Live Sound
Live for for Eric
- 1.
If delay towers are positioned 200' from the Mains, under perfect atmospheric conditions, how many milliseconds of delay are required to make them reinforce the Mains properly?
- A.
50
- B.
117
- C.
178
- D.
225
- E.
500
Correct Answer
C. 178 -
- 2.
Generally a sound system should be operated _____dB below the onset of feedback.
- A.
3
- B.
6
- C.
10
- D.
12
- E.
24
Correct Answer
B. 6 -
- 3.
Feedback will occur when the SPL of the loudspeaker to the mic is _____ to the SPL of the performer to the mic.
- A.
+2 dB
- B.
+6 dB
- C.
Equal
- D.
-3 dB
- E.
-6 dB
Correct Answer
C. Equal -
- 4.
The best way to increase overall system gain is to
- A.
Increase the distance between the sound source and the mic
- B.
Decrease the distance between the sound source and the mic
- C.
Increase the distance between the loudspeaker and the mic
- D.
Decrease the distance between the loudspeaker and the mic
- E.
Decrease the distance between the sound source and the mic AND increase the distance between the loudspeaker and the mic.
Correct Answer
E. Decrease the distance between the sound source and the mic AND increase the distance between the loudspeaker and the mic. -
- 5.
The Inverse Square Law indicates that for each doubling of the distance from the source, sound pressure will drop by _____ dB.
- A.
2
- B.
4
- C.
6
- D.
8
- E.
10
Correct Answer
C. 6 -
- 6.
A 15 degree temperature variation will affect the speed of sound to approximately what extent?
- A.
2.2 feet per second
- B.
5.5 feet per second
- C.
10.1 feet per second
- D.
16.5 feet per second
- E.
20 feet per second
Correct Answer
D. 16.5 feet per second -
- 7.
In an outdoor venue, sound propagating into the wind
- A.
Will be refracted upward
- B.
Will be refracted to the left
- C.
Will be refracted to the right
- D.
Will be refracted downward
- E.
Sound is not affected by the wind
Correct Answer
A. Will be refracted upward -
- 8.
Crossovers are used to
- A.
Separate low/mid/high frequencies to different speakers
- B.
Combine low/mid/high frequencies to one speaker
- C.
Make sound enjoyable to diverse groups of people
- D.
All of the above
- E.
None of the above
Correct Answer
A. Separate low/mid/high frequencies to different speakers -
- 9.
A direct box is used to
- A.
Provide phantom power
- B.
Convert a high impedance signal to a low impedance signal
- C.
Convert a low impedance signal to a high impedance signal
- D.
Provide phantom power and help prevent feedback
- E.
None of the above
Correct Answer
B. Convert a high impedance signal to a low impedance signal -
- 10.
An isolation splitter snake is used to
- A.
Send 2 or more separate matched output signals from a single input.
- B.
Send mic/line signals from one mixer to another
- C.
Connect crossover points to different amps
- D.
Chain left and right speaker cabinets together
- E.
Send signals to fill speakers
Correct Answer
A. Send 2 or more separate matched output signals from a single input. -
- 11.
For a mono PA system, the FOH console should always be placed
- A.
In front of the left or right main speaker stacks, between 30' and 90' from the stage
- B.
In the balcony, if there is one
- C.
In the center of the room, between 30' and 90' from the stage
- D.
On the stage, stage left
- E.
In front of the left or right main speaker stacks, between 40' and 100' from the stage
Correct Answer
A. In front of the left or right main speaker stacks, between 30' and 90' from the stage -
- 12.
In- ear monitor systems should always be used in conjunction with
- A.
EQ's
- B.
Digital Delay
- C.
Foldback Console
- D.
Limiters
- E.
Noise Gates
Correct Answer
D. Limiters -
- 13.
The headroom of a FOH system may be increased by
- A.
Turning down the amplifier's gain knobs
- B.
Turning up the output gain of the FOH compressor
- C.
Turning up the output gain of the FOH EQ
- D.
Adjusting the threshold and ratio of a compressor wired to the consoles main mix bus.
- E.
All of the above answers are correct
Correct Answer
D. Adjusting the threshold and ratio of a compressor wired to the consoles main mix bus. -
- 14.
What order should the FOH signal processing be wired for the main output bus of a console being used for live sound reinforcement?
- A.
Compressors, Eq, crossover, amps
- B.
Crossover, compressor, Eq, amps
- C.
Eq, compressor, crossover, amps
- D.
Gate, compressor, feedback eliminator, crossover
- E.
Feedback eliminator, crossover, amps
Correct Answer
C. Eq, compressor, crossover, amps -
- 15.
When mixing monitors from a FOH console, you should always use the
- A.
Aux sends in post fader mode
- B.
Aux sends in pre fader mode
- C.
Console's VCA's
- D.
Console's subgroup outputs
- E.
Console's matrix outputs
Correct Answer
B. Aux sends in pre fader mode -
- 16.
The power supply for all of the stage gear should come from:
- A.
A power point
- B.
A separate phase
- C.
A power distribution box
- D.
The amp rack
- E.
