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ASP
Final study cards
47
Other
Undergraduate 1
05/03/2007

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Cards

Term
Name some unique benefits ear monitor systems provide
Definition
low stage volume
mobility
Clean stage
Less setup time
safer on your ears
Term
How does an ambient mic fed into a musicians in ear monitor mix help the musician
Definition
It helps the musicians hear crowd response and helps with localization when using isolation
and allows communication on stage
Term
What is the signal flow for a Wireless IEM signal flow in order
Definition
Console> IEM processor >IEM Transmitter >IEM reciever> Ear Buds
Term
What does the term loop unity gain refer to
Definition
The point in a system in wich feedback occurs
Term
Acoustic gain formula
Definition
NAG=20LOG(Dl )
____
EAD
Term
Describe 5 ways we can improve gain before feed back
Definition
Use as few mics as practical
Mic as close to the scource as practical
Take advantage of speaker and mic directionality
Place the speakers as close to the listener as practical
Maximize distance between mics and speakers
PAG>Nag
-
Term
In what 4 ways is emi transmitted or introduced into an audio system
Definition
common impedence coupling
electric field coupling
Magnetic field Coupling (humm)
Electromagnetic Radiation RFI
Term
What are some ways we can reduce levels of EMI
Definition
Shields
Seperation
Twisting /figure 8/Cross at 90
Fix pin 1 problem
Balanced interconnection
Term
Explain how a balanced differential input is able to reduce EMI
Definition
Through Common Mode Rejection
Term
What is the most commonsystem used for technical grounding
Definition
Star Ground
Term
What is the solution to the pin one problem
Definition
Tie the XLR input and output pin 1 directly to chassis ground
Term
What is the maximum recomended length of an unbalanced cable run
Definition
10ft
Term
What are the 3 primary factors determining power loss in speaker cable runs
Definition
length
load
gauge
Term
What does the 5% rule state
Definition
cable resistance should never exceed 5% of load Resistance
Term
Damping factor Formula
Definition
dc voice coil resistance
DF=___________________________
Amplifier output z+ Cable Resistance
Term
What is the difference between multimode and single mode
Definition
One pathway for single and 2 paths for Multi

short lower bandwith
Longer higher bandwith
Term
Name 4 advantages of using fiber optics over copper cables
Definition
Higher bandwith
Low attenuation
Immune to EMI
Light weight
and also high security
Term
Name two methods used to splice fiber optic cables
Definition
Fusion
and
Mechanical
Term
What does the parameter Fs Signify
Definition
Resonant frequency of the driver determined by finding the peak impedance Dependent on the size and mass
Term
What is V as
Definition
Amt of air in cubic feet having the same compliance as the drivers suspension
Term
Name and descrive five basic enclosure types
Definition
Dipole
sealed
vented
combination
and horn
Term
Why are volume displacement values important
Definition
Displacement affects enclosure volume
and volume affects systems resonant frequency
Term
What does the parameter X max signify
Definition
Maximum excursion in millimeter (damage)
Vb=Box volume
Fsc = Resonant Frequency of the system (sealed Sytem)
Golden Ratio =(1:.618: 1.618)
dimensions
Term
What is a FACE
Definition
A collection of vertices that make up a plane that has acoustic properties
Term
Why is a transformer required at each speaker in a distributed system
Definition
Commercial power distribution
and Step down voltage
Term
What three Voltages are commonly used for constant voltage audio systems
Definition
100 volts
70.7 volts
and 25 volts
Term
What is the industry rule of thumb used when figureing required amp output wattage for a constant voltage system
Definition
Total tap wattage + 20% amp wattage or total tap wattage x 1.2 = amp wattage
number of speakers
zones and control
wire requireement
Amp Requirement
Term
What are the two field components that make up a radio wave
Definition
Electric
and
Mechanical
Term
Name two types of modulation
Definition
AM and FM
Term
What two types of audio processing are used in transmitting and recieveing
Definition
Pre and Post emphasis
and
COMPANDING
Term
What does the term"TRUE DIVERSITY" mean
Definition
true diverstiy is the ability to sample the radio feild from 2 or more locations and select or combind the resulting signal
Term
Name the two types of antenna Distribution
Definition
Passive and Active
Term
Name and explain some methods used to test a driver
Definition
9 VOLT BATTERY
dmm ohms continutiy
sine wave sweeper
Term
Name 3 benifits of using ferrofluid
Definition
Heat dicipation
Keep coil centered in the gap
Extra Mechanical damping
Term
Name 3 types of material used to make compression driver diaphrams
Definition
Alluminum
Titanium
Beryllium
Term
Why are we forced to deal with a systems gain structure
Definition
because there is no standard peak level or noise floor
Term
How many volts does 0dbu equal
Definition
.775
Term
What four methods are used to determine clip points in a system
Definition
on board lights
oscilliscope
Piezo tweeder
DMM
Term
How many Volts is + DBU ? 10 Db/20 X Reference Volts= Volts
Definition
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Term
Name the three common network topologies
Definition
The Ring The star The bus
aka
Ringo Star Rides The Bus
Term
What is Cobranet
Definition
Technology Cobranet is a combination of hardware network protocol and Firmware
Term
How many channels of digital audio can a system using cobranet carry on a 100 base t network
Definition
Cobranet can carry 6k4 channels of 20bit/48k audio over a switched 100 base t network
Term
What is the job of a conductor in a cobranet Systems
Definition
the conductor is the time keeper
Term
At what point should front fill speakers overlap
Definition
6db down at the front row of listeners or side step the speakers
Term
Name some important Considerations when using delay towers
Definition
Many small ones better than one big
Dont crank them make them transparent
Maintain same axis as the mains
Persue stereo at your own risk
Term
What is the difference between a directivity factor and a directivity index
Definition
Beam with expressed as Q and spl increase on axis compared to whole space
Term
Remeber we also have to wire one series speaker diagram
and one parallel speaker diagram
and for the math remeber to take impedance and divide it by the number of speakers
Definition
um ya
Email me at
Shenubs@hotmail.com if you found this shit use full
thanks alot folks good luck
two tone
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