装有双带通（double-bandpass）和12′单元，具有很强的低频处理效果。A1 SUB/DC配置了一个12′双音圈扩音器和内置无源转线路，适合与2组A1音箱配合使用。
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A novel planar dual-mode bandpass filter with double-corner cuts was proposed on the basis of traditional square patch dual-mode filter.
根据传统的方形贴片双模滤波器，提出了一种新颖的带有两个切角的平面双模带通滤波器结构。
A microwave bandpass filter on the double-sided HTS YBCO film was designed and fabricated and tested using a new coupling double-resonator.
设计、制作并测试了一种采用新颖耦合双谐振器结构的高温超导微波带通滤波器。
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