我的汽车音响系统升级成了立体声音响。

I upgraded my car audio to a ___stereo system.

这张专辑是用立体声录制的，听起来更有层次感。

This album was recorded in ___stereo, making the sound more layered.

他新车的音响系统音质很棒。

The ___stereo in his new car has amazing sound quality.