Ludicrous combination of iPhone 6, Lightning to 3.5mm adapter, and Sennheiser HD800 :-).
Well, as you likely already know, since the iPhone 7, Apple has removed the 3.5mm headphone port from their phone devices. Ostensibly, the rationale being that this would allow more space in the device for other goodies to enhance the feature set of the phones.
In place of the missing headphone port,
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