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原帖由 lipusibuxiu 于 2023-9-9 12:11 发表 
竟然看到R版分享听感了，其实听感比参数不好写哈哈哈。传输线比倒相箱速度快吗？按我想的，传输线从后面多走了一米多，再绕到音箱前面，应该比喇叭发声延迟了2米左右？KH805真是好炮，配上去以后低音比高音还平整。 ...
关于倒向管和传输线延迟的这个问题SOS的Phil Ward（是Acoustic Energy AE22监听箱的设计师之一）解释过：
https://www.soundonsound.com/reviews/pmc6-2
"Phase reversal implies a minimum time delay of however long half a cycle takes at the frequency in question (40Hz, for example is a typical port frequency, and half a cycle is 12.5ms), and the nature of a resonance is that it rings on after its stimulus signal has stopped. So a reflex‑loaded speaker typically has trouble following the ups and downs of a stimulus signal as accurately as a closed‑box speaker — it’s always playing catch‑up or overshooting."
倒向管相位反转180度，而传输线原理是1/4倍波长谐振管，相当于相位延迟360/4 = 90度。从这个角度，似乎传输线的延迟比倒向管低1/4个周期。这似乎也符合传输线比倒向管Q值低的理论。
举个例子，如果是倒向管工作在55hz，延迟是9ms，相当于声波走了3.11米。而传输线是走了1.5m左右，也就是说大家都有延迟，传输线理论上说延迟可能要低一些。他们延迟都比密闭箱高。你可以认为传输线是一个密闭箱和倒向式之间的一个妥协，或者说好听点两边好处都想沾一点。
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本帖最后由 racingpht 于 2023-9-9 23:14 编辑 ]
