the sound system design primer

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microsoft word - loar_sound system design primer_quiz questions and exercises.docx the sound system design primer—by josh loar quiz questions and class exercises (grouped by chapter) note: the following material will be presented by chapter, and each chapter will feature quiz questions on the material contained therein. questions will be in one of three basic types: 1) multiple-choice, 2) simple answer/fill in the blank, 3) equations or complex answer. it should be evident from reading each question which type it is. some, but not all, chapters will also feature suggested classroom exercises/projects for teachers. each chapter will be formatted as such: chapter x: questions: exercises: if there are no exercises for a given chapter, it will simply read “exercises: n/a” chapter 1: questions: 1) which of the following is not a standard element of an analog sound system? a. inputs b. outputs c. clocking d. processing 2) a microphone can be …

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xible routing d. less hardware needed for effects 4) clocking, in a digital audio system, performs which function listed below? a. aligns sample rates of different digital audio devices b. rectifies ac current to dc current c. measures amplitude of incoming digital audio signals for assignment to digital bits d. ensures all devices show the same time/date exercises: 1) connect two digital audio devices, such as a computer with hardware interface and a mixing console. connect the mixing console to speakers (amplifiers as well, if the speakers are passive). set the internal clock of the computer and the console at different sample rates. play digital audio over digital connections and listen to the problems (“jitter”), then set the clocks to the same sample rate, and listen to the improvement. 2) if such gear is available, connect a system as above with playback computer, console, and speakers. play audio. then, connect …

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a. the loudness range b. effective loudness c. dynamic range d. loudness threshold 8) we have a speaker producing 110 db spl, measured at 1 meter, powered at full continuous power. how loud will that speaker be when powered at full, measured at 7.5 meters? 9) we have a speaker producing 121 db spl at 1 meter, full power. how loud will that speaker be, at full power, measured at 3.7 meters? 10) what is the wavelength of 2000hz? 11) what is the wavelength of 20hz? 12) in order for a sound to truly reflect off of a surface, not to diffuse, how large must the surface be compared to the wavelength of the sound? a. 1x or greater b. 3x or greater c. 4x or greater d. 7x or greater 13) if sound hits a surface at 30°, but bounces off at 45°, it is said to have: a. …

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ow). use the inverse square law to calculate projected spl difference of a signal from the front measurement to the back. then, play a test signal like pink noise through a speaker aimed at the seating area of the room. use an spl meter to measure the difference and see how closely it tracks to the projected calculations. if the numbers are similar, great! if they are very different, make sure the spl meter is properly calibrated, recheck your math, and then explore what about the room might be changing the anticipated levels to the measured (e.g. is there a resonant cavity, like a big empty cabinet, in the space that is adding level? are there cancellations from reflections taking place? is the speaker highly directional, so fall-off is a bit less than expected? etc.) 2) using a sine wave generator, played through a full-range, flat-response speaker system (20hz-20khz), play …

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ds around objects. 4) measure spl for a balloon popping at various distances and positions, versus measuring spl for a very directional speaker playing an hf signal in one direction (to show the difference between on-axis and off-axis hf coverage, versus a truly omnidirectional source). chapter 4: questions: 1) charge in an electrical circuit flows from: a. positive to negative b. negative to positive c. whichever way you tell it to flow 2) the standard unit for measuring potential energy is: a. wattage b. amperage c. voltage d. resistance 3) which of the below values are denominated in ohms (select all that apply)? a. electromotive force b. resistance c. current d. impedance 4) if you have a 115v wall socket, and connect to it an incandescent lightbulb (with no dimmer) that has a fixed resistance of 44 ohms, how much current will that lightbulb draw? 5) if you have a …

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microsoft word - loar_sound system design primer_quiz questions and exercises.docx the sound system design primer—by josh loar quiz questions and class exercises (grouped by chapter) note: the following material will be presented by chapter, and each chapter will feature quiz questions on the material contained therein. questions will be in one of three basic types: 1) multiple-choice, 2) simple answer/fill in the blank, 3) equations or complex answer. it should be evident from reading each question which type it is. some, but not all, chapters will also feature suggested classroom exercises/projects for teachers. each chapter will be formatted as such: chapter x: questions: exercises: if there are no exercises for a given chapter, it will simply read “exercises: n/a” chapter …

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