Clearlight Audio RDC 1 Isolation Cones (Set of 4). Large cone measuring 40mm in diameter and 37mm tall, load capacity 25kg per cone. Available Unthreaded or with M6 and M8 threaded inserts The Clearlight Audio RDC 1 is ideally suited for the replacement of spikes on floor-standing loudspeakers and are available unthreaded or with a choice of 6mm or 8mm threaded inserts On solid floors the RDC 1 cone helps to isolate the loudspeaker cabinet from its environment, giving a clearer, more natural tone to vocals and a tighter control of bass. Even on carpeted floors the nature of the RDC material reduces the effects of c