Anyone with a USB-c iPad requires USB-c DAC to connect headphones, with or without a dock. Docks can include 3.5mm audio jack and/or USB-c port. iPadOS software response to physical disconnection of headphone cable varies between 3.5mm audio jack or USB-c DAC. If 3.5mm is unplugged from either DAC or dock, iPadOS will continue to suppress on-board speakers.
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Anyone with a USB-c iPad requires USB-c DAC to connect headphones, with or without a dock. Docks can include 3.5mm audio jack and/or USB-c port. iPadOS software response to physical disconnection of headphone cable varies between 3.5mm audio jack or USB-c DAC. If 3.5mm is unplugged from either DAC or dock, iPadOS will continue to suppress on-board speakers.