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In [this article](http://www.dpamicrophones.com/en/News/Archive/Press%20Releases/Katy%20Perrys%20sold-out%20California%20dreams%20tour%20relies%20on%20DPA%20Microphones%20headset%20mics.aspx), it states that "Katy Perry's engineering team relies on DPA Microphones’ 4088 Cardioid Headset microphones for all of the pop superstar’s live performances, including her current 'California Dreams' tour."more
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