I have yet to find the encoder that encodes The Downward Spiral good enough where I can't AB test it from the CD. The album is neigh unlistenable on Youtube.
That particular disc seems to have been made at the cross roads time during which seamless natural-sounding digital effects were possible in music, but were still blocky enough in implementation to cause some type of Moire effect with digital encoders.
There are certain trouble files that can't be encoded well with MP3 even at 320k. I once successfully ABXY tested one such file 20 times in a row.