This is Sebastian, I want to add that the main idea of doing this new approach was by Gregor a friend of Aldo (Sigma Acoustics) and Marcus and me. He is taking care of the acoustics in Aldo's listening room. He is well aware of the disadvantages of putting the speakers higher, however, everything is a trade off and one has to decide what gives the best overall result.
His point is that in the exhibition listening rooms it is not possible to play music at higher volumes because of the strong vibrations of the walls and floors and interference respectively. Also it is not possible to reduce low frequency vibration with carpets and light weight wood constructions, only heavy walls and floors would help to reduce their acceleration and sound emission respectively. This is mainly due to structure-borne sound transmission. The idea is to cut this transmission path between the speakers and the floor.
However, it is not possible to do this with a passive isolations system, because the speakers would excite the resonance of the isolator and one would get a forward and backward moving speaker. This would lead to modulations and doppler-effects in the sound basically at 4Hz, which is most critical and audible by the human ear, all not acceptable. Thus we have to use the Seismion Atlas system, which has very high damping and isolation performance and virtually no movement, this you will see at the high-End show - the difference between On and Off.
What we hope to achieve in the listening room at High-End is a perfect bass and midrange reproduction. I also think that the amount of bass won't be affected much by putting the speakers 15cm higher (the speakers have a hight of 185cm), because the bass loudness is significantly affected by the listening volume, I think much much more than by the distance to the floor.