The Equalizer – or EQ for short – is basically a device that let’s you “sculpt” the sound by raising or lowering the volume at a specific frequency as opposed to lowering or raising the volume of the entire spectrum like a regular volume control does. When talking about EQs this is generally referred to as “boosting” or “cutting”. The number of “bands” decides on how many places the EQ can boost or cut. The width of the spectrum that the bands will affect is set with the “Q value”. There are a myriad of different EQs available that functions in different ways.