There are good and bad subscription services, it has always been like that. >Also, if you load 320kbps MP3 and 14.4khz WAV into a spectral analyzer you will fi

There are good and bad subscription services, it has always been like that. >Also, if you load 320kbps MP3 and 14.4khz WAV into a spectral analyzer you will find differences, which will be detectable to anyone with the right critical listening skills. Do you listen with your eyes? A spectrogram can't tell you what your ears will hear. The only way to know, is to do a proper double blind ABX test on files you encode yourself from known original files. You can use Foobar2000 with the ABX Comparator plugin for this purpose. I think you'll be surprised at just how low you can take the bitrate even on an ancient format like MP3, before you can tell a difference.