J.Sikora eventually accomplished their aims with the use of no less than five different and carefully-tuned materials, forming a sandwich arrangement. Rotational stability is regulated by a very advanced motor control circuit (DC/PAPST) and any remaining irregularities were largely eliminated by the use of two diametrically-opposed motors. This superb turntable may be used with a wide range of tonearms. Reference Power Supply, Black only – optional (add $9,975.00) substituted for the regular power supply – AT TIME OF TURNTABLE PURCHASE ONLY $8,825.00.