A sharp sound means high frequency. The opposite is low frequency. The noise here is not ordinary sound, but voltage interference. There is no detailed boundary between high frequency and low frequency, and the causes of each are different. , high frequencies can bring a feeling of transparency, gorgeousness or harshness. The mid-range will give a solid feel. Low frequency will bring a sense of atmosphere and thickness. Or the sound of mud. Because frequency is one of the inherent properties of sound, the sound itself will have low, middle and high frequencies. If you ask what effect the three frequencies will have on the sound, it is equivalent to asking what effect the length, width and height will have on the object. Too broad. Of course, when subdivided, each frequency band can be further divided into many different ranges corresponding to different feelings.