Use free tools like Spek (spectrogram) or Fakin’ The Funk? . A genuine FLAC will show frequency response up to 22.05 kHz (Nyquist limit for 44.1kHz). A fake upscaled MP3 will show a sharp cut-off at 16-18 kHz.
A proper 2011 FLAC rip of The Ultimate Collection should be at standard CD resolution: . While hi-res (24-bit) versions exist of individual albums, the 2011 Ultimate Collection is native to CD. True FLAC ensures a bit-perfect copy of the original master. sade the ultimate collection 2011 flac vt