Effects of down-mix algorithms on quality of surround sound p.779-779. -- A study on head-shape simplification using spherical harmonics for HRTF computation at low frequencies p.799-805. -- Differences in performance and preference of trained versus untrained listeners in loudspeaker test: A case study p.806-825. -- Objective measures of listener envelopment in multichannel surround systems p.826-840. -- More comments on presidents message and comments p.841-842. -- 23rd conference report, Copenhagen p.846-871, News of the sessions p.861-880.