AET 2560 Final Test
Questions with
Correct Answers
What frequency bands are illegal to operate in? - Answer-700 MHz
What are the operational frequencies of VHF systems? - Answer-30-300 MHz
What are the operational frequencies of UHF systems? - Answer-300 MHz - 3 GHz
When using multiple wireless microphones, how far apart should the frequency bands
be? - Answer-Separate frequency bands by 1 MHz minimum.
What is squelch? - Answer-Like a gate, turns on and off the signal when audio is not
present
Looks at radio frequency.
Meters receiver when no signal is present.
What is the difference between limiting and compressing? Where is it appropriate to use
each? - Answer-
What is the side-chain input on a compressor? What are some examples of how it's
used? - Answer-Allows for external processing to influence detection circuit.
Can be used on a microphone input for ducking.
Compression control on music or a kick drum.
Filters/EQ - De-essing.
What is the difference between a gate and a downward expander? Where is it
appropriate to use each? - Answer-A noise gate turns volume down below specified
level; like on/off switch; can be used to reduce rumble bleed; tightening drums and
adding punch; and eliminating noise.
, A downward expander decreases gain below threshold; like an auto-fader; less likely to
cause feedback; can allow you to turn the level louder.
What is the advantage of using a stereo input channel over a reverb return? - Answer-A
stereo input is pre-fader because it's an insert, a reverb return is like a bus send and is
post fader
Personal PA - Answer-Smallest, can usually fit in your car; low-level of knowledge
Fixed Installation - Answer-Venues, with regular sound needs.
I.E. bars, churches, concert halls.
Band PA - Answer-Small to large venues; 10-2000 people.
Touring/Arena PA - Answer-Requires small army of people and trucks; extreme PA
system.
Portable PA - Answer-Taken from one location to another; no flexibility in venue
flexibility; rough on equipment; takes more knowledge to operate.
headroom - Answer-margin of dB that you leave between your average signal level and
the maximum signal level the system can handle.
crest factor - Answer-the most sound your system will encounter (ratio of peaks/average
sound)
harmonic distortion - Answer-two different frequencies in the sound system or
reproduced by the system and create a harmonically related frequency; sounds okay.
gain to feedback - Answer-one mic at given maximum available gain before audible
feedback
two "open" mics: 3dB less gain before audible feedback
four "open" mics: 6dB less gain before audible feedback.
eight "open" mics: 9dB less gain before audible feedback.
NL2 - Answer-Has 2 cables and 1 signal
NL4 - Answer-Has 4 cables and 2 signals.
NL8 - Answer-Has 8 cables and 4 signals.
What is a balanced cable? - Answer-Utilize common mode rejection; lets us eliminate
RFI/EMI; low impedance (>20ft); twisted pair configuration; 1 hot, 1 cold, 1
shield/ground.
Questions with
Correct Answers
What frequency bands are illegal to operate in? - Answer-700 MHz
What are the operational frequencies of VHF systems? - Answer-30-300 MHz
What are the operational frequencies of UHF systems? - Answer-300 MHz - 3 GHz
When using multiple wireless microphones, how far apart should the frequency bands
be? - Answer-Separate frequency bands by 1 MHz minimum.
What is squelch? - Answer-Like a gate, turns on and off the signal when audio is not
present
Looks at radio frequency.
Meters receiver when no signal is present.
What is the difference between limiting and compressing? Where is it appropriate to use
each? - Answer-
What is the side-chain input on a compressor? What are some examples of how it's
used? - Answer-Allows for external processing to influence detection circuit.
Can be used on a microphone input for ducking.
Compression control on music or a kick drum.
Filters/EQ - De-essing.
What is the difference between a gate and a downward expander? Where is it
appropriate to use each? - Answer-A noise gate turns volume down below specified
level; like on/off switch; can be used to reduce rumble bleed; tightening drums and
adding punch; and eliminating noise.
, A downward expander decreases gain below threshold; like an auto-fader; less likely to
cause feedback; can allow you to turn the level louder.
What is the advantage of using a stereo input channel over a reverb return? - Answer-A
stereo input is pre-fader because it's an insert, a reverb return is like a bus send and is
post fader
Personal PA - Answer-Smallest, can usually fit in your car; low-level of knowledge
Fixed Installation - Answer-Venues, with regular sound needs.
I.E. bars, churches, concert halls.
Band PA - Answer-Small to large venues; 10-2000 people.
Touring/Arena PA - Answer-Requires small army of people and trucks; extreme PA
system.
Portable PA - Answer-Taken from one location to another; no flexibility in venue
flexibility; rough on equipment; takes more knowledge to operate.
headroom - Answer-margin of dB that you leave between your average signal level and
the maximum signal level the system can handle.
crest factor - Answer-the most sound your system will encounter (ratio of peaks/average
sound)
harmonic distortion - Answer-two different frequencies in the sound system or
reproduced by the system and create a harmonically related frequency; sounds okay.
gain to feedback - Answer-one mic at given maximum available gain before audible
feedback
two "open" mics: 3dB less gain before audible feedback
four "open" mics: 6dB less gain before audible feedback.
eight "open" mics: 9dB less gain before audible feedback.
NL2 - Answer-Has 2 cables and 1 signal
NL4 - Answer-Has 4 cables and 2 signals.
NL8 - Answer-Has 8 cables and 4 signals.
What is a balanced cable? - Answer-Utilize common mode rejection; lets us eliminate
RFI/EMI; low impedance (>20ft); twisted pair configuration; 1 hot, 1 cold, 1
shield/ground.
