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We just want to switch multiple HDMI sources to one display room.
Do we need a video wall processor, or is a standard HDMI matrix switcher enough?
No, you do not need a video wall processor for that. A video wall processor is for splicing one image across multiple screens.
If you only want to switch several HDMI sources to a single display, a standard HDMI Matrix Switcher (4×4, 8×8, 16×16) is exactly what you need — and it is simpler and more cost-effective. You can also get the WEB GUI version for easy control from a laptop or tablet.