What is projector?

In plain language

A television sits beside its sources. A projector sits across the room or on a ceiling, which means a long HDMI run, usually an AV receiver in the middle, and often a screen-masking or lens-memory routine that adds delay before it is ready.

Why it matters in your setup

Three things follow from that. The cable is doing real work, so bandwidth failures are common and look like device faults. The receiver sits between source and projector, so it decides what capability data the source sees. And the projector's slow wake-up means the source may decide nothing is connected during the gap.

Projectors also rarely support native Dolby Vision, which is why LLDV comes up so often here: let the source do the tone mapping and hand the projector a finished picture.

What the DR HDMI 8K does with it

The DR HDMI 8K addresses all three. A fixed EDID stops the source renegotiating when the projector wakes; TX +5V force can keep it out of the negotiation entirely; capping the advertised FRL rate isolates a marginal long cable; and the Dolby Vision data block builder is where LLDV is set up for a projector that has no native DV.