Originally Posted by pkinneb
So due to room length limitations I was advised early in the process that two rows of recliners in my space would not work well. As you suggest for those holidays when the entire family is there I did want 8 seats so I decided to go with commercial theater seats for the rear row. My current thought is I will also use a CIH screen. My question to you is how tall would you make the riser? If I understand you correctly you are suggesting the normal 12ish inch tall riser and the upright nature of the seat will help position the rear row at the right height for the CIH screen is that correct? I am getting ready to build the riser and have been kicking around how tall it should be.
CIH with a scope screen is able to be done with the conventional dual row of fully reclining seating as many have done it on these forums. The angles may or may not have been perfect but everyone would get a full view of the entire screen.
Some things are changing over the last few years though. First is with 4k people are finally able to watch as immersive as they desire and many people are going more immersive. Secondly IMAX is making some inroads into HT media as they have been with the movies that switch AR like Dunkirk and Aquaman to name a couple and there is now a push by the studios and IMAX called IMAX Enhanced, where IMAX will be re-mastering movies that were originally shown in both scope and IMAX1.89 venues. The process is called IMAX DMR. Up to now a movie like Sully could only be bought for home as scope, and hopefully in the near future the 1.89 version or in some cases a 16:9 version re-mastered to better than before will be coming to UHD BD or even streaming media. To watch these movies at home you need a CIH+IMAX screen and you need IMAX immersion and if you have a second row it would be nice if they could see the full screen as the bottom will likely be lower.
As to the immersion factor between rows at home, for an example say you like to watch scope and flat movies as CIH and your seating distance is 2.0 times the screen height your IMAX distance would be 1.5 X SH and seem correct. Now if you take say the average HT with a 120” screen and you do the math (I won’t here.) if your front row is where you like it and you go with a long conventional riser and a full recline second row, the front row immersion is like sitting in the front 1/3 of a commercial theater and the second row is as immersive as being in the back row of the same theater. With an upright second row moving the eyes up just a few feet changes the immersion quite a bit and now maybe the second row is more like the middle of the theater. Plus of course you get a better angle if you decide to go with CIH+IMAX or one of the other variable presentation methods.
As to directly answer your riser height question I would suggest you make a scale drawing of the side view of your room. Put in the front seating you are thinking about and figure those heads and eye heights. Then find the upright seats you want to use and how much knee room you would like. Some people want it like a commercial theater where it is a little hard to get up and leave in the middle of the show and some like a little more room to get in and out. Keep in mind the front seats may or may not be reclined. Take a look at what this does to immersion in both rows. The height will be what it has to be. Divide that height to some distance that gives you some number of even steps 2-3 around 6”-8”. For comfortable steps rise + run should be around 18”. So a 6” rise should have a 12” tread or run. And 8” rise a 10” run.
Doing the side view with knowing the screen size and AR and ceiling height and your personal taste for immersion will answer all your questions. If you don’t know your desired immersion or are new to HT I suggest putting the projector on a low table and watching movies shown on a white painted wall for a few weeks to even a month and playing around with screen sizes and AR’s. Set up a 3.1 sound system temporarily and sit in lawn chairs that are easy to move around. Watch all your favorites and include a few IMAX AR changers and see if you like IMAX immersion. The reason I suggest a month or more of testing is most people as they start watching more than once a week like going out to a movie begin to slowly like higher visual immersion.
Sorry for the long post in answering your question.
One last thought. I have went past CIH+IMAX and went to an even more variable form of presentation. I don’t want to derail this thread so if you PM me I will link you to some threads about that.
PS I just tried your build link in your signature and it sends me to the wrong thread. I found it though.