# Evaluation of Three Auditory-Sculptural Qualities Created by an Icosahedral Loudspeaker
## 4 Experiment 2: Refinement
### Conditions  
Aiming at a fine-grained increase of each of the quality attributes, a pool of 32 new conditions was composed for this experiment. Listening to these conditions in the given experimental setup (see [25]),the conditions of Table 2 were defined and sorted to establish a ranked set of 6 conditions per attribute: D1...D6 for a graded increase in directionality, P1...P6 for graded increase in plasticity, and C1...C6 for a graded increase of contour. DirectionalityThe beam of D1 with FM(5) is static and is therefore, not assumed to dynamically guide the listener's attention through the room. Although the more transient FG(3) would stick closer to the loudspeaker, D2 is supposed to produce more shifts of attention due to the concurrent combination of static beam and rotation. Consequently D3 using FM(5) for both the dynamic and static spatialization of D2 should exhibit a more pronounced directionality. Moreover, D4 alters D2 by using FM(5) for the dynamic spatialization while keeping FG(3) for the static one, which removes the grouping between static and dynamic sounds. This should process the distinctiveness of the dynamic spatialization and thus, directionality. The single rotation of PN(6) in D5 aims at producing shifts of direction to the reflective surfaces, in particular in the front and at the sides of the room. D6 is a combination of two counter-clockwise rotations with the PN(6) and by the coinciding beams at \(\{0,180^{\circ}\}\) every \(\{0,1\}\) s within a period of two seconds, it is supposed to produce the strongest condition of directionality in terms of a distinctive oscillation between front and back. ContourC1 presents PN(6) played back omnidirectionally. Therefore the auditory sculpture is supposed to be of uniform contour, temporally and from all listening positions. C2 uses PN(6) also statically but with a beam directed towards the blackboard, which aims at introducing a slight silhouette dependency. C3 uses a rotating beam of FG(3) that is expected to stay close to the IKO and yield more contour by the position-dependent and time-variant dominance of the wall reflections \begin{table}
\begin{tabular}{l l l l l} \hline \hline  & \multicolumn{4}{c}{**Directionality**} \\ \hline  & static beam 1 & static beam 2 & rotating beam 1 & rotating beam 2 \\ Cond. & snd, \({}^{\circ}\)Az/\({}^{\circ}\)El & snd, \({}^{\circ}\)Az/\({}^{\circ}\)El & snd, \({\rm ccw}^{\circ}\)/s & snd, \({\rm ccw}^{\circ}\)/s \\ \hline D1 & FM(5), 0/0 & & & \\ D2 & FG(3), 0/0 & & & FG(3), 180 \\ D3 & FM(5), 0/0 & & & FM(5), 180 \\ D4 & FG(3), 0/0 & & & FM(5), 180 \\ D5 & & & PN(6), 180 & \\ D6 & & & PN(6), 180 & PN(6), 180 \\ \hline  & \multicolumn{4}{c}{**Contour**} \\ \hline  & static beam 1 & static beam 2 & rotating beam 1 & rotating beam 2 \\ Cond. & snd, \({}^{\circ}\)Az/\({}^{\circ}\)El & snd, \({}^{\circ}\)Az/\({}^{\circ}\)El & snd, \({\rm ccw}^{\circ}\)/s & snd, \({\rm ccw}^{\circ}\)/s \\ \hline C1 & PN(6), omni & & & \\ C2 & PN(6), 0/0 & & & \\ C3 & & & FG(3), 180 & \\ C4 & & & FM(5), 180 & \\ C5 & PN(6), 0/0 & & & PN(6), 180 \\ C6 & FM(5), 0/0 & & & PN(6), 180 \\ \hline  & \multicolumn{4}{c}{**Plasticity**} \\ \hline  & static beam 1 & static beam 2 & rotating beam 1 & rotating beam 2 \\ Cond. & snd, \({}^{\circ}\)Az/\({}^{\circ}\)El & snd, \({}^{\circ}\)Az/\({}^{\circ}\)El & snd, \({\rm ccw}^{\circ}\)/s & snd, \({\rm ccw}^{\circ}\)/s \\ \hline P1 & PN(6), omni & & & \\ P2 & FG(3), 0/0 & & & \\ P3 & FM(5), 0/0 & & & FG(3), 180 \\ P4 & PN(6), 0/0 & & FM(5), 180 & FG(3), 180 \\ P5 & FG(3), 0/0 & & & PN(6), 180 \\ P6 & FM(5), 0/0 & & PN(6), 180 & FG(3), 180 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Description of the conditions of experiment 2, their sound material (as described in Section 2.1), and beam direction/rotation parameters. Beams use 3 rd-order unless otherwise indicated (Az...azimuth, El...elevation, cw...clockwise, ccw...counter clockwise, snd...sound). involved.