Mackie SR244 / SR324 Owner's Manual - Page 49
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ated by bouncing electrons in the transistor junctions. The lower the noise floor and the higher the headroom, the more usable dynamic range a system has. pan, pan pot Short for panoramic potentiometer. A pan pot is used to position (or even move back and forth) a monaural sound source in a stereo mixing field by adjusting the source's volume between the left and right channels. Our brains sense stereo position by hearing this difference in loudness when the sound strikes each ear, and also take into account time delay, spectrum, ambient reverberation and other cues. parametric EQ A "fully" parametric EQ is an extremely powerful equalizer which allows smooth, continuous control of each of the three primary EQ parameters (frequency, gain, and bandwidth) in each section independently. "Semi" parametric EQs allow control of fewer parameters, usually frequency and gain, i.e., they have a fixed bandwidth, but variable center frequency and gain. peaking Is the opposite of dipping, of course. A peak is an EQ curve which looks like a hill, or a peak. Peaking with an equalizer amplifies a band of frequencies. PFL An acronym for Pre Fade Listen, or PRE FADER on the SR24•4. Broadcasters would call it cueing. Sound folks call it being able to solo a channel with the fader down. phantom power A system of providing electrical power for condenser microphones (and some electronic pickup devices) from the sound mixer. The system is called phantom because the power is carried on standard microphone audio wiring in a way which is "invisible" to ordinary dynamic microphones. Mackie mixers use standard +48 volt DC power, switchable on or off. Most quality condenser microphones are designed to use +48 VDC phantom power. Check with the manufacturer's recommendations. Generally, phantom power is safe to use with non-condenser microphones as well, especially dynamic microphones. However, unbalanced microphones and equipment, some electronic equipment (such as some wireless microphone receivers) and some ribbon microphones can short out the phantom power and can be severely damaged. Check the manufacturer's recommendations and be careful! phasing A delay effect, where the original signal is mixed with a short (0 to 10 msec) delay. The time of the delay is slowly varied, and the combination of the two signals results in a dramatic moving comb-filter effect. Phasing is sometimes imitated by sweeping a combfilter EQ across a signal. A comb filter can be found in your back pocket. phone jack Ever see those old telephone switchboards with hundreds of jacks and patch cords and plugs? Those are phone jacks and plugs, now used widely with musical instruments and in audio equipment. A phone jack is the female connector, and we use them in 1/4" twoconductor (TS) and three-conductor (TRS) versions. phone plug The male counterpart to the phone jack, right above. phono jack See RCA phono jack. phono plug See RCA phono plug. post-fader A term used to describe an aux send (usually) that is connected so that it is affected by the setting of the associated channel fader. Sends connected this way are typically (but not always) used for effects. See pre-fader. pot, potentiometer In electronics, a variable resistor, which varies the potential, or voltage. In audio, any rotary or slide control. pre-fader A term used to describe an aux send (usually) that is connected so that it is not affected by the setting of the associated channel fader. Sends connected this way are typically (but not always) used for monitors (foldback). See post-fader. proximity effect The property of many directional microphones to accentuate their bass response when the source-to-mic distance is small, typically three inches or less. Singers generally like this effect, even more than singing in the shower. Appendices 47