People seem divided on this subject & I can't seem to find a resource online that would verify my thoughts on it... Shielding, how do you know you need it? IME, if the noise is being induced in the atmosphere (electromagnetic waves), then shielding will help, but... all possible sources of interference (within your control) should be eliminated first i.e. turning off all electrical devices in the area, including battery operated things, such as cellphones, computers, tablets turn off any UPSs that are running w/o power (on batteries) Yeah, if you're in the studio, you need some of this equipment, so maybe just jump straight to shielding if you've turned off all non-essential sources of noise already. The same would apply to gigging... Humbuckers aren't immune to noise, as many of us have learned. In this case I think the noise is a result of being induced in the wiring as well as the pickups. As far as 60 Hz hum goes, or dirty power, wouldn't that source easily be discounted if you ran your instrument battery-powered & disconnected from the suspected source?