1a) Where to Judge The Auditorium

There is no perfect answer for “Where should I be to judge the screen and sound system?” Actually, we don’t need to be in a “perfect” place. We just need a consistent place – measure from the same place every time. Still, where?

One Screen Height demo drawing One group of experts will say that you should judge from so many “Screen Heights” away. A screen height is just like it sounds, but very difficult to evaluate. In the movie theater, if a screen is 64 feet wide, then the height is 27 feet high. 64 feet is pretty big. If the screen is half that size, it will be 32 feet wide and 13½ feet high. If the screen is smaller, for example, a little bigger than 21 feet wide – which is 1/3rd of 64 feet – it will be 9 feet high.
After you figure how high the screen is – depending on which expert you listen to – you go back 2 screen heights to judge things. 64 feet wide? 54 feet back from the screen. 32 feet wide? 27 feet back. A 32 foot wide screen? 18 feet back. (Apologies to all those who use meters. Apologies to all those who hate math. Read: 10) What Does It Mean? Scope/Flat for more details.)

The problem is that sometimes the screen is wider or taller than other times. That’s because many screens have a movable black curtain on the sides, and the top and bottom. These curtains, called ‘masking’, change positions depending on how the movie is supposed to look. There are two many categories for movies, Flat and Scope.

Flat is more square, so the apparent screen height goes higher, and the sides come in to make the screen more narrow. It isn’t exactly square. The width is a little more than the height, but not by much. Scope is obviously more side than tall. In a general sense, Scope allows more scenery and space around the actors, and Flat keeps the actors at the center of the story.


Total Auditorium Length and thrids_total_auditorium_length_3rdsThere is another method that technicians use for the measurement point. The say ‘two-thirds back’. This means that they will divide the length of the auditorium by 3, then multiply by 2, and place their equipment there.

Imagine that the auditorium is 90 feet long, you divide by 3 to get 30 feet, then multiply by 2 to get 60 feet. Go to the center of that row and set up for your testing.

Ceiling Grid Measurement Technique
But who really knows the length of the auditoriums?

One way to figure out the length is to count the ceiling tiles of the auditorium. Count them, divide by 3 to get the 1/3rd amount, and count them again from the back wall until you reach the 1/3rd amount. Find the closest convenient row, walk to the middle, get comfortable.

In the example here, we look up and count – there are 12, almost 13, tiles from front to back. If we divide by 3 we get 4-plus a little. We go to the back, count forward 4 plus a little. Look down and choose the most convenient row to sit in. Walk to the center seat.

Oh, and where is the center seat? Look up to see the port window that the projector shines though. That will be the center of the screen. If the screen isn’t in the center of the room – for example, if there is an exit door on one side of the front wall – the center of the room for the sound system will be a couple of feet to one side of the port window. But it really won’t make a difference for these simple tests.

Here is the most important part: Have fun. Notice a little more each day. You represent the customer, you represent the movie makers, you represent the cinema owner’s responsibility to give the best presentation possible. Be proud of that.

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