mounting new plasma

[mike c]

i want to mount my plasma higher than "normal" (eyeball middle of plasma)

how high can i mount a plasma without hurting my neck?

the plasma dimensions 52" wide x 32.8" high (54" diagonal)
http://service.us.panasonic.com/OPERMANPDF/TCP42G25.PDF

front wall to eyeball is around 154".

i'd like to clear AT LEAST 40" from the floor to the bottom of the plasma, if i can mount in higher, the better. (only if possible of course)

help!

and of course, a link to a distance vs angle of viewing would also help

TIA!

 

[mike c]

additional info:

i have this mount (tilting)
http://www.monoprice.com/products/product.asp?c_id=108&cp_id=10828&cs_id=1082806&p_id=3724&seq=1&format=2

Vertical Angle of View & Screen Height:

For optimum viewing, the eyes of the viewer should be level with the center of the screen.

Maximum vertical angle of view: In those home theater set-ups where this is not possible, the SMPTE guidelines suggest that the maximum vertical angle measured at the seated eye height from the front row center seat to the top most part of the projected image should not exceed 35 degrees.

This does not represent the optimum viewing angle but rather the limit beyond which the viewer will be subject to an increased neck strain.

This maximum vertical angle limit is always measured from the front row as this represent the extreme angle of view.

Minimum angle of vision: While there do not appear to be any specific SMPTE or THX guidelines in this respect, yet studies have shown that if the screen size occupies less than 15 degrees of the viewer's vertical field of view, than that image appears small.

quote from this page

http://ezinearticles.com/?TV-Viewing-Distance-and-Screen-Placement-in-the-Home-Theater&id=37449

anybody want to do the math?

http://myhometheater.homestead.com/Verticalviewing.html

 

[jostenmeat]

Um, I think this is potentially a lot of number crunching.

You forgot a really big piece of information: height of your eyes. I believe that typically, with HT seating, your eyes are about 36" high, +/- couple inches depending on body type and amount of reclining.

Anyways, without the above, you can't run any math on vertical viewing angle above the eyes' plane.

A less important detail is the height of the ceiling (after all you did say high as possible).

Lastly, I think there should be caveat(s) with the "center of screen". For a small screen, or from great distance, sure I can see that. But I believe with large PJ screens, it's more like 1/6 to 1/3 from bottom of screen in relation to eyes' height. After all, outstretched legs and feet might get in the way, depending on how much one likes to recline.

 

[mike c]

right. i forgot about the height, i assumed all chairs were of the same height which made the eyeballs 42" high

 

[jostenmeat]

right. i forgot about the height, i assumed all chairs were of the same height which made the eyeballs 42" high

I personally used 37" for all of my recent measurements. I got front row to be smack dab in the middle between 1/6 and 1/3, and the rear rows's eyes to be just over the centerline.

I think 42" is closer to the top of the head. If you look at the AVS riser height calculator, you'll see that 42" is the starting default.

http://www.theater-calc.com/

 

[mike c]

just measured actual height of eyeball ... 41"

there's only going to be one row. i'll try to draw the layout on google sketch, but i suck at degrees and angles

found the formula: sinA=a/h

problem is, i don't know how to use sin on the calculator ... still re-learning

 

[mike c]

finally got it:
40" height will give me 11.67 degrees
50" height will give me 15.19 degrees

height = floor to bottom of panel

that's how the formula computes ... but does that mean i actually need to mount it higher to meet the 15 degree thingy?

i'll try to shoot within 40-50".

am i alright with that range of height?

 

[sawzalot]

I have my Pio mounted slightly higher then eyeball to center, it is eyeball to approx 5 inches up from the bottom of the bezel, panel is exactly 35 inches to the bottom and 50 inches to the center ( from the floor ) eyeball height is 39 to 40 inches at seating as this furniture is higher than the norm. Well all that said I and Family never have any issues with neck strain everyone actually agrees that it is very comfotable, now if I can just get some recliners I would be all set .

