What TV size fits a 2.5-meter seat? The 30 to 40 degree range

The two ends of the band are horizontal angles: 40 degrees for the THX target and 30 degrees for the figure widely quoted as SMPTE's. The 30 is an older reference, not a current rule, so it works as a geometry marker. Both depend on how wide the picture is, not on the brand or the panel type.

From 2.5 meters, 61-inch TVs fill 30 degrees and 82-inch TVs fill 40. The retail TVs inside that band run from the 65-inch TV to the 77-inch TV. A 55-inch TV falls short of it at 27 degrees.

Measure from the front of the screen to your eyes in the spot where you'll sit. From 2.5 meters, the 65-inch TV fills 32.1 degrees and the 77-inch TV fills 37.6. A 75-inch TV fills 36.7 degrees, which is inside the band too.

An 85-inch TV goes past the 40 degree target at 41 degrees, so it's a big step up for this seat. A half meter either way moves the band, as the 2 m and 3 m pages show.