Term
| What is another common name for a constant voltage system |
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Definition
High impedance
Distributed
70 volt |
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Term
| Where are constant voltage audio systems commonly used |
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Definition
| Commercial Establishments |
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Term
| Why is a Transformer Required at each speaker in a distributed system |
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Definition
Commercial Power distrobution
Step down Voltage |
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Term
| What are three voltages that are commonly used for constant voltage audio systems |
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Definition
100 volts
70.7 volts
25 volts |
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Term
| How are speakers rated in distribution systems |
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Definition
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Term
| How many Speakers can be connected to an amp in a constant voltage system |
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Definition
As many as you want as long as you do not exceed amp capacity
also keep an eye on ohm load impedance |
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Term
| Besides the power used by the speaker what are two other factors to concider when concering power loss |
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Definition
Transformer Insertion loss *(TIL)*
loss due to cable |
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Term
| What is the industry rule of thumb used when figureing required amp output wattage for a constant voltage system |
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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 |
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Term
| Why should you turn on amps after you turn on all other electronic equipment in a sound system |
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Definition
| So you dont get a pop in the system |
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Term
| Name and explain some methods used to test a driver |
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Definition
9 volt battery
DMM ohms and continutity
Sine wave sweeper |
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Term
| Name 3 benifits of using ferrofluid |
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Definition
Heat dicipation
Keep coil centered in the gap
Extra Mechanical damping |
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Term
| Name 3 types of material used to make compression driver diaphrams |
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Definition
Alluminum
Titanium
Beryllium |
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Term
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Definition
| Peack level minus noise floor |
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Term
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Definition
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Term
| Why are we forced to deal with a systems gain structure |
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Definition
| because there is no standard peak level or noise floor |
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Term
| What is the benefit of laying out a systems gain structure on paper |
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Definition
| Helps you make intelligent design and purpose decisions |
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Term
| How many volts does 0dbu equal |
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Definition
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Term
| What ways are attenuation ajusted to set a systems gain structure |
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Definition
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Term
| How do we deal with aligning the crossover ouputs with each amplifier input it feeds |
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Definition
| Each must be delt with as a seperate gain structure branch |
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Term
| What is the purpose of a system limiter |
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Definition
| early warning device that allows you to protect your system |
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Term
| What ratio setting is best for a system limiter |
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Definition
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Term
| What four methods are used to determine clip points in a system |
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Definition
on board lights
oscilliscope
Piezo tweeder
DMM |
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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 |
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Definition
Tie low to ground
Pin 3 to pin 1
positive to negative |
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Term
When physicaly setting gain structure
why do you first run signal through the system |
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Definition
| see if it works to check systems integrity |
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Term
| Why would we zero out an eq before attemting to set gain structure |
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Definition
| Any cuts or boosts will affect callibration |
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Term
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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 |
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Term
| What is amplifier sensitivity |
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Definition
| The amount of voltage required at input to produce full rate output |
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