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yonexsp
Joined: 25 Apr 2006
Posts: 311
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| Posted: Tue Dec 04, 2007 4:07 pm Post subject: Can you stack with 2 different projector types? |
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Is it possible to create a stack with an XGLC and a G70? How would that work out, or would it not work very well?
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Tue Dec 04, 2007 5:35 pm Post subject: |
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I don't see any reason why you couldn't as long as both machines have the (geometry) capibliities to be stacked
Try it and let us know how it works out.
Erik
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Fujifrontier
Joined: 20 Oct 2007
Posts: 354
Location: San Antonio, Texas
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| Posted: Tue Dec 04, 2007 7:48 pm Post subject: |
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what is the difference between stack and blend?
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Tue Dec 04, 2007 8:12 pm Post subject: |
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A stack completely overlays the images each projector produces. You get twice the brightness, but it costs you in terms of sharpness. Unless you use a newer very stable projector, convergence can also be a pain in the ass. A stack can be over/under or side-by-side, depending on room and configuration constraints, and how much geometry control the projectors have.
Blending is short for edge-blending. In that configuration (for HT at least), two projectors project two images on the screen side-by-side, where a portion of the image from each overlaps one another. Then, you use a processor to ramp the luminance down on one and up on the other to create a seamless blend between the two. You get the brightness of a stack on a large screen, but the sharpness of a single projector. You also typically use more phosphor. The con is that it either requires expensive hardware to do the blend (Analog Way Di-VentiX - AKA Blendzilla), or a kludgy HTPC/software-based solution, which generally limits source material to only HTPC-based sources.
Personally, I think it would be difficult enough getting two of the same machine perfectly converged. Adding a whole different machine in the mix - even with the same tubes and lenses (XGLC/G70) - would seem like a pain in the ass and probably not worth it. Maybe you could trade somebody who was interested in trying one of the other machines.
Yonex... wasn't it you that already had a VLC-based XG stack running and sold the machines?!??!
SC
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Moose
Joined: 09 Mar 2006
Posts: 788
Location: Minnesota
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| Posted: Tue Dec 04, 2007 8:21 pm Post subject: |
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| Fujifrontier wrote: | | what is the difference between stack and blend? |
Stacking projectors means to display their outputs over the same area. It's done mainly for increased brightness.
Blending projectors means to display their outputs side by side, top or bottom. In home theater it nearly always means side by side. The advantage is that all the raster is used as each projector is set to 4:3, thus maximum resolution and sharpness. The same input is fed to a dual scaler, or two scalers, with special blending circuitry that halves the picture and sends the right half to one projector and the left to the other. In practice, it's a bit more than half as there must be some overlap in the middle. The blending circuitry must then reduce brighness in the overlap area so that it doesn't stand out.
Blending scalers are expensive but are getting cheaper. Still, they are a far cry from cheap. Both stacking and blending are difficult to set up. Even so, it's my goal to get into blending one day.
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Tue Dec 04, 2007 11:37 pm Post subject: |
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The XG is pretty flat on top so the g-70 should stack nicely on top of it 
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Chip
A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Tue Dec 04, 2007 11:41 pm Post subject: |
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LOL
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CRT.
HD done right!
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Wed Dec 05, 2007 12:04 am Post subject: |
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G70 would crush the poor NEC.
If I had to pick too different projectors to stack or blend it would be an XG LC and a G70.
Seagull differences at the top may be the biggest problem (?).
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Wed Dec 05, 2007 1:16 am Post subject: |
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Some little guys like big girls on the top.................Hey, what happened to the stereo
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Chip
A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
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| Posted: Wed Dec 05, 2007 2:50 am Post subject: |
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I'm gonna stack my Vision 600 with my 808s. Yeah, bitches.
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Gino
Joined: 22 Apr 2006
Posts: 1363
Location: Trinity Beach, AUSTRALIA
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| Posted: Wed Dec 05, 2007 11:24 am Post subject: |
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| Fujifrontier wrote: | | what is the difference between stack and blend? |
see my thread: http://www.curtpalme.com/forum/viewtopic.php?p=63558
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yonexsp
Joined: 25 Apr 2006
Posts: 311
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| Posted: Thu Dec 06, 2007 2:02 am Post subject: |
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| ecrabb wrote: | A stack completely overlays the images each projector produces. You get twice the brightness, but it costs you in terms of sharpness. Unless you use a newer very stable projector, convergence can also be a pain in the ass. A stack can be over/under or side-by-side, depending on room and configuration constraints, and how much geometry control the projectors have.
Blending is short for edge-blending. In that configuration (for HT at least), two projectors project two images on the screen side-by-side, where a portion of the image from each overlaps one another. Then, you use a processor to ramp the luminance down on one and up on the other to create a seamless blend between the two. You get the brightness of a stack on a large screen, but the sharpness of a single projector. You also typically use more phosphor. The con is that it either requires expensive hardware to do the blend (Analog Way Di-VentiX - AKA Blendzilla), or a kludgy HTPC/software-based solution, which generally limits source material to only HTPC-based sources.
Personally, I think it would be difficult enough getting two of the same machine perfectly converged. Adding a whole different machine in the mix - even with the same tubes and lenses (XGLC/G70) - would seem like a pain in the ass and probably not worth it. Maybe you could trade somebody who was interested in trying one of the other machines.
Yonex... wasn't it you that already had a VLC-based XG stack running and sold the machines?!??!
SC |
It was, I also drive tested a few cheap edge blenders as well. Lots of posts about that on AVS. But I sold the 2 XG's I used for that and traded up to an XGLC. Now I got the bug to go big again, and was thinking of going Grey!! aahhh, then I thought, screw that, I loved the look of the stack.
But, can't seem to find reasonably priced XGLC's. But with a 1080p digitals knocking about for $2500 nearly I'm not interested in paying even half that for another CRT. But the Sony's seem to be selling more cheapely so I thought, hummmmmmmmmm, maybe.
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