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...
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.
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.