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55 Cards in this Set
- Front
- Back
The amplitude of sound in a room is usually measured in?
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dB SPL
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Jerry is planning on upgrading the PA power amplifiers for his band called Jerry's Kids. The power amps he currently has are rated at maximum output of 10 Watts. The power amps he wants to buy are rated at a maximum output of 1,000 Watts. The dB gain going from 10 Watts to 1,000 Watts is about?
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20 dB
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An example of an acoustic absorber is?
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a Helmholtz resonator
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The reference quantity in the dB formula is?
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variable depending on the type of dB
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A pad is?
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a one or two step volume control.
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The human ear is most sensitive at which frequency?
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3 k Hz
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The cochlea?
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is fluid-filled & contains hair-like cells
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dBm is a measurement of?
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power
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For high SPL and rough handling the best mic type would be?
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dynamic/moving coil mics.
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A ratio of 2 watts to 1 watt would be?
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3 dB
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An absorption co-efficient of 1 means?
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all sound absorbed
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Microphone level is usually around?
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– 60 dBu
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Moving a conductive wire within a permanent magnetic field will cause?
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induced Voltage
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Sound travels through air by?
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compression waves
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Balanced inputs have what advantage over unbalanced inputs?
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CMR noise rejection
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What is the purpose of side and rear entry ports on a microphone?
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to create a cardioid pickup pattern through destructive interference.
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A notch filter would have?
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a very high Q
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Tinnitus is?
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a ringing or whistling in the ear
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In electronic terms "low Z" would stand for?
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low impedance
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Sine waves have?
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no harmonics
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An absorption co-efficient of 1 means?
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all sound absorbed
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Microphone level is usually around?
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– 60 dBu
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Moving a conductive wire within a permanent magnetic field will cause?
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induced Voltage
|
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Sound travels through air by?
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compression waves
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Balanced inputs have what advantage over unbalanced inputs?
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CMR noise rejection
|
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What is the purpose of side and rear entry ports on a microphone?
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to create a cardioid pickup pattern through destructive interference.
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A notch filter would have?
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a very high Q
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Tinnitus is?
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a ringing or whistling in the ear
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In electronic terms "low Z" would stand for?
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low impedance
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Sine waves have?
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no harmonics
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What is the wavelength of a 50 Hz sound wave?
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22.6 ft
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When might you use the high pass filter provided on some mics?
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to compensate for proximity effect
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Sound travels through air by?
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compression waves
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The higher the frequency the_____ the wave length?
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shorter
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If two sine waves with the same frequency and amplitude but 180 degrees out of phase are combined the resilt will be?
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cancellation
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This part of the ear that helps us localize sound by causing comb filtering is the?
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pinna
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Moving a conductive wire within a permanent magnetic field will cause?
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induced Voltage
|
|
What is the purpose of side and rear entry ports on a microphone?
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to create a cardioid pickup pattern through destructive interference.
|
|
Balanced inputs have what advantage over unbalanced inputs?
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CMR noise rejection
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Which of the following describes the slope of a filter?
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dB per octave
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Most budget mixers as well as home stereos have this kind of EQ for the Treble and Bass?
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shelving
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Many control rooms and studio rooms use diffusers to?
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scatter reflections in different directions
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When a sound wave strikes a wall the angle of reflection is equal to the angle?
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of the incidence wave
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A dual-diaphragm mic would have which special function?
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various pick up patterns
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When might you use the high pass filter provided on some mics?
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to compensate for proximity effect
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A notch filter would have?
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a very high Q
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For high SPL and rough handling the best mic type would be?
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dynamic/moving coil mics.
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In electronic terms "low Z" would stand for?
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low impedance
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Sine waves have?
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no harmonics
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Which frequency is most likely to diffract around a large obstacle?
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20 Hz
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For a given center frequency as the Q grows larger the bandwidth?
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gets smaller
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440 Hz is the fundamental frequency of concert "A". A note 2 octaves above concert "A" will have a fundamental frequency of?
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1,760 Hz
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Which of the following is an example of coincident stereo mic technique?
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two bi-directional mics with a 90 degree angle and no horizontal spacing
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In the free field if you double the distance from the sound source the dB SPL will go down?
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6 dB SPL
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Anthony was listening to his IPod at a comfortable level of about 80 dB of SPL. Suddenly his Mom powers up her new industrial vacuum cleaner outside his room causing him to miss his favorite part of the song. This is an excellent example of?
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masking
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