 

[highfigh]

I have my Pio mounted slightly higher then eyeball to center, it is eyeball to approx 5 inches up from the bottom of the bezel, panel is exactly 35 inches to the bottom and 50 inches to the center ( from the floor ) eyeball height is 39 to 40 inches at seating as this furniture is higher than the norm. Well all that said I and Family never have any issues with neck strain everyone actually agrees that it is very comfotable, now if I can just get some recliners I would be all set .

The usual recommendation is to have the center of the screen no more than ±15° from level.

 

[sawzalot]

The usual recommendation is to have the center of the screen no more than ±15° from level.

If my math is correct I am at 18.6666666 degrees so I guess I lucked out

 

[highfigh]

just measured actual height of eyeball ... 41"

there's only going to be one row. i'll try to draw the layout on google sketch, but i suck at degrees and angles

found the formula: sinA=a/h

problem is, i don't know how to use sin on the calculator ... still re-learning

sin is opposite/hypotenuse. Use this table for tangent (rise/run, or opposite/adjacent) and multiply the distance to the screen by the number that coincides with 15° and tangent.

http://www.industrialpress.com/ext/StaticPages/Handbook/TrigPages/mh_trig.asp

 

[highfigh]

i want to mount my plasma higher than "normal" (eyeball middle of plasma)

how high can i mount a plasma without hurting my neck?

the plasma dimensions 52" wide x 32.8" high (54" diagonal)
http://service.us.panasonic.com/OPERMANPDF/TCP42G25.PDF

front wall to eyeball is around 154".

i'd like to clear AT LEAST 40" from the floor to the bottom of the plasma, if i can mount in higher, the better. (only if possible of course)

help!

and of course, a link to a distance vs angle of viewing would also help

TIA!

This can't be determined without the distance from the viewer to the screen or from eye level to the center of the screen (hypotenuse). Once that has been stated, the height from the floor to the viewer's eyes is the zero point for your sin/cos/tan calculation. At 12', the center of the screen would be about 37.5" above eye level.

 

[jostenmeat]

This can't be determined without the distance from the viewer to the screen or from eye level to the center of the screen (hypotenuse). Once that has been stated, the height from the floor to the viewer's eyes is the zero point for your sin/cos/tan calculation. At 12', the center of the screen would be about 37.5" above eye level.

You could take that 154" figure given, and subtract a few inches I suppose. Perhaps 150" as a ballpark.

mike, I will run a bit of math for you in the next hour or two, but in the meanwhile, I gotta ask, why high as possible? I think of things like:

- keeping it away from child's reach for as long as possible (another year or two or something)
- installing a larger beer fridge underneath it, while still allowing a center speaker
- You like to watch TV when using an exercise device like the below

 

[jostenmeat]

finally got it:
40" height will give me 11.67 degrees
50" height will give me 15.19 degrees

height = floor to bottom of panel

that's how the formula computes ... but does that mean i actually need to mount it higher to meet the 15 degree thingy?

i'll try to shoot within 40-50".

am i alright with that range of height?

Oh I guess you already figured it out. No, you don't need to mount it higher. I am close to 16 from front, less than 9 at rear, and they are both quite enjoyable.

I suppose you can make a cutout, even put a picture on it, and hang it at the various spots to see what it might look like.

I wouldn't sweat it too much if you are close to the +/- 15 deg. I suppose it's personal preference at some point.

 

[highfigh]

You could take that 154" figure given, and subtract a few inches I suppose. Perhaps 150" as a ballpark.

mike, I will run a bit of math for you in the next hour or two, but in the meanwhile, I gotta ask, why high as possible? I think of things like:

- keeping it away from child's reach for as long as possible (another year or two or something)
- installing a larger beer fridge underneath it, while still allowing a center speaker
- You like to watch TV when using an exercise device like the below

I didn't see the 154" distance ( I must have had one of my spells) but why would we need to round it down when the number is multiplied by the quotient from the chart? 154(.267949)= 41.26", which is the maximum height of the screen's center above eye level if 15° is the target.

