Is it mono sound or stereo sound?

是立体声，可惜音质麻麻。

youdao

The Mozart "Requiem" with the Vienna Symphony, is from 1956 and is superb: taut, muscular, dramatic, and in very fine mono sound.

莫扎特“安魂曲与维也纳交响乐团”，是从1956年，是极好：拉紧，肌肉发达，戏剧，以及非常好的单声道声音。

youdao

A method for measuring the mono sound power in thermoacoustic resonator was developed by using the theory of plane wave decomposition.

提出了通过平面声波分解测量热声谐振管中单频压力波声功的方法。

youdao

From a recording point of view, the simple four-track, sometimes mono, sound and structure of the early songs seem dated, but the musical quality is undeniable.

BBC: CD Review: The Beatles