关于吉他音箱：当我们调节 Presence 旋钮时，哪些参数发生了变化？
很多电吉他音箱都有一个 Presence 旋钮，似乎常被叫做「临场度」、或者「松散度」，当我们调节 Presence 时，声音的哪些参数发生了变化？这…
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答案：中高频。
In an amplifier, a presence control boosts the upper mid-range frequencies to make the sounds of voices and instruments with similar tonal ranges seem more "present".
Valve power amplifiers often provide an additional presence control (which reduces negative feedback in the power amplifier section) to provide a small amount of boost at frequencies above the treble control.