小葉兄,我猜会不会是Foobar自动降频?Ayre网站上的Foobar设置指导,
Start the Foobar 2000 application and then go to "File - Preferences". Select "Advanced - Playback - Fading". Then set "Fade on seek", "Fade out", and "Fade on pause" all to "0" milliseconds.
http://www.ayre.com/images/USB/Foobar/advanced_fade.PNG
The reason for selecting these settings is that Foobar 2000 offers automatic sample rate changes. If the program attempts to fade between two music files recorded at two different sample rates, it may create "popping" or "crackling" sounds during the fade.
而电脑上默认安装的Foobar,"Fade on seek", "Fade out", 和"Fade on pause" 这三项都是"100" milliseconds.