What does SPL measure?, Sound Pressure Level measures acoustic pressure on a logarithmic decibel scale., The pitch or frequency of a sound1, The electrical power consumed by a speaker, What is the standard reference pressure for SPL in air?, 20 micropascals, 1 micropascal (1 µPa), 1 pascal (1 Pa), What does RT60 mean?, The time required for sound level in a room to decay by 60 dB after the source stops., The time it takes a sound to reach 60 dB, The frequency response of a room measured for 60 seconds, What is dBA mainly used for?, Measuring sound with reduced emphasis on low frequencies, roughly reflecting human hearing sensitivity at lower listening levels., Measuring the electrical power output of audio equipment, Measuring only low-frequency vibrations below human hearing range, What is L-eq?, The steady sound level that contains the same total acoustic energy as a varying sound over a chosen period., The highest instantaneous sound level recorded, The lowest sound level measured during a given period, What does an FFT do?, It converts an audio signal from the time domain into frequency information., Automatically removes background noise from a signal, Increases the amplitude of all frequencies equally, What does an RTA display?, It shows sound energy across frequency bands, such as octave or one-third-octave bands., The electrical power consumed by an audio system, The reverberation time of a room at a single frequency, What is a swept-sine measurement?, A test in which a sine tone continuously moves through frequencies so the room’s response can be measured., A measurement made using a single, fixed-frequency tone, A measurement that uses only random pink noise across all frequencies simultaneously, What causes comb filtering?, A direct sound combines with a delayed reflection, producing regularly spaced peaks and dips in the frequency response., Excessive amplifier power causing the signal to clip, Random background noise entering the measurement microphone, What do ETC and RIR plots show?, They show when sound energy arrives: the direct sound first, followed by reflections and later room energy., The electrical impedance and power handling of a loudspeaker, Only the average frequency balance of music over time

Acoustics

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