Shared Flashcard Set

Details

ASP
ASP
27
Music
Undergraduate 1
04/20/2007

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Cards

Term
What is another common name for a constant voltage system
Definition
High impedance
Distributed
70 volt
Term
Where are constant voltage audio systems commonly used
Definition
Commercial Establishments
Term
Why is a Transformer Required at each speaker in a distributed system
Definition
Commercial Power distrobution
Step down Voltage
Term
What are three voltages that are commonly used for constant voltage audio systems
Definition
100 volts
70.7 volts
25 volts
Term
How are speakers rated in distribution systems
Definition
DBspl per wattage tap
Term
How many Speakers can be connected to an amp in a constant voltage system
Definition
As many as you want as long as you do not exceed amp capacity
also keep an eye on ohm load impedance
Term
Besides the power used by the speaker what are two other factors to concider when concering power loss
Definition
Transformer Insertion loss *(TIL)*
loss due to cable
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
Why should you turn on amps after you turn on all other electronic equipment in a sound system
Definition
So you dont get a pop in the system
Term
Name and explain some methods used to test a driver
Definition
9 volt battery
DMM ohms and continutity
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
What is dynamic range
Definition
Peack level minus noise floor
Term
What is thermal noise
Definition
Electric noise
Term
Why are we forced to deal with a systems gain structure
Definition
because there is no standard peak level or noise floor
Term
What is the benefit of laying out a systems gain structure on paper
Definition
Helps you make intelligent design and purpose decisions
Term
How many volts does 0dbu equal
Definition
.775
Term
What ways are attenuation ajusted to set a systems gain structure
Definition
on board and external
Term
How do we deal with aligning the crossover ouputs with each amplifier input it feeds
Definition
Each must be delt with as a seperate gain structure branch
Term
What is the purpose of a system limiter
Definition
early warning device that allows you to protect your system
Term
What ratio setting is best for a system limiter
Definition
8:1 or greater
Term
What four methods are used to determine clip points in a system
Definition
on board lights
oscilliscope
Piezo tweeder
DMM
Term
When using an oscilliscope to find clip points how do uou connect the positive and negative leads of the scope to the audio lines
Definition
Tie low to ground
Pin 3 to pin 1
positive to negative
Term
When physicaly setting gain structure
why do you first run signal through the system
Definition
see if it works to check systems integrity
Term
Why would we zero out an eq before attemting to set gain structure
Definition
Any cuts or boosts will affect callibration
Term
Audio montage
Definition
In a typical audio circuit it is beneficial to have the load impedance 10 times the source imp to insure efficient voltage transfer from device to device
Term
What is amplifier sensitivity
Definition
The amount of voltage required at input to produce full rate output
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