Long HDMI runs to a ceiling projector can cause sparkles or a black screen. Pick your resolution to see the cable type to buy and how far each cable type usually reaches.
How it works
Higher resolutions and refresh rates need more bandwidth, and weak signals fade over copper wire. Standard (passive) copper cables work well for short runs. For longer runs, use an active cable with a built-in chip, or an optical fibre cable, which carries the signal much further.
The lengths shown are typical guidance. Cable quality varies a lot, so buy certified cables and test before you hide a cable inside a wall.
Frequently asked questions
Do I need an expensive HDMI cable?
No. A certified cable of the right type is enough. Price alone does not give a better picture over short runs.
What should I use for a ceiling mounted projector?
For a long run behind walls, an active or optical HDMI cable is the safer choice, especially for 4K.
Why does my projector show sparkles?
Sparkles or dropouts usually mean the cable is too long or does not support the bandwidth. Try a shorter or higher-rated cable.
