An enclosure for speakers. Sometimes shortened to 'cab'. Many stage guitar rigs include seperate amps and cabinets. Cabinets are usually described based on the sizes of speakers inside - for example 4x12 means four twelve inch speakers, or 2x6 + 16 means two six inch speakers and a sixteen inch speaker. Some cabinets serve special purposes, like "sub cabs" which are subwoofer enclosures for creating sub-audible range sounds, or leslie cabs, which are specially designed to create an effect called leslie.