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==== Hum ====
Hum, (also known as ground hum), is a constant sound at a fixed frequency, typically 50, 60, or 120 HZ. Its low-frequency, low-overtone nature sounds similar to the vocal technique of humming. It is usually caused by a [[#Ground Loop|ground loop]] but may simply be an artifact of the amplifier's design, requiring transforming AC from its power mains.
==== Ice Pick ====
This refers to a tone that is so extremely bright, it hurts to listen to. It is said to be like driving an ice pick into your ears. It can be due to high amounts of high frequencies that are normally very low volume compared to other frequencies in guitars - such as anything over 5-8 kHZ. But it can also be due to a peak frequency lower than this (such as 3kHZ) that is simply extremely loud.
==== Impedance ====