When the low-frequency sound wave propagates in the air, because the low-frequency wave is relatively long (the wavelength of 100Hz is 3.4M), in the normal environment, the objects in the room are mostly smaller or close to the wavelength, and the bass can easily bypass the object. Spread, so people are not sensitive to the orientation of the bass. The medium-high frequency (especially high-frequency) wave has a short wavelength (such as a wavelength of 10 kHz of only 3.4 cm), which is easily blocked by objects, reflected and absorbed. In general, to hear high notes, you must see the source of the treble.
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