#1
ok, i played guitar for a long time, but still i know little bout the terms and technicality of guitar. i read and heard about 'hum cancelling'. most of it about pickup. so, what is 'hum cancelling'? heck, what do u mean with 'hum'? educate me plz... thanx in advance...
#2
Your talking about humbuckers, these are like two singlecoil pickups together, this gets rid of the hum or buzz that is produced by a singlecoil pickup.
#3
in terms of humbuckers its one magnetwith two sepparate, oppositely wound coils, that eliminates the 60 hz buzz/hum

in terms of power adapters or conditioners or what have you it just has a better grounding system to eliminate any static interference.