The Digital AV adapter from Apple will cost you around $50. This connection Hub sports a lightning port on one end. At the other end, there is a mini HDMI cable connector. HDMI connection itself carries the Audio. Even if the content is being piped on to a VGA display it can be used efficiently.
The interface on the iPhone can be mirrored exactly on the TV screen with the Lightning connector. Everything, including the apps, photos slideshows, videos, web pages etc can be viewed on the HDMI compatible TV display. This connector can deliver display up to 720p HD. Video mirroring is universally supported for HDMI devices.