Norbert Wessel explains that although it is function of the TTL33-A acoustic design to be able to EQ and level the pattern control via DSP, in Dortmund the optimisation is only carried out by the mechanical curving of the array. “As a result, we maintain maximum audio output and constant behaviour over the whole array up to highest levels.”
Both Norbert Wessel and Georg Hofmann are impressed by the results. “The use of active speakers has certainly enhanced the frequency range. I was impressed how constant the audio is ±2dB in the special voice range between 400Hz-4-5K. You barely hear the crossover at all.” fulfil themselves had wanted more control in the frequency range, rather than sheer PA levels, according to project engineer, Lars Bendfeldt. With bases in Gelsenkirchen and Dortmund, his company has been responsible for installation, such as intercom and power supplies, since the last system was installed 13 years ago.
It was in 2000, that Germany won the FIFA World Cup bid, as a result of which the stands were further extended. In a stadium originally built in 1974 (to hold 54,000 people) four new stands were built to fill the corners between the existing grandstands bringing the capacity up to its present 80,720 (standing and seated.