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43 Cards in this Set
- Front
- Back
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Name some unique benefits ear monitor systems provide
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Mobility
Safer on ears Quick set up and tear down Less bulk on truck |
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A basic wireless in ear monitor system consists of what?
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Console
Multiband peak limiter Transmitter Receiver Ear Molds |
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How does an ambient microphone fed into a musicians in ear monitor mix help the musician
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Hear Crowd Response
Localization Communication on stage |
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What does the term Loop Unity Gain refer too?
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Point where feedback occurs
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In what 4 ways is EMI transmitted or introduced into an audio system?
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Magnetic Field Coupling
Electric field Coupling Elecrtomagnetic Radiation (RFI) Common Impedence Coupling |
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What are some ways we can reduce levels of EMI
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Figure 8
cross at 90 degrees Isolation |
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Explain how a balanced differential input is able to reduce EMI
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Through common mode rejection
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What is the most common system used for technical grounding in an audio system
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Isolated star ground
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What is the solution to the pin 1 problem?
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Tie xlr input and output pin 1 to the chassis ground
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What is the max. recommended length of an unbalanced cable run?
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10 feet or shorter
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Describe 5 ways we can improve gain before feedback
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Less Mics
Mics close to source max. distance between mics and speakers place speaker close to listener speaker and mic direction |
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What does the 5% rule state
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Cable resistance should never exceed 5% of load resistance
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Name some job duties of a tour manager
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Person in charge of tour
Take care of band and entourage Enforces contract oversea travel planning and lodging pays and accounts for all expenses |
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Name some job duties of a production manager
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In charge of tour personel
Equipment transportation Set up production office Set up dressing room Enforce Rider |
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What is the difference between multimode and single mode fiber?
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Single Mode
-Allows 1 mode of light -Unlimited Bandwith Multimode -Allows multiple paths of light -lower bandwith |
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Name 4 advantages of using fiber optics over copper cables
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Low attenuation
high Bandwith Immune to EMI and RFI Difficult to tap |
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Name two methods used to splice fiber cables
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Mechanical
Fusion |
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What does the parameter "Fs" signify
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Resonant frequency of a driver
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What is Vas
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Volume of air in cubic feet having the same compliance as the drivers suspension
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Name and describe five basic enclosure types
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Dipole
Sealed Vented Combination Horn |
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Why are volume displacement values important
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Displacement affects enclosure volume
Volume affects systems resonant frequency |
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What does the parameter Xmax signify
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max. excursion in Millimeters
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Why is a transformer required at each speaker in a distro. system
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Step down voltage
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What three voltages are commonly used for constant voltage audio systems
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100v
70.7v 25v |
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What is the industry rule of thumb used when figuring required amplifier output wattage for a constant voltage system
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Total Tap + 20% = output wattage
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What are the two field componnets that make up a radio wave
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magnetic
electric |
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Name two types of mudulation
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Fequency (FM)
Amplitude (AM) |
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What two types of audio processing are used n transmitting and receiving
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Pre/Post emphasis eq
Companding |
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What does the term "true diversity" mean
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Ability to sample the radio field from two or more locations and having the ability to select or combine the resulting signal
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what is the min. antenna size for a transmitting and receiving
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1/4 the wavelength
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Name two types of antenna distribution
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Passive
Active |
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name and explain some methods used to test a driver
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9v battery
Sine wave sweep station Digital Multimeter (DMM) |
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Name 3 benefits of using ferrofluid
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Heat dissiption
coil Centering extra dampening |
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How many volts does Dbu equal
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.775v
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What 3 methods are used to detemine clip points in a system
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Peizo Magic
Onboard Indicators Oscope |
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Name the 3 common network topologies
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Ring
Star Bus (Ringo star rides the bus) |
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How many channels of digital audio can a sysrem using cobranet carry on a 100baseT network?
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64
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What is the job of a conductor in a cobranet system
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Keep time
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What point should frontfill speaker overlap
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6db down point at the first row of listeners
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why are delay fills used
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outdoors- overcome natural attenuation, high frequencies in air
Indoors- increas the direct to reverbrant sound ratio |
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Name 4 important consideration when using delay towers
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maintain same axis as mains
Many small zones is better then 1 big make them transparent to mains Pursue stereo at own risk |
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What is the difference between a directivity factor and a directivity index
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factor is beam width expressed at Q
Index is the increase in sound pressure level on axis due to confinment |
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What is a face?
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a collection of vertices that form a plane that has an acoustic property
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