Jack plug - or socket - Is a socket and plug combination used in CONSUMER audio goods and equipment (for example iPods and PSP headphone sockets)

It is usually (and sometimes also called) 3.5mm (millimetre) or 2.5mm - depending on the diameter of the barrel of the plug used. (3.5 is much more common)

The connector is not considered professional and is replaced by the XLR connector in professional camera and audio equipment.

wind Gag - A Wind gag is a usually soft fur covered sheath that slides over microphones of all sizes to prevent the rushing sound caused by wind passing over sensitive mics

microphone - (often abbreviated to mic) Is an electrical device that converts sound vibrations into electrical signals that can then be recorded or amplified.

Types of microphones vary widely from vocal mics, to lapel (clothing attached) microphones to direction / shotgun mics for recording sound from a particular direction on a TV or film set.

Microphones vary greatly in sensitivity and choosing the wrong microphone for a particular job can result in recordings that are either too quiet, inaudible or badly distorted.

Microphones generate what is known as "MIC LEVEL" signals (which are electrical signals generally 100 times quieter than LINE LEVEL signals - which come from cameras, CD players and iPods)

mic - See Microphone

a term used to describe the mounting of certain types of audio visual equipment - especially in outside broadcast vehicles and recording studios.

Rack mounted equipment always conforms to a standard width of 19 inches (approximately 40 cms) hence the term 19| rack mount. The height of a standard piece of 19" rack equipment is known as 1U or one unit. This can be as high as 2m3 or 4 units depending on the equipments role. ("Half U" means rack equipment that is able to it in pairs along side each other in 1 rack unit or "U"

Rack mixers are mixers designed to mount into 19" rack mounting cabinets.