The 使用 of 滤波器 to modify the 频谱 of a 声音 either for 创造力 效果（效应） or as a corrective A 图表 equaliser provides 控制 over a large 数 of 滤波器 twenty or more 盖 the 音频 范围（排列） allowing selected 频带 of 频率 to be cut or boosted One 应用（应用程序） is to 补偿 for any undesired 房间 共鸣 which might otherwise lead to inappropriate adjustments being made during the 录音 过程 the equaliser being applied between the monitor 输出 from the 混音 desk and the 主要 放大器 A 'parametric equaliser' is a tuneable 音 控制 giving variable 提升 or cut of a selected 频率 通常 also with a 控制 to vary the 频带宽度（带宽） 源 - Richard Dobson 1992 A 词典 of 电子 and 计算机 音乐 技术 牛津 University Press