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"For the duration of the tour, Beyoncé and Jay Z have relied on Sennheiser’s Digital 9000 wireless microphone system, which was purchased specifically for the tour by Eighth Day Sound Systems, Inc. at the recommendation of front-of-house engineer Stephen Curtin and monitor engineer James Berry – both veterans of the tour," states [this article](http://en-us.sennheiser.com/news-beyonce-and-jay-z-take-sennheiser-digital-9000-on-the-run-for-international-stadium-tour-).more
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