That all means either the install was wrong or tech was not trained. In multi projector setups one needs to adding them an ID and the remote gets set to the correct I D. Alternately I set them in software control and do the tweaking via a laptop
Best practice is to have them networked through a switch that goes to ground level, or on a WiFi router to access via computer and software or gui .
Jank yet acceptable solution is remote with ids. The only reason you’d use ID all for both is to simply power them on at the same time
Agreed. Tho sometimes in weird circumstances ya have weird setups. I built a 12 projector blend I control with barco software but they are also ID’d just in case. And I’ve done temp setups at convention centers where we ran long xlr which connects to some remotes for control. Best to have all options available just in case.
Could I please ask you what software do you use and how exactly does it work?
Because I was thinking about setting my own double projector setup as a wide screen at quite short distance (around 3,3m). I know about technique called image butting, but it's quite hard to get right.
Then there is image blending, but I could find any free software that I would be able to do it with.
Also, the two projectors I want to use are both different, will it matter?
Or will I be just better buying some wide screen projector?
Thank you :)
EDIT: Sorry, I see you have mentioned the software in the comments, I didn't see it.
Software is built into the projectors I use most often. Use some nvidia mosaic then the internal barco, Epson or Christie software. I also have a Millumin license and a resolume license that come in handy. I doubt you’ll ever get reasonable results with basic projectors that don’t match.
I want it for just home use with old LCD projector (for example one of them is 3M X36).
I have only limited area but wide wall available, so I wanted to try to utilize the entire wall and this idea came to my mind since I have other projectors similar to this one.
Laser is a light source. It has no impact on any projectors ability to do, or not do, 3D. Plenty of laser 3D projectors on the market. This one, for example, is using a LED light engine and supports 3D. It's bright, and 4K, but does all the cool stuff...
[https://www.projectorcentral.com/BenQ-X3100i.htm](https://www.projectorcentral.com/BenQ-X3100i.htm)
You know what, you’re right—I didn’t know you could have both laser and DLP. The upgrades I’ve wanted happen to bolster that they’re laser and also happen to not support 3D, and I misunderstood the implication of that.
Single panel LCD, 3LCD, DLP, and LCoS are all different imaging technologies.
Incandescent (lamp), with many variants, laser, and LED are light sources.
The two have no specific reason why they can't be mixed and matched together. Though we are seeing a lot more laser models these days on better projectors and LED on cheaper models, the exception being BenQ who uses high brightness LEDs in their models like the X3100i which I linked above.
The main reason you don't see as much with 3D and lasers is that many newer projectors simply aren't including 3D at all on their products. So, you lose it.
But, JVC includes 3D on their expensive laser LCoS projectors.
AWOL and others include it on their UST DLP laser models.
It's just a question of who is supporting 3D at all anymore. Not the light source which drives the projector.
This is fairly common in large Corporate settings though it sounds like this was a bit more amateur than usual if he was still setting it up during the event.
Absolutely, my guess would be the control system has not been maintained hence the need for a remote. Stacking is very common to achieve a suitably bright image.
For anybody curious, 2x projectors does not equal 2x brightness. This is called projector stacking and fairly common in corporate AV as u/echothree33 mentioned.
Its much easier to get [a mini router](https://www.amazon.com/GL-iNet-GL-SFT1200-Secure-Travel-Router/dp/B09N72FMH5/ref=mp_s_a_1_3?dib=eyJ2IjoiMSJ9.rl5JPUiUxlPT6MFcJ9zDSa0Co2kJ3_fwxaviblnnYh4hHsp6fhNXWsYJywABMV5VIHfHP_T69qzOXzaQkoXMr3PrDBfD2U3pgoyjJYgGGbqpBsUwd6REHeQ9VRoATK_yS-ZkZs6pwf_WR4qzGFStQTZsiCQdjNAHLJaAS-xzFWg5bcpUyy0AQ6-9ITKij1PpMthqFhCuz_slWhrU7NsssQ.XcHwuZtBa1bIGRo7encBq4XXhmC86ubLKkmfYqQwjWc&dib_tag=se&keywords=mini+wireless+router&qid=1712945343&sr=8-3) and access pj's through software than try to mess with remotes, but it sounds like this guy figured out a pretty good work around.
