Live Sound 200 Final Exam Review Quiz 2023 Answered
Correctly
If you wired two 8-ohm speakers in series to a 4-ohm speaker in parallel what
would the total resistance be
3.2 ohms (Sum of the Reciprocals)
On a 3-phase power distro, if you were to measure VAC from red to blue, what
would you read?
208
The room's energy and the speaker's energy is equal at this point
Critical Distance
What is accomplished by performing a continuity test on a cable?
Finding out if it works
What level does a passive crossover work at?
Speaker Level
Phantom Power is direct current voltage
True (48VDC)
What are the 7 items needed to create a basic PA
1. AC Power
2. Input Device
3. Mixer
4. EQ
5. Crossover
6. Power Amp
7. Speaker
AM and FM represent what?
Amplitude Modulation and Frequency Modulation
3-phase power colors
Hot 1 (X)
Hot 2 (Y)
Hot 3 (Z)
Ground
Neutral
X: Black
Y: Red
Z: Blue
Ground: Green
Neutral: White
Power supply is what kind of voltafe
AC Voltage
Passive crossover works at what level
Speaker Level
Active Crossover uses what kind of voltage
DC Voltage
Microphone Preamplifiers use what kind of voltage
, Mil Leve
How fast do electrons move through analog equipment?
The speed of light, thus basically latency-free
A ground loop occurs when there is more than one ground connection path
between
two pieces of equipment
True Diversity means...
That the receiver has two antennas, each with it's own amplifier module
Antennas need to be _________ wave or larger when detached from a wireless
base unit, when extending the antennas
1/2 wave or larger
Frequency Agile wireless systems are considered to be
Wireless devices that operate on 2 or more frequencies
What types of cables have shields?
XLR/Mic Cable, TS/Instrument, RCA
What concepts of -10 and +4 represent when dealing with an equipments
specifications?
Output Levels vs Input Sensitivity
VHF and UHF stand for
Very High Frequency and Ultra High Frequency
What kind of voltage will a transformer pass?
AC
What is the primary difference between gating and expanding?
Ratio
What is the voltage and hertz rating for single phase power in the US
120V @ 60Hz
What is the voltage of -10DBU in DBV
.3 DBV
What is the voltage of a typical wall outlet in America
120 VAC
What voltage is supplied at a standard American wall outlet
120 VAC
How does latency relate to cable length
it doesn't
Is there latency from input to output of a speaker
yes
Is there latency in analog cabling
no
What is the approximate length, in feet, of a 100 Hz wave
10 feet
What is the period of 1000 Hz in milliseconds
1 millisecond
What is the approximate wavelength of 1000Hz
1 foot
T/F: Just using a DI to eliminate a ground look in a PA is enough
False
Correctly
If you wired two 8-ohm speakers in series to a 4-ohm speaker in parallel what
would the total resistance be
3.2 ohms (Sum of the Reciprocals)
On a 3-phase power distro, if you were to measure VAC from red to blue, what
would you read?
208
The room's energy and the speaker's energy is equal at this point
Critical Distance
What is accomplished by performing a continuity test on a cable?
Finding out if it works
What level does a passive crossover work at?
Speaker Level
Phantom Power is direct current voltage
True (48VDC)
What are the 7 items needed to create a basic PA
1. AC Power
2. Input Device
3. Mixer
4. EQ
5. Crossover
6. Power Amp
7. Speaker
AM and FM represent what?
Amplitude Modulation and Frequency Modulation
3-phase power colors
Hot 1 (X)
Hot 2 (Y)
Hot 3 (Z)
Ground
Neutral
X: Black
Y: Red
Z: Blue
Ground: Green
Neutral: White
Power supply is what kind of voltafe
AC Voltage
Passive crossover works at what level
Speaker Level
Active Crossover uses what kind of voltage
DC Voltage
Microphone Preamplifiers use what kind of voltage
, Mil Leve
How fast do electrons move through analog equipment?
The speed of light, thus basically latency-free
A ground loop occurs when there is more than one ground connection path
between
two pieces of equipment
True Diversity means...
That the receiver has two antennas, each with it's own amplifier module
Antennas need to be _________ wave or larger when detached from a wireless
base unit, when extending the antennas
1/2 wave or larger
Frequency Agile wireless systems are considered to be
Wireless devices that operate on 2 or more frequencies
What types of cables have shields?
XLR/Mic Cable, TS/Instrument, RCA
What concepts of -10 and +4 represent when dealing with an equipments
specifications?
Output Levels vs Input Sensitivity
VHF and UHF stand for
Very High Frequency and Ultra High Frequency
What kind of voltage will a transformer pass?
AC
What is the primary difference between gating and expanding?
Ratio
What is the voltage and hertz rating for single phase power in the US
120V @ 60Hz
What is the voltage of -10DBU in DBV
.3 DBV
What is the voltage of a typical wall outlet in America
120 VAC
What voltage is supplied at a standard American wall outlet
120 VAC
How does latency relate to cable length
it doesn't
Is there latency from input to output of a speaker
yes
Is there latency in analog cabling
no
What is the approximate length, in feet, of a 100 Hz wave
10 feet
What is the period of 1000 Hz in milliseconds
1 millisecond
What is the approximate wavelength of 1000Hz
1 foot
T/F: Just using a DI to eliminate a ground look in a PA is enough
False