Mike- you're safe at 40"-50", if that works for your neck. At that distance, it should be fine.

 

[mike c]

sorry i used sin inv A = a/ hypotenuse (had to learn using windows calculator, since i didnt have a scientific calc with me - only my laptop)

why as high as possible? i'd like to put stuff at the bottom of the display like subs and stuff

if i do 40", center would have to go on top of the display.
(center is 7" by the way)
if i do 50", center would either still be on top or below the display

 

[jostenmeat]

I didn't see the 154" distance ( I must have had one of my spells) but why would we need to round it down when the number is multiplied by the quotient from the chart? 154(.267949)= 41.26", which is the maximum height of the screen's center above eye level if 15° is the target.

1) I presumed he was not going to flush mount the display on the wall
2) I was too lazy to look up the depth of the 54G25
3) I was too lazy to look up the depth of the Monoprice mount
4) I thought 150 looked like a very welcoming and easy number for mike, instead of something that looked like 154*0.267949; I didn't want to scare him.

But now that you've asked, well I have barely the motivation to look em up, so I will. 54G25 3.5" depth (according to Vann's), and Monoprice has a minimum extension of 5" (really ??).

Well, so I guess that makes it 154 - 3.5 - 5 = 145.5. Right, or am I missing something?

So, 145.5 x 0.267949 = 38.9865795. I feel completely comfortable making that into 39.

highfigh, I know you're the enginerd, and I suck at math, so feel free to confirm. BTW I'm using 39.0!

40" height from floor to bottom of display (where the pic starts, not the bezel), equals 12.33 degrees.

50" height instead means 16.03 degrees.

Yep, I agree that anywhere between 40-50 will be just fine.


EDIT: crap, now I realize that the 32.8 height is the whole display most likely, and not the plasma cells. Grrrr.

OK, so true display height is 26.45. Here we go again.

40" from floor to bottom plasma pixels: 9.92 degrees.

50": 13.69 degrees.

I did the last two more quickly, so . . .

 

[mike c]

1) I presumed he was not going to flush mount the display on the wall
2) I was too lazy to look up the depth of the 54G25
3) I was too lazy to look up the depth of the Monoprice mount
4) I thought 150 looked like a very welcoming and easy number for mike, instead of something that looked like 154*0.267949; I didn't want to scare him.

But now that you've asked, well I have barely the motivation to look em up, so I will. 54G25 3.5" depth (according to Vann's), and Monoprice has a minimum extension of 5" (really ??).

Well, so I guess that makes it 154 - 3.5 - 5 = 145.5. Right, or am I missing something?

So, 145.5 x 0.267949 = 38.9865795. I feel completely comfortable making that into 39.

highfigh, I know you're the enginerd, and I suck at math, so feel free to confirm. BTW I'm using 39.0!

40" height from floor to bottom of display (where the pic starts, not the bezel), equals 12.33 degrees.

50" height instead means 16.03 degrees.

Yep, I agree that anywhere between 40-50 will be just fine.


EDIT: crap, now I realize that the 32.8 height is the whole display most likely, and not the plasma cells. Grrrr.

OK, so true display height is 26.45. Here we go again.

40" from floor to bottom plasma pixels: 9.92 degrees.

50": 13.69 degrees.

I did the last two more quickly, so . . .

thanks jostenmeat.

yes on all your 1-4) numbers. i will be surface mounting this on concrete.

wish me luck, 35mins until i start drilling holes in the wall (I get off work in 30)

 

[jostenmeat]

You're welcome mike. I hope it's all working out smoothly enough!

 

[mike c]

got it installed. i can't see this as anything BUT a two person job!

me and two minions took 3 hours to do this. i was so tired, i couldn't see that the reason i couldn't get any picture was i had plugged into HDMI input 2 instead of 1 on the receiver (burned through an extra hour blaming the PS3 or cables for no picture)