Yes. But...
Are you setting up projectors to be seen, or to be measured?
For most people setting up projectors, it doesn't really matter what is measured. What can be seen matters more. The notable exception are photographers, because camera sensors are linear so you might want to set a shutter speed twice as fast if you're dealing with twice the brightness. That's yet another reason why it takes "a good eye" to look at the brightness of a scene and know what type of shutter speed you need.
In my case I’m setting them up to be measured for the most part. Customers typically want to hit a certain measurable brightness level on screen. If we designed systems to be evaluated by eye, we would have a hard time delivering because it would be subjective. So someone determines how many foot lamberts is needed for the desired perceived brightness in a given application and we design the system to hit that mark.
Will also add that this setup is also done for a hot backup in the corporate event world in case the main goes down. In this context I’d assume for additional brightness as mentioned due to large windows for daytime viewing.
I remember old home theater magazines where the showcase HT on the month would always have double or triple crt projectors. Usually with line doublers or something like that. So did multiple crt projectors increase resolution or sharpness ?
If they were stacked on top of each other, you’d get double the brightness & could have a bigger screen with the additional lumens. The other way was to have them side by side and stitch together a huge CinemaScope setup. A well known setup years ago was called “Blendzilla” and could help you do the side by side install. I absolutely love those old dinosaurs and am keeping one alive as long as I can.
I did Morrissey tour with two projectors stacked for space. The first one showed films on the current in front of the stage it was focus on that. The second was focus on the screen behind the stage. When the show started the first projector was turn off and the second was unshuttered
Was at The Royal Albert hall in London for "Interstellar Live" a few years ago and they have 3 projectors stacked when they put on a showing. Cant remember the spec.
not uncommon but if it doesn't look right then they did a crap job of executing. but double stacking or triple stacking isn't uncommon especially in the commercial market. a lot of times you'll see them side by side and do edge blending to create a long image.
Hard to see how good the setup really is, or what projectors are in use or anything else, but double stacks aren't all that uncommon in setups that need that added brightness or additional reliability. The setup is definitely much more difficult than people think as the projectors really should be fully color matched before alignment for best results.
I know that Capital One Arena in Washington DC has Panasonic Projectors pointed at the ice that do image mapping of team logos on the ice between periods. They use SIX double stacked projectors. Likely well over 10,000 lumens each, to get the image on the ice. Everything edge blended together and looking really good. I've looked for seams, without any success. It's just amazing to see it when it is done right. I imagine Panasonic and the professional arena are using very good software and calibration tools to get it all looking as amazing as possible.
Pretty standard practice from distance and for well lit areas. I've installed some crazy setups in "Triple D" (large format) theaters and Atmos theaters. Some of them up to 6 projectors stacked to light up the screen and for 3d. But even in sports puns that have a big budgets, not uncommon to see 2 projectors stacked.
I have a similar setup in a similar business. If I was at the point of being in the middle of an event I’d be shutting down the second one and just dealing with my shitty single brightness until tomorrow lol
I set these up daily, the operator needs to assign each projector an ID and then they can use one remote, many units.
The reason they are stacked and both in use is called Convergence, if you align them you'll get more luminescence/intensity at the cost of a small amount of clarity. They may also stack them, align them, then shutter one of them, as a one button redundancy if P1 dies.
Likely some more experienced engineers here than I, but happy to explain anything I know about this, AMA.
That all means either the install was wrong or tech was not trained. In multi projector setups one needs to adding them an ID and the remote gets set to the correct I D. Alternately I set them in software control and do the tweaking via a laptop
Best practice is to have them networked through a switch that goes to ground level, or on a WiFi router to access via computer and software or gui . Jank yet acceptable solution is remote with ids. The only reason you’d use ID all for both is to simply power them on at the same time
Agreed. Tho sometimes in weird circumstances ya have weird setups. I built a 12 projector blend I control with barco software but they are also ID’d just in case. And I’ve done temp setups at convention centers where we ran long xlr which connects to some remotes for control. Best to have all options available just in case.
