150 to 250 Hz is the frequency of the small bass frequency range and the lower harmonics, which affects the fullness and thickness of the trumpet tone. If this band is given a certain boost, the tone of the trumpet will appear thick.
5 to 7.5 kHz is a frequency band that expresses the brightness of a small tone. If this band is given a certain boost, the tone will appear crisp, translucent, and sensitive and subtle; if this band is lacking, its tone will become very faint. .
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