Brooks Cinema XR 607 Compact Disc CD

A small optical disk with digital audio recorded on it.

FOH (Front of House)
Refers to the speakers that face toward the audience. Also called the "main" speakers.

Brooks Cinema TZ 505 Equal Loudness Contours
A drawing of several curves showing how loud the tones of different frequencies would have to be played for a person to say they were of equal loudness.

Isolation Booth/ Isolation Room
A room that prevents loud sounds from other instruments from leaking in: an isolation booth is usually a smaller room that could be used for only one musician.

Brooks Cinema RM 909 Clean
Describes a distortion free sound with few effects.

High-Pass Filter
A device that rejects signals that are below a certain frequency (called the cut-off frequency) and passes signals with frequencies that are higher.

Atom
The smallest particle which makes up a specific substance. It's composed of a center around which electrons revolve.

Horn
1) The part of the speaker that emits midrange and higher range frequencies.
2) A speaker or speaker enclosure where sound waves are put into a narrow opening (by a speaker cone or driver) and the narrow opening flairs out to a larger opening.