What device can be used to prevent EDID table recalculation to a lower resolution when replacing a monitor?

The use of a scaler is particularly effective in preventing the EDID (Extended Display Identification Data) table from recalculating to a lower resolution when a monitor is replaced. Scalers work by converting video signals from one resolution to another and can manage EDID information effectively, ensuring that the output resolution remains consistent with what is expected by the source device.

When a new monitor is connected, it presents its own EDID information, which may indicate a lower resolution capability than the previous monitor. A scaler can maintain the original video output settings by interpreting the EDID data and providing a compatible signal that matches the desired resolution. This way, the content remains at the appropriate quality without being downgraded based on the new monitor's capabilities.

Other devices mentioned, like video switchers, amplifiers, and routers, play different roles in AV setups. Video switchers manage the input sources and outputs to different displays, amplifiers boost video/audio signals, and routers direct network traffic. However, none of these devices are specifically designed to manipulate EDID information and maintain resolution integrity in the way that scalers can.