Mackie 1642-VLZ Pro Owner's Manual Glossary - Page 9
guacamole, Haas precedence effect, headroom, Hertz, house, impedance, input module, insert
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system. Never disable the safety ground in an attempt to solve hum problems. guacamole Just kidding (see dipping). Hz Short for Hertz. I H Haas precedence effect A psychoacoustic effect in which the time of arrival of a sound to the left and right ears affects our perception of direction. If a signal is presented to both ears at the same time and at the same volume, it appears to be directly in front of us. But if the signal to one ear, still at the same volume, is delayed slightly, the sound appears to be coming from the earlier (nondelayed) side. headroom The difference between nominal operating level and peak clipping in an audio system. A mixer with a nominal operating level of +4 dBu and a maximum output level of +22 dBu has 18 dB of headroom. Plenty of room for surprise peaks. Hertz The unit of frequency, equal to 1 cycle per second. Abbreviated Hz. kHz 1000 Hz, and is usually pronounced "kay"(with "Hertz" implied) by sound professions who ask for "a little more two and a half K" when they want you to boost 2.5 kHz. house In Sound Reinforcement parlance, "house" refers to the systems (and even persons) responsible for the primary sound reinforcement in a given hall, building, arena or "house." Hence we have the house mixer or house engineer, the house mix, the house mix amps, the main house speakers and so on. impedance The A.C. resistance, capacitance, and inductance in an electrical circuit, measured in ohms. In audio circuits (and other ac circuits) the impedance in ohms can often be much different from the circuit resistance as measured by a dc ohmmeter. Maintaining proper circuit impedance relationships is important to avoid distortion and minimize added noise. Mackie input and output impedances are set to work well with the vast majority of audio equipment. input module A holdover from the days when the only way that real consoles were built was in modular fashion, one channel per module. See channel strip. insert Noun - a place where a signal path can be broken and a processing device placed in line with the signal. It's usually a TRS jack with one conductor being an output (send) and the other being an input (return). The jack is wired with a normalled connection so that with nothing plugged in, the send and return are connected together, as if it wasn't even there. In Mackie mixers, the insert jacks are wired with tip as send, ring as return, and sleeve as ground. Verb - we don't want to go there. J 9