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An aph is a unit of measurement used to express the resolution or frequency response of audio systems. It stands for "amplitude per hertz" and refers to the amount of change in amplitude per unit of frequency. In audio systems, higher aph values indicate a wider dynamic range and better ability to accurately reproduce frequencies across the audible spectrum. It is commonly used in discussions about speakers, headphones, and other audio equipment. For example, if a speaker has an aph rating of 90 dB/Aph, it means that for every hertz increase in frequency, the sound level increases by 90 decibels. This measurement is important for audiophiles and professionals in the music industry who require precise and high-quality sound reproduction.

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