低频延伸指音响器材所能重放的最低频率。系用于测定在重放低音时音响系统或音箱所能下潜到什么程度的尺度。
... 指在音频低段的声音，通常低于500Hz（另一说则指低于160Hz）。 低频延伸（bass management） 倒相式音箱（bass reflex） ...
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低频延伸很强力，干净，收得紧，动态范围延伸出色、线性而自然。
Bass extension was forceful, clean, and tight, and dynamic range at both extremes was extended, linear, and natural.
虽然这不是大多数音乐中都会遇到的问题，但还是让我几次错过音乐的最后那点低频延伸。
While this was not an issue with most music, there were times when I missed that last octave or so of extension.
巨大冲程的低音喇叭通常有很差的低频延伸，需要有源EQ均衡电路来获得合理的低频响应。
Related to the issue above, large excursion woofers often have poor bass extension and require active EQ to get a reasonable bass response.
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