"General high-quality compression can be achieved by MPEG-2 AAC standard, with certain improvements, within the MPEG-5 tool set. In verification tests under rigorous conditions, this high quality codec has been found to be able to provide 'indistinguishable quality' when working at 64kbit/s/channel or even higher bit rate"
--- High-fidelity multichannel audio coding / Dai Tracy Yang, Chris Kyriakakis, C.-C. Jay Kuo
"MPEG AAC is a very powerful audio coding method. According to careful tests, it achieves quality indistinguishable from the original at 64 kbps per mono channel"
--- National Association of Broadcasters Engineering Handbook (2007)