Riser Height Calculator - Page 3 - AVS Forum
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post #61 of 165 Old 04-08-2006, 07:21 PM
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Just used this tool, I'm about to build my riser and was looking for the best hight. This made it simple.

Best part is tring different numbers......move the screen up and down a few inches and see the results.

Thanks for the work everyone.
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post #62 of 165 Old 04-25-2006, 11:12 AM
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This is a great tool but I'm unclear as to what the ideal height of the screen should be. Early on in this thread someone tossed out a number but is their an accepted percent of the screen that should fall below the eye level of someone sitting in the front row? Is there a similar tool for a screen height calculator available?
Thanks for your input.
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post #63 of 165 Old 04-25-2006, 11:44 AM
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David,

A good rule of thumb is that you eyeballs should be a 1/3 of the way up from the bottom of the screen. This is just a guide based on a comfortable angle to view a movie. Some people may like the screen a little higher and lean their seat back, but most people don't want the movie fully reclined.

I used the 1/3 rule, but in need to move my screen up another two inches some my riser would not have to be 16" tall.

J-dubb
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post #64 of 165 Old 04-25-2006, 08:29 PM
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J-Dubb
That was just the straight forward answer I was hoping to get. I think I will be using the Ekornes stressless chairs in the front row so I'll go check them out tomorrow with the 1/3 rule in mind. I just ran the riser calculator and discovered that my riser will have to be about 14 inches. That seems a little high given my ceiling is just a little over 8 feet. Maybe I'll grab those same couple of inches back on screen height to get the riser down to 10-12 inches. Thanks again.
David
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post #65 of 165 Old 04-27-2006, 06:56 AM
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Great calculator! How would you use this if you had 2 risers + floor level? Just do the floor and first riser and then use the numbers of the first riser to calculate the second riser?

The Log Cabin Theater Build

A.D.D. stands for attention deficit LET'S GO RIDE BIKES!
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post #66 of 165 Old 05-28-2006, 08:28 PM
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Any chance that the calc page be ammended to suit metric users.

Feet and inches mean next to nothing to me as I work in SI units

Mick

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post #67 of 165 Old 05-28-2006, 08:44 PM
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Wouldn't the math be the same if you pretended that Inches = centimeters or any other units?
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post #68 of 165 Old 06-01-2006, 05:21 PM
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As much as I would like to advocate the US switch to metric, I have better things to do with my time right now. I would suggest getting a calculator that does the conversion for you (I use one on about a daily basis)

X: http://sourceforge.net/projects/x48
OSX: http://www.hpcalc.org/details.php?id=5829
WIN: http://www.hpcalc.org/details.php?id=3644

BTW
1ft = 12in
1in = 2.54cm
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post #69 of 165 Old 07-18-2006, 12:56 AM
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Is it just me or is the link not working anymore to get to the calculator?
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post #70 of 165 Old 07-18-2006, 09:07 AM
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Works for me!
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post #71 of 165 Old 07-18-2006, 09:49 AM
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would guys close, seal your riser or leave it open (in both cases of course carpeted) ?
and leave it empty or fill it with foam or glass whool ?

thanks
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post #72 of 165 Old 07-18-2006, 09:27 PM
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ok I got it working now....must have been on my end...hmmmmmm
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post #73 of 165 Old 07-19-2006, 05:28 PM
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Quote:
Originally Posted by rsberg34 View Post

ok I got it working now....must have been on my end...hmmmmmm


Maybe not on your end. My DSL service has been terrible for the last month or two, and the Qwest technical support half-a-world-away is less than helpful.
If you are having problems I would suggest trying later. I will keep after qwest for a fix.
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post #74 of 165 Old 07-21-2006, 12:19 PM
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This is really good! Thanks!

But how about a calculator for the third row ?

-Rajiv

PS: I did do a search for 'third' but nothing came up.

-Rajiv
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post #75 of 165 Old 07-21-2006, 12:23 PM
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Quote:
Originally Posted by David R View Post

This is a great tool but I'm unclear as to what the ideal height of the screen should be. Early on in this thread someone tossed out a number but is their an accepted percent of the screen that should fall below the eye level of someone sitting in the front row? Is there a similar tool for a screen height calculator available?
Thanks for your input.


David,
Check this site for the ideal height of the screen and viewing angle (also has THX recommendations)

http://www.myhometheater.homestead.c...alculator.html

-Rajiv

-Rajiv
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post #76 of 165 Old 07-31-2006, 04:25 PM
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It's nice to know when you've spent time making something, that it's actually getting used. I was just noticing how much traffic the riser script gets, so I made a quick report. I was so suprised I thought I would post the results.

The log started from when I last rebuilt my server (Aug. 19, '05 -- so ~1 year of traffic).
riser.cgi
Total Page Views: 18157
Unique Visitors: 6964

Thanks!
-Jake
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post #77 of 165 Old 08-08-2006, 02:48 PM
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Thanks for the calculator, but what about the calc for a third row.

