Developed from the "classical" Sphäron, the new Excalibur is raising to a new standard of dimension and variability. In consideration of the fact that the former Sphäron had to be combined with a 12m² horn unit for transmission of the lowest frequencies, the new Excalibur now can easily be integrated into living rooms having a minimum size of 40m². Two towering pillars with four huge 15 inches woofers for each unit now are taking over the part of the low frequency horn unit.