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BAD LAUGHAn audience's laugh at the wrong moment. 
BAFFLE1) A sheet of material used to prevent a spill of light in a instrument or in part of a set. 2) A panel in a loudspeaker cabinet designed to reduce back interference noise by isolating the front and rear of the loudspeaker diaphragm. 3) A panel in an auditorium positioned so as to reduce sound reflections and improve the acoustics of the space. 
BAFFLE1) A sheet of metal or other material used in a lighting unit, or in a setting, to limit light spill. 2) A board or sheet of other material used in sound equipment to limit echo or sound spill. 
BALANCEThe equalization of the stage picture, composition, and action, so that the position and movements of the actors, the design of the set, lighting and costumes all are in a well-proportioned relationship. 
BALCONYA seating area above the orchestra section of the auditorium. Sometimes a part of this area, particularly in front, is the location for equipment, hence the term "balcony lighting." 
BALCONY FRONTThe vertical front face of a balcony to which is fastened lighting equipment.Balcony
BALCONY STAGEIn Elizabethan theatre, an area of the balcony used for a playing area. 
BALLADA song, usually, simple, sentimental, short, and narrative, used in musical comedy. 
BALLAD OPERAA light satirical comedy, consisting of dialogue in verse or prose, plus songs set to popular and folk tunes. 18th and early 19th centuries. "The Beggar's Opera" is the best-known example. 
BALLASTAn electrical apparatus that limits the electrical current in a particular circuit, usually a circuit containing an arc source. An "arc" is light caused by an electrical discharge between two electrodes in a gas such as xenon, argon, or air.  
BALLYHOOMoving a followspot beam around in a figure-eight pattern. 
BANKA group of lighting units or dimmers arranged in rows. 
BARN DOORSAn apparatus with adjustable flaps, usually 2, 4 or 8, that attaches to the front of a lighting instrument. It is used to block or shape the beam--for example, to keep light from hitting the front or side edge of the stage.Shutter
BASIC SITUATIONThe central dramatic situation in a play. 
BASSLower end of the musical scale. In acoustics, the range (below about 200Hz) in which there are difficulties, principally in the reproduction of sound, due to the large wavelengths involved. 
BATTENA narrow strip of wood used to make or reinforce the frame of a flat, to fasten flats together, to stiffen a drop, to suspend a hanging piece of scenery or equipment. A length of metal pipe is sometimes used for the latter purpose, called a batten or pipe batten. 
BEAMLight rays, particularly the width of light projected by a lighting instrument. 
BEAM ANGLEThe angle of the cone of light produced by a instrument. Defined as the angle within which the lowest intensity in a beam of light from a instrument is not less than one-tenth of the maximum. 
BEA< PROJECTORFlood instrument which uses a parabolic reflector and a low voltage high intensity lamp to produce an intense near-parallel beam. Also known as a Beamlight. 

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