配置：2路对称，双低频，三高频。
从箱体阻尼损失来看，导向孔和双反射带通箱设计在极低频下比密封箱和单反射式带通箱设计有着更大的失真。
Related to the loss of enclosure damping, ported and dual-reflex bandpass designs also exhibit higher distortion levels at very low frequencies than sealed or single-reflex bandpass designs.
通过对传统双路径滤波器的积分支路的改进，使积分支路的可适用频率范围展宽，而低频输出噪声减小。
The integration path can work in wider frequency range and the low frequency output noise is reduced by improving the conventional integration path.
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