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Please Note : This forum is for projectors that use a screen and not rear projection HDTVs. There is a separate forum for RP HDTVs.

first projection project

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Old 03-18-2015, 10:32 PM   #16
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Guys
Thanks for the great and sage input. My project this weekend is to paint the ceiling to match the walls (deep yellow) and cover the white of the current ceiling. I've been into the ceiling crawl space to determine the electrical runs and adding reinforcement to the drywall between the joists to support the screen and projector.

Luckily, the sound system is already in place-my 7.1 surround w an Onkyo 805 driving AR9's as L&R w four 12" woofers+ two 8" mid woofers adding to the two 12" Polk powered subs on the LFE channel. The SPL can be extreme w/o distortion.

I will definitely check into the tab tensioned screens.
dave

Last edited by DaveJ; 03-18-2015 at 10:34 PM.. Reason: spelling
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Old 04-05-2015, 07:43 PM   #17
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Well, I have not found the time to paint the ceiling but have installed the screen and that's a start. I followed the recommendations on this forum and went with the Panny AE8000 for $1.5K. I selected a "Elite Screens Spectrum Tab-Tension Series, Tensioned Electric Drop Down Projection Screen, 125-inch Diag. 16:9, Model" . The throw distance is a touch over 13'.

One of my concerns was the HDMI switching. My AVR (Onkyo 805) has only one HDMI output which necessitated getting a HDMI switch. I found one that seems to actually work (E-More® Mini 2 x 2 HDMI Switch Splitter With 2 in 2 out Supporting HDMI1.4a 3D) at Amazon for $30. I have all the input devices (Blu-Ray player, Roku, S-VHS, LaserDisc) running thru the AVR and into the HDMI switch's #2 input except the cable box. I run the cable box (Xfinity X1) into the HDMI switch's #1 input. This way I can view the news, sitcom, etc on the Sammy HDTV w/o using the surround sound when the projection screen is retracted. When I am watching anything where I want surround sound (streaming, music programs, movies, etc) I have an optical digital cable between the AVR and the cable box.

So far, so good. Here are some pics. I'll post more as I get further along. My wife felt we needed to change the room decor which, of course, used a chunk of the budget and has slowed down the project.
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Old 04-05-2015, 08:51 PM   #18
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Very nice - glad things are working out for you
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Old 05-24-2015, 01:22 PM   #19
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A couple of pics of the projector mounted; the screen retracted and then deployed in viewing position. In the retracted position, we can view the 61" Sammy and have a more typical media room for watching TV. With the screen down and projector fired up and the volume at reference levels, the room is elevated to another level of total immersion in sights and sounds.

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Old 06-13-2015, 10:10 AM   #20
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Default Possible Keystone Use?

First of all, nice job!

Perhaps a helpful tweak...

It appears from the picture of the PJ is that the PJ is tilted down somewhat? If this is so, how much "keystone adjustment" have you employed?

If the keystone adjustment is necessary to offset the short drop pole on your mount which then does not allow for a "lens perpendicular" to the screen scenario, you may wish to lengthen the drop pole.

Using keystone, as it says in the manual, actually reduces the image quality somewhat by not having the PJ use all of the pixels available. Depending on the amount of keystone used, more being less pixels, not using the keystone at all is generally preferred. It may not be a dramatic improvement and the photo you posted may just look to me like the PJ is tilted about 15 degrees. If it is not tilted and the lens is perpendicular to the screen... All is well!

Just wanted again to say your setup and the work you have invested in it, is substantial. If you have any keystone in play, removing it with a longer drop pole will reward you with clearer images.

Good viewing,

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Old 07-01-2015, 03:31 PM   #21
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Default Keystone correction

hey Doug, thanks for looking and commenting. Yes, the Panny is tilted and I am employing some keystone correction. A longer pole would definitely reduce or eliminate the Keystone correction BUT it would greatly increase the WIF (wife irritation factor) so I went with the lessor of two evils.
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Old 07-02-2015, 06:34 PM   #22
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Doesn't your PJ have lens shift so you can keep the lens axis perpendicular to the screen and eliminate the need for keystone?
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Old 07-09-2015, 01:24 PM   #23
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yes, the Panny has lens shift H&V. I have not played with that aspect of the pj as I was using the remote and the lens shift joy stick is on the front of the pj and I will have to get up off the couch and reach up to adjust it. The focus, keystone and zoom can all be done sitting on the couch. I will get my sorry butt up and try the lens shift control.
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Old 07-09-2015, 01:36 PM   #24
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Quote:
Originally Posted by DaveJ View Post
yes, the Panny has lens shift H&V. I have not played with that aspect of the pj as I was using the remote and the lens shift joy stick is on the front of the pj and I will have to get up off the couch and reach up to adjust it. The focus, keystone and zoom can all be done sitting on the couch. I will get my sorry butt up and try the lens shift control.
thanks
dave
Yeah lens-shift is infinitely preferable to keystone correction, that is what I use on my penny projector to make it align properly
Edit: what you'll want to do is make the proj perpendicular (no slant) then move the screen w/ lens shift.

BTW - aren't you glad you did it - isn't it fantastic and also are you happy with the proj recommendation.

Also the Onkyo 805 is a great receiver - probably one of the all-time bang for the AVR's when released it was so much better priced than all others. At the time when It cam out in '08 IIRC (poss '07) I was doing my HT and HDMI switches and splitters wer crap so even though I wanted an 805 the only two AVR with 2 HDMI out at that time were the 875 and 905 The 875 was a poor valur choice and I ended up with a TX-NR905 and used it until this spring when I replaced it finally with a Pioneer Elite that also has 2 HDMI out although switches , splitters and ultiplexers now make it so much easier

Last edited by jkkyler; 07-09-2015 at 06:18 PM..
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Old 07-29-2015, 02:22 PM   #25
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Default keystone vs lens shift

I have realigned the Panny pj as jkkyler and 73shark suggested. My pj is now parallel to the floor and perpendicular to the screen. I reset the keystone to zero and used lens shift to align the picture on the screen. I understand that in theory, the use of the keystone correction produces inferior PQ, but in practice (it is only in my application of which I speak), I could not detect a discernible difference. I confess I did not do any AB comparisons or double blind studies to support this. But, as always, YRMV

I am still being blown away by the PQ and by being totally immersed in the viewing experience. When any of my buddies come over and I demonstrate the HT, they want to move in right then and there. Even the gals.

If you have not ventured into the world of projection HT, I suggest you investigate this mode of video presentation. I am constantly amazed and dazzled every time I fire it up My only regret was not getting involved with projection HT sooner
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