAM bass driver - Radius features all new bass drivers with concave cone profiles, introduced byour top-of-the-range Platinum speakers and applied subsequentlyto Gold GX. Extensive research and FEA modelling have allowed us to perfect the relationship between thenew radiating diaphragm and its motor design, introducing largermotor sizes and voice coils for increased excursion, higher powercapability and reduced distortion. New C-CAM gold dome tweeter - optimised to deliver the finest and widest performance within the compact Radius cabinets. It benefits from a more efficient rear-venting design, releasing air trapped and compressed at the back of the tweeter dome, and guiding it around the drive assembly to a rear-loading chamber. HiVeII port design - Straight from Platinums design blueprint, the HiVe reflex port makes its Radius debut. Its shaped to have the same effect on airflow as a gun-barrel on a bullet. Rifled grooves inside the port help to accelerate the flow and reduce turbulence, so air moves in and out of the port more efficiently, for a faster more dynamic bass response. Single through-bolt driver fixing provides mechanical de-coupling and enhanced mid-band clarity and resolution. The through-bolts also act as rigid cross bracing to give a very solid non-resonant cabinet. Front and rear ported reflex design