YouTube TV is finally rolling out 5.1 Dolby surround sound audio support — which has been among users’ biggest requests — and is launching a premium “ 4K Plus” service tier.

Assuming the customer has a 4K-capable TV, Xfinity X1 customers can now stream YouTube's 4K content directly through the maker's platform rather than using a Chromecast or other secondary device.

YouTube TV 4K Plus lets you stream select programs in Ultra HD. The add-on also supports offline viewing and unlimited simultaneous streams.