Mackie 1402-VLZ Pro Owner's Manual Glossary - Page 16

SR An acronym for Sound Reinforcement, which refers to the process (or a system for) amplifying acoustic and electronic sounds from a performance or speech so that a large audience can hear clearly. Or, in popular music, so that a large audience can be excited, stunned or even partially deafened by the tremendous amplification. The term "SR" is to "PA" (Public Address) as the term "environmental cleanup technologist" is to "garbage collector". steradians Just as a radian is an angular unit of measure in 2-dimensional space, so a steradian is an angular unit of measure in 3-dimensional space (solid angle). stereo Believe it or not, stereo comes from a Greek word that means solid. We use stereo or stereophony to describe the illusion of a continuous, spacious sound field that is seemingly spread around the listener by two or more related audio signals. In practice, stereo often is taken to simply mean two channels. surround sound Multi-channel audio playback systems in four, five, or six channel formats. Surround sound is typically found in movie theaters and home theater systems. sweep EQ An equalizer that allows you to "sweep" or continuously vary the frequency of one or more sections. symmetrically balanced See balanced. T tinnitus The ringing in the ears that often results from prolonged exposure to very loud sound levels. A sound in the ears, such as buzzing, ringing, or whistling, caused by volume knob abuse! trim In audio mixers, the gain adjustment for the first amplification stage of the mixer. The trim control allows the mixer to accommodate the wide range of input signal levels that come from real-world sources. It is important to set the trim control correctly; its setting determines the overall noise performance in that channel of the mixer. See mic preamp. TRS Acronym for Tip-Ring-Sleeve, the three parts of a two-conductor (plus shield) phone plug. Since the plug or jack can carry two signals and a common ground, TRS connectors are often referred to as stereo or balanced plugs or jacks. Another common TRS application is for insert jacks, used for inserting an external processor into the signal path. TS Acronym for Tip-Sleeve, the two parts of a single conductor (plus shield) phone plug. TS connectors are sometimes called mono or unbalanced plugs or jacks. A 1/4" TS phone plug or jack is also called a standard phone plug or jack. U unbalanced An electrical circuit in which the two legs of the circuit do not have the identical impedance to ground. Often one leg is also at ground poten- 16