您的计算机有一个扬声器端口（甚至可能有多个）和一个耳机端口。你可以把你的耳机**这两个耳机里，音乐就会出来，那么这两个耳机的真正区别是什么呢？

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

问题

超级用户阅读器C-dizzle想知道扬声器和耳机端口之间的区别（如果有的话）：

I have a 2.1 speaker setup going into my computer, but primarily plug them into the headphone jack as it is easier to access. I do this because I switch between a couple different devices with these speakers. At one point I plugged them into the speaker port and noticed a very slight difference in the volume. Now both volumes in the properties are at the same level, but the noise coming out was slightly different.

So do the 2 ports have different “levels” of output? Volume, bass, treble…?

那么区别是什么？你用哪一个真的重要吗？

答案

SuperUser contributor的突破提供了一些见解：

It depends on what hardware you have in the computer, but there usually is a difference between speaker and headphone ports – specifically, relating to the max/min speaker/headphone impedance values you can use with either port.

Certain sound cards, for example the Auzentech X-Fi-Forte, include a built-in headphone amplifier on the headphone port. Taking a look at the actual output port specificati***, we can also see different loading levels for the headphone and other line-out ports:

This is also why many sound cards specify to not use a passive (i.e. unamplified) speaker with certain ports, as the lower impedance may cause too much current draw, and possibly damage the particular port.

The general thing to note here, though, is impedance matching your speakers/headphones to the appropriate port, and in general, your speakers go to the speaker port, and your (unpowered) headphones go to the headphone port, precisely for the reas*** outlined above. This also explains why you might notice a slight difference in the volume levels between the two ports.

虽然体积差异在大方案中微不足道，但损坏硬件是一个可怕的结果；最好是在谨慎的一面出错，并使用适当的端口。

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