What Sound Is

Sound is a pressure wave in a medium; separating source, room and ear is the first step in monitoring.

The problem

A good sound is rarely one thing. Room, microphone, speaker and ear all rewrite the same vibration; separate them or adjustments become guesswork.

Physics or room

Sound is a pressure disturbance in an elastic medium. A source pushes air; the air oscillates in place rather than travelling to your ear. At 20 °C sound moves at about 343 m/s. Frequency sets cycles per second, amplitude the size of the pressure change. No medium, no sound.

Practice and judgement

Run one-variable tests. With a clap, sweep or solo, change source position, listening position and level one at a time. Judge clarity, not loudness: does the low end hold, is the midrange masked, is the top harsh? Note what can be repeated.

What to listen for

Clap once and hear the gap between direct sound and reflections. Sustain a vowel and feel conduction through chest and skull. Play a solo line and separate attack, tail and noise. Repeat on headphones.

Common misunderstandings

Sound is a pressure wave, not air flowing to your ear. Decibels are ratios, and 0 dB is not silence. Sample steps are not heard as stairs; aliasing, clipping and the room are the real risks.

Listen in the library

12 Short Preludes for Organ, Set 1C13:20管风琴前奏曲的钢琴改编，持续音与低音声部适合分辨音头、余响与房间反射（C1）DetailsGao shan diaoC10:16单声部民歌《高山调》，素材简单，适合先听清声源本身的振动（C1）DetailswaveC12:00钢琴与低音的多轨爵士，用来对比单声源与合奏在房间里呈现的差别（C1）Details

All tracks from midicn-lib — inline badge is the license tier (C1 commercial / C2 non-commercial / C3 study only).

Sources

Everest, F. Alton，Master Handbook of Acoustics（McGraw-Hill）— 声学基础与房间章节核对，未引用
Howard, David M. & Angus, Jamie，Acoustics and Psychoacoustics（Focal Press）— 听觉与频率章节核对，未引用

Used for fact-checking only; all prose is original.

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