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→Frequency Response
==== Frequency Response ====
Any signal can be broken down into an infinite number of amplitude levels for an infinite number of frequencies. Many devices will tend not to equally affect all frequencies - this affect on the signal can be called its frequency response. Speakers often have unique responses, and will often display a frequency response graph - a visual representation of how it affects frequencies input into it. All devices have their own responses, but many (most obviously amplifiers) include EQ controls to vary this.
==== Graphic EQ ====
A graphic EQ consists of a (usually large, eg. >= 5) number of band-pass/band-stop filters at approximately-equidistant, fixed frequencies such that they can affect the entire frequency spectrum. Their gain levels are usually controlled by vertical sliders to approximate the visual appearance of the filters' effect on the spectrum (hence the name "Graphic EQ").
==== Half Note ====