By the way, BALANCED audio uses 3 pinned connectors, sometimes refered to as Cannon or XLR connectors. UNBALANCED , mostly, RCA connectors- A single pin protruding from a shell. Signal leads from turntables use RCA connectors. But the output from the phono preamp could be either RCA or cannon, xlr connector. Bob Robert Hodge, Senior Engineer Belfer Audio Archive Syracuse University 222 Waverly Ave . Syracuse N.Y. 13244-2010 315-443- 7971 FAX-315-443-4866 >>> [log in to unmask] 4/18/2006 1:56 PM >>> We are doing some re-arranging of our studio here at the shop. We're encountering hum from the audio cables being in proximity of power cables and possibly from florescent lighting (!) Is there some way to shield audio cables from the influence of power sources? I've read that one should always cross audio and power cables rather than having them run in parallel. Any suggestions would be appreciated! Kurt & Diane Nauck c/o Nauck's Vintage Records 22004 Sherrod Ln. Spring, TX 77389 Website: www.78rpm.com E-Mail: [log in to unmask] Phone: (281) 288-7826 Fax: (425) 930-6862