Conclusions (preliminary yet)
• The loudspeakers are generally judged more natural than the headphones
• The frontal (single) stereo dipole is the system providing the better result/effort ratio: it works with a normal stereo system, it does not require a lot of computational power for running the inverse filters in real time, and is generally very natural and provides good localization
• Adding the second stereo dipole gives some advantages, but generally they are not worth the extra effort required (4-channels processing, etc.)
• The normal stereo gives very poor localization, and the perceived spectrum changes with the direction of the sound source, so the “colour” of the sound is not preserved
•  It is very important to provide a confortable user’s interface: large LCD screen, wireless mouse, comfortable seat, proper lighting, thermohygrometric confort.