| 摘要 |
To lower the resonant frequency of a loudspeaker box equipped with loudspeakers, a bass with its own housing is mounted on the inside and supplied with low-frequency sound vibrations or infrasound noise which is sufficiently damped in the audible range, the fundamental sound wave length of which can be several kilometres; matched to the original resonant frequency and phase radiation. To achieve a significant acoustic spatial depth by artificial means, a forceful injection is required, taking into consideration a perceptibly interference-free operation of the loudspeaker box.
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