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HD [WHOAAA!]s – Made by Sennheiser. Sennheiser‘s Esfera microphone system provides 5.1 surround sound from just two channels, making complicated surround mic installations a thing of the past. The compact high-quality stereo microphone and 19“ processing unit are all you need to produce a complete 5.1 signal – anywhere in the production workflow, whether in real time or during post production.