People might have subwoofers as part of their stereo system.

人们自家立体响系统中可能有重低喇叭。

Now, you can't hear when the speakers are switched on.

打开低喇叭时人们并不会听到什么特别的声。

These are specialized speakers. Kind of like sub-subwoofers. People might have subwoofers as part of their stereo system.

这些是非常专业的扬声器，有点像低炮。低喇叭常常作为立体声系统的一部分。

In a little while could be heard the music of the bass horns, the clear voices of the children and the men's deeper notes.

过了一会儿， 可以听到低喇叭的乐、孩子们清晰的声和男人们低沉的符。