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cliffsutherland
on FreezingBlue Flashcards.
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Whats the voltage in the wall? Whats the Freq?
120v, 60Hertz
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What is ground hum?
The result of the leakage of AC into the audio circuit.
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What are electrical breakers rated in?
Amps
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Audio cables should be bundled with power cables,
T/F?
False.
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Surge compressors cleans up incoming voltage and regulates it.
T/F?
False.
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Electrons are negatively or positively charged?
Negatively.
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What do resistors limit?
Current.
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What are the three formulas for voltage?
- - E=IR
- - E=P/I
- - E= square root of (P*R)
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What are three formulas for Current?
- - I=E/R
- - I=P/E
- - I=Square root of (P/R)
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What are three formulas for Resistance?
- - R=E/I
- - R=E(squared)/P
- - R=P/(squared)
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What are three formulas for power?
- - P=IE
- - P=E(squared)*R
- - P=I(squared)/R
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To cut down electrical hum, all audio needs to be on the same circuit.
T/F?
False.
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What is the formula for total resistance for a parallel circuit?
- 1
- -----------------------
- 1 1 1
- --- + --- + ---
- R1 R2 R3
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What is the definition of impedance?
Total opposition to current in an AC circuit.
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Z - Impedance
X- Reactance
L- Inductance
C- Capacitance
- Z is measured in Ohms
- X is measured in Ohms
- L is measured in Henries
- C is measured in Farads
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Name the resistor color codes.
For GREY, RED, BLUE
- 0 - Black 6- Blue 1- Brown 7- Violet
- 2- Red 8- Gray
- 3- Orange 9- white
- 4- Yellow
- 5- Green 52,000,000
- ---------------------------------------------------------------
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Transformers have two windings called?
Primary and secondary.
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Transformers are not used for what?
Power gain
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The AES standard for a 3 pin XLR audio cable?
- Pin 1= Ground
- Pin 2= Hot
- Pin 3= Cold
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What is the acronym for electro-magnetic field?
EMF
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Radio Freqency interferance is ?
RFI
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Define distortion?
Unwanted alterations of the waveform.
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If you lift or disconnect the ground will pass signal?
YES
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Do Power amps get turned on first or last?
Last
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Since left and right is critical, Should walls of a controll room be Parallel?
False
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3 way speaker system refers to what?
the # of speakers and/or frequency range devided into 3 groups.
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The wattage or power rating of the amp should be less than the speaker?
T/F?
False, should always be more.
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Power amps at 100 watts through 4 ohms vs 80 watts?
T/F?
False
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SN Ratio =
signal to noise ratio
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Which is larger, dynamic range, or SN?
Dynamic range.
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How can balanced outputing device be interfaced to unbalanced input of another device?
Short cold to ground
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The DI box serves what purpose?
The anwer will be all of the above
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Whats the difference between active and passive?
- Active needs an outside power source.
- Passive does not require and outside power source.
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Which has a hotter output? Professional or consummer grade?
Professional grade.
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10 K output impedance is an example of high or low?
High
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Diffusion is?
The reflection of certain freq over others
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What has higher destortion specifications, Active or Passive?
Passive.
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What is slew rate?
measurment of amps ability to respond to transients
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What is clipping?
amplitude distortion, or peaking.
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Identift decibel scale.
DBV=?
DBU=?
- DBV= consumer
- DBU= professional
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