优点是制作相对容易，线性好、失真小、频响宽。
Advantage is relatively easy to produce, linear, and distortion of small, wide frequency response.
它具有极低的垂向幅频响应和相当宽的频带。
Its vertical frequency response is very low in a sufficiently wide frequency range.
它具有极低的垂向幅频响应和相当宽的频带。
Its vertical frequency response is very low in a sufficiently wide frequency range.
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