AET 2560 - Sound Reinforcement Final Exam questions and answers well illustrated.

AET 2560 - Sound Reinforcement Final Exam questions and answers well illustrated. illegal frequency bands - correct answers.100 - 799 mHz squelch - correct answers.a circuit for preventing a radio receiver from producing audio-frequency output in the absence of a signal having predetermined characteristics diversity receiving - correct antennas switching systems to pick up strongest signal from antenna difference between limiting and compressing - correct essor: a signal processor that for a given input amplitude range produces a smaller output range limiter: a signal processor in which some characteristic of the output is automatically prevented from exceeding a predetermined value side-chain input on a compressor - correct to the gain reduction stage of circuit allows external audio source to control gain reduction gate - correct uates signals that register below the threshold; the gate opens when signals pass the threshold downward expander - correct the signal level drops below the threshold, the signal gain is decreased notch filter - correct answers.a band-stop filter with a narrow stop band (high Q factor) advantage of using stereo input channel over a reverb return - correct answers.... parametric EQ - correct des both sweepable center frequencies and adjustable Q, as well as boost / cut controls semi-parametric EQ - correct des control of the amplitude and frequency, but uses a pre-set bandwidth of the center frequency non-parametric EQ - correct answers.... graphic EQ - correct -frequency, band reject filter, or a band-pass / reject filter LPF - correct -pass filter; passes low-frequency signals and attenuates signals with frequencies higher than the cutoff frequency BPF - correct -pass filter; passes frequencies within a certain range and attenuates frequencies outside that range HPF - correct -pass filter; passes high-frequency signals but attenuates signals with frequencies lower than the cutoff frequency threshold - correct in dB point at which a compressor reduces the level of an audio signal if its amplitude exceeds that point ratio - correct t of gain reduction 4:1 means that if input level is 4 dB over the threshold, the output signal level will be 1 dB over the threshold; the gain (level) has been reduced by 3 dB attack - correct d when the compressor is decreasing gain to reach the level that is determined by the ratio release - correct d when the compressor is increasing gain to the level determined by the ratio, or, to zero dB, once the level has fallen below the threshold make-up gain - correct gain for after a signal undergoes the gain reduction process of compression personal PA - correct answers.... fixed installation - correct nent, consistent, ready inflexible, costly distributed system - correct ple sections of speakers, point source headroom - correct amount by which the signal-handling capabilities of an audio system exceed a designated level distortion - correct kind of deformation of an output waveform compared to its input usually clipping, harmonic distortion, or intermodulation distortion (mixing phenomena) caused by non-linear behavior of electronic components and power supply limitations crest factor - correct re of a waveform, such as alternating current or sound, showing the ratio of peak values to the average value gain before feedback - correct answers.a measure of how much a microphone can be amplified in a sound reinforcement system before causing audio feedback NL2, NL4, NL8 - correct on connectors NL2: 1+, 1- NL4: 1+, 1-, 2+, 2- NL8: 1+, 1-, 2+, 2-, 3+, 3-, 4+, 4- balanced cable - correct ins two identical wires, which are twisted together and then wrapped with a third conductor (foil or braid) that acts as a shield drive rack - correct ic EQ, crossover, amplifiers, etc. advantages / disadvantages of active and passive crossovers - correct e: flexible, adjustable filters / amplification; filtering occurs before amplification and needs an external power source passive: power source is in same system; predetermined crossover slope and points 2-way, 3-way, 4-way system - correct answers.2-way: consists of a low-pass and a high-pass filter 3-way: constructed as a combination of low-pass, band-pass and high-pass filters (LPF, BPF and HPF respectively) 4-way: constructed as a combination of low-pass, band-pass and high-pass filters (LPF, BPF and HPF respectively) how do you set up auxiliary driven subs, what is the advantage it gives - correct answers.... how do you calculate a speaker's delay setting, what is the rule of thumb - correct answers.[NOT ON TEST] what is the purpose of limiting the drive line - correct answers.... amp class A - correct s to an output stage with bias current greater than the maximum output current, so that all output transistors are always conducting current biggest advantage is that it is most linear, ie: has the lowest distortion amp class B - correct output stages which have zero idle bias current have a significant advantage over Class A in efficiency because they use almost no electricity with small signals