People might have subwoofers as part of their stereo system.

人们自家立体音响系统中可能有重低音喇。

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

低音喇时人们并不会听到什么特别的声音。

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，有点像低音炮。低音喇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， 可以听到低音喇的音乐、孩子们清晰的声音和男人们低沉的音符。