9AES. AES20--1996, AES recommended practice for professional audio--subjective evaluation of loudspeak- ers[EB/OL]. (2007-06-01) [2010-07-01]. http://www. aes.org/publications/standards/search.cfm?docID=24.
10ITU.ITU-R Recommendation BS.1116 (rev. 1) : Methods for the subjective assessment of small impairments in audio systems including muhichannel sound systems [S]. Geneva: ITU, 1997.
