# Pro AV Index

> Independent reference for professional AV: LED displays and video walls, digital
> signage, conferencing systems and network audio. Sizing guides, free calculators,
> a supplier directory and a working glossary for integrators and consultants.
> No manufacturer advertising or sponsored placement.

## Calculators
- [LED Pixel Pitch Calculator](https://proavindex.com/tools/pixel-pitch/): Enter wall size and closest viewing distance; returns recommended pixel pitch, native resolution, cabinet count and estimated power draw.

## Guides — Display
- [LED Pixel Pitch and Viewing Distance](https://proavindex.com/guides/led-pixel-pitch-viewing-distance/): Why the 1:1 rule is a floor not a target, and the retina distance of 3.4x pitch.
- [LCD Video Wall vs LED](https://proavindex.com/guides/lcd-video-wall-vs-led/): Bezels, brightness, serviceability and cost per square metre compared.

## Guides — Audio & Control
- [Dante vs AES67 vs Milan](https://proavindex.com/guides/dante-vs-aes67-vs-milan/): Which audio transport to specify, on latency, switch requirements and interoperability.
- [Switch Requirements for Dante](https://proavindex.com/guides/switch-requirements-for-dante/): QoS, IGMP snooping, EEE and hop-count rules.

## Glossary
- [PTP](https://proavindex.com/glossary/ptp/): Clock synchronisation on audio networks.
- [AoIP](https://proavindex.com/glossary/aoip/): What audio over IP replaces and demands.

## Reference
- [Supplier directory](https://proavindex.com/directory/): Indexed Pro AV manufacturers with product lines, ownership and supported interfaces.
- [News](https://proavindex.com/news/): Dated, sourced industry items.
- [About & methodology](https://proavindex.com/about/): Who runs this, how it is funded, how entries are researched.