The new home we're thinking about will have the HT on the main floor, it will be 15x25x12. The first and second rows will each have 4 090 Berks while the 3rd row will have 2 090 Berks.

Is it right to assume the 2nd riser height should be the same as the 1st riser.

Thanks

Jim Sentry
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post #78 of 165 Old 08-08-2006, 04:15 PM
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Quote:
Originally Posted by pixie View Post

Thanks for the calculator, but what about the calc for a third row.

The new home we're thinking about will have the HT on the main floor, it will be 15x25x12. The first and second rows will each have 4 090 Berks while the 3rd row will have 2 090 Berks.

Is it right to assume the 2nd riser height should be the same as the 1st riser.

Thanks

You should be able to use the same riser height/depth for additional rows.

If the third row will have different seats/measurements than the second, just use the calculator treating your second row as the first row, and your third row as the second row.
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post #79 of 165 Old 08-15-2006, 07:45 AM
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Hey guys just did my calculations and hit dead on 6". Great tool!

My question has to do with the fact that I will be having my subs sitting (depending on how wide I build my riser) either right beside or on top of the riser.... For bass considerations, should I close the riser off (a box) or keep it open?

My room tends to be a little bassy anyway, but not sure if the riser will create a bass trap and deaden it or elevate the perceived bass.

Any help would be greatly appreciated!

Thanks,

Steve
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post #80 of 165 Old 09-17-2006, 06:18 AM
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good job.
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post #81 of 165 Old 09-17-2006, 06:19 AM
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how do you make a riser with 2 levels?
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post #82 of 165 Old 10-14-2006, 10:41 AM
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Anyone use a riser as a subwoofer?

Joe
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post #83 of 165 Old 01-14-2007, 04:20 PM
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Nobody told me there was gonna be math,

First I marked the wall where the screen was going to go. Next I lined up two tall recliners (the back at about the size of an average adult) one behind the other facing the screen. Finally I laid an old bookcase on its front and put one of the recliners on it. I sat in the rear seat. I could see the bottom of the screen mark. 9"is the height I will build my riser.
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post #84 of 165 Old 01-15-2007, 10:58 AM
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Can anyone tell me a good height to put my screen at? I will have three rows of seat the first one being 10.5 from the screen and there are two 12" risers to the third row.

Any ideas. I have been playing with 2 to three feet from the first row floor
Thanks
Chris
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post #85 of 165 Old 03-04-2007, 06:54 PM
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Ok, I must be real dumb. I had someone install a screen for me that appears to be reasonably high enough. I plugged some numbers into the calculator and got this:

Floor to screen bottom: 32.25"
Height of 1st row: 41"
Height of 2nd row: 41" (both rows have the same type of chairs)
Screen to 1st: 13'
Screen to 2nd: 19'

then it gives me:
Minimum ri9ser height: 4"

Is that correct? I need to make a riser that is only 4" high? Is it just me, or does that sound ridiculous?

What am I not getting?
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post #86 of 165 Old 03-04-2007, 07:34 PM - Thread Starter
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The measurement for the front row is the height of the top of the viewers head. The measurement for the second row is the height of the viewers eyes. If both rows have the same seats, the second row measurement should be somewhere around 5" less than the front row measurement. If 41" is the top of head measurement, you'll probably end up needing about a 9" riser.

Rob
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post #87 of 165 Old 03-05-2007, 06:48 AM
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Thanks. I missed that nuance.

What's the rule of thumb for a step? At what point is a step "too high" (i.e. you need an intermediary step before it). When I measure the steps in my house, it looks like they are between 6"-7" high.

Thanks.
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post #88 of 165 Old 03-05-2007, 01:14 PM - Thread Starter
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I don't think there is a hard and fast rule. My home steps are 8" high. My riser ended up being about 18", and my 9" steps seem fine. There's no reason you couldn't do a 4 1/2" step if you wanted to. Whatever feels right to you.

Rob
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post #89 of 165 Old 06-29-2007, 05:36 AM
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Does the riser height calculation depend on the height of the person sitting on the chair?
My girlfriend is 4'10" tall. If I used her as the measurement would the riser need to be higher?
(Suppose she wanted to sit in the back row and have a clear view of the screen over someones head.) I'm having difficulty grasping the concept. If you use a tall person (lets say 6'5") then would you need a lower riser height?
Thanks.
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post #90 of 165 Old 06-29-2007, 10:03 AM - Thread Starter
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The calculator assumes the same height person in both rows, with the same type of chair. The defaults are very close to my own measurements, at 5'9". You can adjust these as you see fit. If shorter people will be consistently in the front row, the riser can be made lower. If they will be in the back row, the riser will have to be higher. For example, if your girlfriend likes to sit in the back, and you have a lot of tall friends who will be sitting in front of her, use her seated eye height for the rear row measurement, and their top of head height for the front row measurement. This will result in a much higher riser, but will guarantee her a clear line of sight. Switching their positions around will result in a lower riser.

Rob
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