Ok, keep sighing, the avguide article I linked was from 2008, this forum post is from 1999 - http://www.audioasylum.com/audio/general/messages/57/10967.html "First, Locanthi related his experience of listening to a DAT tape that contained examples of low-bit-rate encoded music. He had requested the tape from Swedish Radio, the organization which conducted the official listening test of these systems. Almost immediately Locanthi heard several peculiar sounds in the music, the most obvious being an idle tone at 1.5khz. When Locanthi imformed Swedish Radio of this problem, they were surprised that they had not discovered it, but they did hear the 1.5khz artifact after it was pointed out to them. When Locanthi asked how such an obvious flaw could go undetected, the response was that he 'knew what to listen for'". Swedish Radio conducted "over 20,000 separate trials and 60 'expert' listeners". They failed to detect a flaw immediately apparent to a single listener. Their listening-test methodology--called 'hidden reference, double-blind, triple stimulus'--was beyond scientific reproach. Yet a single listener in 'unscientific' listening conditions immediately identified this fundamental problem." Interesting, let's see what Wikipedia says? "Subjective audio testing by experts, in the most critical conditions ever implemented, has shown MP2 to offer transparent audio compression at 256 kbit/s for 16-bit 44.1 kHz CD audio using the earliest reference implementation (more recent encoders should presumably perform even better)." Did you see the word "transparent"? Do you see a pattern here? Wikipedia article -> AESJ -> proven statistical error / failed test --- Let me guess, it's psi-missing, ね？ If you want to continue the discussion please post the relevant link on my wall.