None of the above
Correct Answer
C. A power distribution box -
- 17.
In a PA system for the maximum protection, a compressor/limiter should be placed:
- A.
Post desk, pre EQ
- B.
Post EQ, pre crossover
- C.
Post crossover, pre amp
- D.
Post amp, pre speaker
- E.
Post speaker, pre audience
Correct Answer
B. Post EQ, pre crossover -
- 18.
Why are dynamic cardioid microphones rather than condensers the usual microphone of choice when working live?
- A.
Because they are more expensive
- B.
Because they are less sensitive, more durable and offer good off-axis rejection
- C.
Because they don't need phantom powering
- D.
Because they are more sensitive and have a wider frequency response
- E.
None if the above
Correct Answer
B. Because they are less sensitive, more durable and offer good off-axis rejection -
- 19.
You are asked to provide a sound system for an outdoor concert festival. The audience seating area is 200' long. You place a full range loudspeaker system that has a sensitivity rating of 110 dB SPL (1watt @ 1 meter) at the front of the seating area. The loudspeaker is capable of handling 500 watts continuous power. What will the maximum SPL be at the back of the seating area?
- A.
123 dBu
- B.
101dB-spl
- C.
94 dB
- D.
123 dB-spl
- E.
101 dB
Correct Answer
B. 101dB-spl -
- 20.
The part of the stage that is enclosed by walls or ceiling is known as _________?
- A.
The pit
- B.
The wing space
- C.
The apron
- D.
The proscenium
- E.
The green room
Correct Answer
D. The proscenium -
- 21.
The person who is known as the _______ will provide a sound reinforcement company with a stage plot of a specific performance set-up.
- A.
FOH Engineer
- B.
Tour Manager
- C.
Foldback Engineer
- D.
Stage Technician
- E.
Lead Singer
Correct Answer
B. Tour Manager -
- 22.
When setting up the channel inputs for a live production console, if applicable, it is usually best to place which instrument in the 1st position (channel #1)?
- A.
The lead vocal
- B.
The lead guitar
- C.
The snare drum
- D.
The bass guitar
- E.
The kick drum
Correct Answer
E. The kick drum -
- 23.
FOH amplifier racks should be placed _______ to the main speaker stacks.
- A.
Within 100'
- B.
Within 50'
- C.
Within 25'
- D.
As close as possible
- E.
Next to the FOH console, no matter where it's located
Correct Answer
D. As close as possible -
- 24.
If a concert has a noise floor of 40dB-spl, a 100dB-spl nominal program level (the average performance level) and a 130dB-spl peak level (the peak level of the performance), what is the headroom requirement for this concert's PA system?
- A.
30 dB-spl
- B.
90 dB
- C.
90 dB-spl
- D.
30 dB
- E.
45 dBu
Correct Answer
D. 30 dB -
- 25.
If a concert performance has a noise floor of 45dB-spl, a nominal program level of 110dB-spl and a 130dB-spl peak level, what is the dynamic range of this concert?
- A.
85 dB
- B.
85 dBu
- C.
85 dBv
- D.
85 dBm
- E.
85 dB-spl
Correct Answer
A. 85 dB -
- 26.
A loudspeaker array in a series connection that utilizes 4 speakers each with a spec of 100 watts (continuous) at 4 ohms will require an amplifier that is rated at:
- A.
100 watts (continuous) @ 16 ohms
- B.
25 watts (continuous) @ 8 ohms
- C.
50 watts (continuous) @ 16 ohms
- D.
100 watts (continuous) @ 8 ohms
- E.
50 watts (continuous) @ 4 ohms
Correct Answer
A. 100 watts (continuous) @ 16 ohms -
- 27.
How many splits are required to feed a Recording, Foldback, FOH and Broadcast console for a single live performance?
- A.
1
- B.
2
- C.
3
- D.
4
- E.
It's not possible to split to more than 2 places
Correct Answer
C. 3 -
- 28.
A concert P.A. should be run with at least ____dB of headroom to be considered adequate.
- A.
3 dB
- B.
6 dB
- C.
9 dB
- D.
10 dB
- E.
12 dB
Correct Answer
D. 10 dB -
- 29.
Maximum Acoustic Gain is defined as:
- A.
The maximum allowable level before the power amps clip.
- B.
The maximum allowable level before the loudspeakers overload.
- C.
The maximum allowable level before the pre-amps clip.
- D.
A L/R mix bus VU level of 0 (0VU)
- E.
The maximum allowable level before feedback occurs.
Correct Answer
E. The maximum allowable level before feedback occurs. -
- 30.
Using the measurements below, assuming all transducers are omnidirectional, how much available gain is allowed in this system before feedback begins? : Performer to Mic = 1ft (Ds) = 120dB-SPL Performer to Audience = 40ft (D0) Loudspeaker to Mic = 40ft (D1) Loudspeaker to Audience = 60ft (D2)
- A.
28.5 dB
- B.
35 dB
- C.
12.5 dB
- D.
88 dB
- E.
22.5 dB
Correct Answer
E. 22.5 dB -
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Feb 11, 2013Quiz Edited by
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Dec 15, 2011Quiz Created by
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