TiMax spatial acoustics for Europe’s largest natural stage
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St Margarethen Quarry is Europe’s largest natural stage: 65 metres wide and 25 metres deep, it is set in 7,000 square metres, with an audience capacity of 4,700. For Werner, the choice of TiMax was essential: “One reason is to have the possibility to achieve accurate localisation of the singers for as many listeners as possible. Another reason; the stage is a huge 100-ton steel structure, the whole of which is 3D-mapped and projected on with 16 high-power projectors. Due to this open design there are very few possibilities to hide large speaker systems.”
Adding a further level of complexity and challenge to the spatial reinforcement system’s design is the movement of the loudspeakers on stage. Speaker cabinets are integrated into the scenic structures which adorn the stage and as these scenery elements are moved at scene changes – and in some cases during the performance, the audio mapping must change accordingly. Explaining the ease with which TiMax object-based dynamic spatial control readily handles such a challenge, Werner states, “…with TiMax we blend the delay/ level settings for those speakers while they are moving to keep the acoustic experience for the listeners consistent.”
Werner’s sound design distributes multiple speaker systems across the vast stage area, all hidden from view within the stage and scenery. Approximately 60 speakers serve the stage. Twelve front fills in ‘cross-fire’ pairs, as well as a further 25 speakers in crossfire pairs or triplets, all with a narrow coverage of around 40-degrees, serve predominantly vocal localisation. These are delayed and leveled individually for multiple ‘source zones’ on the stage, relating to the areas from which the singers perform. “If a singer sings in the zone in front of one of the localisation speaker systems, all the speakers in that cluster play with zero delay. To the right of the zone, only the speakers pointing right play delayed
– and the same to the left: only the speaker pointing left is added and with this we try to reduce "wrong localisation" as much as possible.” he explains. Out Board director, Robin Whittaker, was on site during setup to assist with aligning and fine-tuning these spatial reinforcement and acoustic ambience enhancement TiMax objects.
The remainder of the speakers reinforce the orchestra and provide enhanced coverage for the back rows of the auditorium. Four line-array systems, in conjunction with the front fill systems, serve the orchestra reinforcement. A further two line-array systems delayed to the zones and reduced by 3-4dB enhance coverage to the back of the audience.
As well as vocal localisation, TiMax is employed as a multi-channel playback and immersive surround system, delivering enveloping sound effects plus playback of certain parts of the stage-band score, and even some pre-show and safety announcements. The stage band is pre-recorded and played back as though coming from the back left of the stage.
The surround effects system is also mapped in TiMax to create a virtual opera hall acoustic ambience around the audience. Early reflections are created for each source-zone individually and some longer reverberation added by external reverb engines spatially blended and similarly aligned to the surround and stage speakers. Also some special moving reverb effects are rendered in TiMax, e.g. a ghost singing offstage, ambient sounds flying around the audience.
Werner concludes, "With TiMax SoundHub we were easily able to create a flexible, high-channel count, directional acoustic reinforcement system using dynamically managed precedence. We had great support from TiMax during the phase of system-tuning in a very limited time-frame."