Do you like to watch movies in 4K? Choose a receiver with UHD, or Ultra HD. You also need this if you want to connect your 4K blu-ray player, for example. UHD is also known as 4K. This resolution is 4 times higher than Full HD. That means that the images are extra sharp. This allows you to see even more details. The receiver is the centerpiece of your home cinema set. Signals such as image and sound are sent to your television or speakers via the receiver.