3 synchronized 4k outputs on Mac

[José Miguel Mayoral]

Hi

What's the best solution for synchronizing three 4K outputs from a Mac? That isn't too expensive? Something that doesn't require a Barco E2 or similar. It would be something like Datapah but that would allow me to synchronize three 4K outputs from a Mac.

Thanks.

[Alec Sparks]

I see these RGBlink units out in the wild: https://www.rgblink.com/productsinfo.aspx?id=232. You need a Mac Studio to drive it. They probably also make a box that accepts several 4k outputs and just synchronizes them, but I don't know which product that is.

I'm currently testing a 8K-in to (4) 4K-out variant of my Slice4 but it isn't quite ready yet (and frankly, I'm not sure how many QLab users require multiple 4K synchronized displays!)

[Sam Kusnetz]

On Oct 9, 2025 at 1:25:32 PM, Alec Sparks <al...@voxel.org> wrote:

I see these RGBlink units out in the wild: https://www.rgblink.com/productsinfo.aspx?id=232. You need a Mac Studio to drive it. They probably also make a box that accepts several 4k outputs and just synchronizes them, but I don't know which product that is.

Just to elaborate on this a little…

This device accepts one video input up to 8K@60 (7680 x 4320 pixels, 60 frames per second) and divides that signal into four quarters. If the input is an 8K signal, then each quarter is a 4K signal (3840 x 2160). These four quarters can then be scaled if needed, and each is output via its own HDMI 2.0 port.

The device appears to the Mac to be a single 8K monitor. Q lab has the ability to divide its output signal in quarters in a way that matches the way that this device divides it output signal in quarters. In this way, even though the Mac thinks it's a single big monitor, both QLab and the device understand that what you’re really doing is using four smaller displays.

I think the reason Alec says you need a Mac Studio to drive it is because only the Mac Studio is advertised as having HDMI 2.1 support, although it seems that the 2023 MacBook Pro, 2023 Mac Mini, and 2023 Mac Pro also support 8K output on their built-in HDMI ports.

Cheers,

Sam

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Sam Kusnetz (he/him) | Figure 53

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