I'm going with a 110 screen and my room is 19 foot deep. I'm going with the JVC RS1 and the throw distance for that size screen is a minimum of 11.9 feet and a maximum of 21.98 feet.
I have space behind my back wall where I can put the projector and thus not see it or hear it however it will be close to the max throw distance. Is there any drawbacks to doing this. My rack for my components will be in the wall less than 10 feet away which will save me dollars in terms of cord lengths.
I will run a conduit regardless to future proof. My room will be completely light controlled and I figure this will eliminate me of having to buy a mount but I'm not sure if the picture will be as good if the projector was mounted closer or any other drawbacks.
This forum has been a very good educationally as well as it's members being very willing to give a helping hand. :)
Much appreciated and thank you
Steve
jikkjack
01-26-07, 08:56 AM
Steve,
Run the number again with this calculator. It will tell you if your plan for the projector is sound. The calculator itself takes a percentage of the projector lumens to account for bulb dimming as it ages.Projector Calculator (http://www.projectorcentral.com/projection-calculator-pro.cfm)
I'm going with a 110 screen and my room is 19 foot deep. I'm going with the JVC RS1 and the throw distance for that size screen is a minimum of 11.9 feet and a maximum of 21.98 feet.
I have space behind my back wall where I can put the projector and thus not see it or hear it however it will be close to the max throw distance. Is there any drawbacks to doing this. My rack for my components will be in the wall less than 10 feet away which will save me dollars in terms of cord lengths.
I will run a conduit regardless to future proof. My room will be completely light controlled and I figure this will eliminate me of having to buy a mount but I'm not sure if the picture will be as good if the projector was mounted closer or any other drawbacks.
This forum has been a very good educationally as well as it's members being very willing to give a helping hand. :)
Much appreciated and thank you
Steve
Most digital projectors do not have a constant-aperture lens, meaning that light output will vary depending upon throw distance (due to the variances in zoom). Having said that, the difference varies from projector to projector. The only way to know for sure is to see measurements.
Also, as was alluded to in the previous post, any bulb based projector will lose 30% or so of its light output within the first couple of hundred hours.
I checked on Projector Centrals website and they don't have the JVC RS1U listed :confused: yet so I'm not sure where to go from here.
Are you saying that the longer the throw distance the lower the lumens or the further the projector is from the screen the dimmer the picture?
Steve
I checked on Projector Centrals website and they don't have the JVC RS1U listed :confused: yet so I'm not sure where to go from here.
If you were planning to use a calculator to account for bulb dimming, my recommendation is to count on your bulb spending most of its useful life with 30% to 50% fewer lumens than its "new bulb" measurement. Check out the Cine4Home.com review for new bulb measurements.
I checked the Cine4Home review, and unfortunately they do not have brightness measurements posted for the RS1 at various throws. You might want to post this in the High End Digital Projector forum to see if you get a more definitive answer.
My personal feeling is that on a 110 inch screen the RS1 will be bright enough at any throw, so I doubt it's something you have to worry about.
On my Sony Pearl, max throw decreases brightness by 17% but increases contrast by 53% (assuming AutoIris1)-- I would take the contrast over the brightness any day of the week. I do not know if a similar trade-off is available with the RS1.
Are you saying that the longer the throw distance the lower the lumens or the further the projector is from the screen the dimmer the picture?
Steve
How are these two things different? If I understand you correctly, these two statements are the same thing, and both are typically true of projectors with a non-constant aperture lens.