HDMI cables have become an integral part of our everyday lives, but the length of such a cable can be crucial when it comes to the quality of the signal transmission.
HDMI cable maximum length: This is how far it can go
The maximum length of an HDMI cable depends largely on the type of cable used. By default, HDMI cables are designed for shorter distances, but you can find a solution depending on your application and requirements.
- Standard HDMI cable: These cables work up to 7.5 meters without noticeable signal loss. Beyond this point, the signal can be affected by increasing resistance and capacitance.
- High quality HDMI cables: If you need longer cables, high-quality versions (e.g. HDMI 2.0 or 2.1) are a better choice. These support higher bandwidths and enable distances of up to 15 meters without major losses, especially with 4K signals.
- Optical HDMI cables: If you need a length of more than 15 meters, you should switch to optical HDMI cables. These convert the signal into light and transmit it without significant losses, even over distances of 30 meters or more.
Longer HDMI cables: What you should consider
The longer an HDMI cable is, the higher the risk of signal loss. However, there are several ways to minimize these losses:
- Signal amplifier or repeater: These devices are placed between the cables and amplify the signal, giving you a stable image even over longer distances. They are particularly helpful at distances over 15 meters.
- Cable quality and shielding: For longer HDMI cables, ensure good EMI shielding and thicker cables to reduce resistance. High-quality cables often have gold-plated connectors, which improve contact and signal quality.
- Avoiding interference: Electromagnetic interference, such as from nearby power cables or other electronic devices, can weaken the signal. If possible, lay the cable so that it does not cross any sources of interference.