Audio
What term is used to describe how the loudness of sound is measured?
Decibels
What does the audio term "gain" refer to?
The amount of amplification applied to a signal
What is comb filtering?
A phenomenon that occurs when the array of speakers lacks a uniform response.
When a device that converts energy from one for to another
Transducer
Often used for paging systems
70v amplifier
What is the value of log1000?
3
What are the risks of having a large number of speakers on just one amplifier?
Overloading the amplifier and potential distortion or damage
What practices help prevent radio frequency interference (RFI) and electromagnetic interference (EMI)?
What practices help prevent radio frequency interference (RFI) and electromagnetic interference (EMI)?
Microphone that attaches typically to a musical instrument?
Contact Pickup.
Uses 2 conductors and a shield
Balanced Line
How does a Cardioid Microphone work?
It picks up sound primarily from the front and sides while rejecting sound from the rear.
What does an audio amplifier increase?
Amplitude (power) of the audio signal
What does the term “flying” mean in context of audio systems?
Suspending from ceiling
Has a heart shaped pickup pattern
Cardioid
Two basic types of audio amplifiers
Voltage and power
What is the pickup pattern of omni-directional microphones?
360 Degrees
What are circuits called that have a load impedance that is 10 times the source or input impedance?
Bridged Circuit
How loud is the sound that begins hearing damage?
120 dB
Device that allows different speakers to work together in a speaker.
Crossover
Average sampling time for a VU meter
300 ms
What do popping sounds from an amplifier indicate?
Clipping or Harmonic Distortions
What is the range of a peak program meter (PPM)?
24 to 26 dB
Which sound is for active listening?
Foreground
Resistance of four 8Ω speaker wired in parallel
2Ω
Meter that measures how loud a sound is
SPL Meter
(Sound Pressure Level)