Yes, naive ways cause big problems. While I've seen people do many ill-advised things in home and studio audio, professional concert audio is decidedly more but

Yes, naive ways cause big problems. While I've seen people do many ill-advised things in home and studio audio, professional concert audio is decidedly more buttoned down: Grounding is not isolated, but NEC-compliant star grounded (See NEC 400.8, 520, 525, 530 (movies), and 640 (carnivals) ) Loop area is actively minimized Signal transmission is via instrumentation amplifier topology (i.e. differential) Shielding is designed to minimize shield current induced noise (SCIN) These Rane tech notes gives a good overview on some of the topics above: http://www.rane.com/note165.html http://www.rane.com/note165.html http://www.rane.com/note166.html http://www.rane.com/note166.html The AES standard for audio interconnects is here: http://www.aes.org/publications/standards/search.cfm?docID=44 http://www.aes.org/publications/standards/search.cfm?docID=4...