# Room Mode/Screen Size

Discussion in 'Beginners, General Questions' started by Articfox918, Dec 1, 2017.

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Last edited: Dec 1, 2017

### Articfox918 Auditioning

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I'm very new to the whole HT scene but I have been frantically researching as I get ready to build. A little background before I ask my question. I will be working with a completely blank slate in the basement so I have nearly every option under the sun available to me. I have a rough idea of my room which will be 24' X 14' X 8.5' I refuse to start building until I have a firm grasp on what I am going to do. I have been researching like mad and I know Screen size is not based off of what space you have but rather where you are siting. During my research I stumbled across a Room Mode calculator by Harman. I entered my room data and here is what the tool spit back at me.

So my question is can someone shed a bit more light on this for me. If I am reading and doing it right I should have my seating at about 12' which would be dead center of the room, correct? I plan on having 2 rows of 4 seats with a bar behind the back row of seats. If my above statement is correct do I split the difference between seat locations? Does it matter? Or do I only worry about where the person using the theater all the time(ME) will be sitting most of the time?

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2. ### Stephen_J_H All Things Film Junkie

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This seems to only be acoustic calculations, which are definitely a consideration, but there are other questions that are more pertinent to the home theatre elements.
1. Screen size--if your front wall is 14' wide by 8.5' high, how big of screen are you wanting to install?
2. Viewing distance--this will do more in terms of speaker placement than the room mode calculations above, as you will want your surround speakers [for 5.1 surround] to be just behind your ears and slightly above them. If you have back speakers [7.1 surround], you'll want sufficient distance from the back wall to your seating area for the effect to be heard. If you go to the next level, which is "object-based" audio, you'll want to factor in the positioning of any ceiling mounted speakers
3. HD or 4K display? Are you going projection or flat panel? A flat panel will automatically reduce your distance to screen; as well, to appreciate 4K, your optimum distance from the seating area will actually be closer to increase perception of detail. With a 4K projector, your front wall will easily support a 12-15' diagonal screen if you have a projector with the necessary lumens to produce such an image. The recommended viewing distance for 4K is 1-1.5 screen widths, which with a 12' diagonal screen would be anywhere from 10-15 feet. For 1080p, your ideal viewing distance is anywhere from 15-25 feet, putting your sweet spot at between 12-15 feet for a 12' screen.
Just some starter thoughts....

3. ### bigshot Cinematographer

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Figure that you want to avoid reflection points. Think of your room as a pool table with sound bouncing off the walls. A listening position in the middle of the room puts your listening position right at the primary reflection point of the wall. Not good. Split the difference 2/3s back from the speakers.

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