KEF R8a – The R8a is a flexible solution for anybody wanting to bring an all-immersive movie experience to their home. The R8a can be placed on top of another speaker or be used as a surround speaker mounted to the wall. Equipped with a 130mm (5.25 in.) Uni-Q array with a 25mm (1 in.) tweeter, KEF says every detail is described and steered around the listening space as the director intended.