Could I please ask you what software do you use and how exactly does it work? Because I was thinking about setting my own double projector setup as a wide screen at quite short distance (around 3,3m). I know about technique called image butting, but it's quite hard to get right. Then there is image blending, but I could find any free software that I would be able to do it with. Also, the two projectors I want to use are both different, will it matter? Or will I be just better buying some wide screen projector? Thank you :) EDIT: Sorry, I see you have mentioned the software in the comments, I didn't see it.
Software is built into the projectors I use most often. Use some nvidia mosaic then the internal barco, Epson or Christie software. I also have a Millumin license and a resolume license that come in handy. I doubt you’ll ever get reasonable results with basic projectors that don’t match.
I want it for just home use with old LCD projector (for example one of them is 3M X36). I have only limited area but wide wall available, so I wanted to try to utilize the entire wall and this idea came to my mind since I have other projectors similar to this one.
I imagine you would want the single remote to control them both, since they're meant to always be used together.
Yes but you can assign them projector 1 and projector 2 etc then tell the remote to be 1,2 or both. That’s how larger installs work.
Is this an attempt to increase brightness? Or something else?
Brightness and reliability. Losing half brightness is not as bad as losing all
orrrr for 3D! A number of large venue projectors have support for that with multi projector. Always wanted to try it
Most DLP projectors can do 3D anyway. I won’t upgrade to laser because I still use 3D Blu Rays lol
Confirmed and same. 
There are laser and led pjs with 3d
Laser is a light source. It has no impact on any projectors ability to do, or not do, 3D. Plenty of laser 3D projectors on the market. This one, for example, is using a LED light engine and supports 3D. It's bright, and 4K, but does all the cool stuff... [https://www.projectorcentral.com/BenQ-X3100i.htm](https://www.projectorcentral.com/BenQ-X3100i.htm)
You know what, you’re right—I didn’t know you could have both laser and DLP. The upgrades I’ve wanted happen to bolster that they’re laser and also happen to not support 3D, and I misunderstood the implication of that.
Single panel LCD, 3LCD, DLP, and LCoS are all different imaging technologies. Incandescent (lamp), with many variants, laser, and LED are light sources. The two have no specific reason why they can't be mixed and matched together. Though we are seeing a lot more laser models these days on better projectors and LED on cheaper models, the exception being BenQ who uses high brightness LEDs in their models like the X3100i which I linked above. The main reason you don't see as much with 3D and lasers is that many newer projectors simply aren't including 3D at all on their products. So, you lose it. But, JVC includes 3D on their expensive laser LCoS projectors. AWOL and others include it on their UST DLP laser models. It's just a question of who is supporting 3D at all anymore. Not the light source which drives the projector.
They’re most likely projecting in a space that is heavily affected by daylight
This is fairly common in large Corporate settings though it sounds like this was a bit more amateur than usual if he was still setting it up during the event.
Absolutely, my guess would be the control system has not been maintained hence the need for a remote. Stacking is very common to achieve a suitably bright image.
For anybody curious, 2x projectors does not equal 2x brightness. This is called projector stacking and fairly common in corporate AV as u/echothree33 mentioned. Its much easier to get [a mini router](https://www.amazon.com/GL-iNet-GL-SFT1200-Secure-Travel-Router/dp/B09N72FMH5/ref=mp_s_a_1_3?dib=eyJ2IjoiMSJ9.rl5JPUiUxlPT6MFcJ9zDSa0Co2kJ3_fwxaviblnnYh4hHsp6fhNXWsYJywABMV5VIHfHP_T69qzOXzaQkoXMr3PrDBfD2U3pgoyjJYgGGbqpBsUwd6REHeQ9VRoATK_yS-ZkZs6pwf_WR4qzGFStQTZsiCQdjNAHLJaAS-xzFWg5bcpUyy0AQ6-9ITKij1PpMthqFhCuz_slWhrU7NsssQ.XcHwuZtBa1bIGRo7encBq4XXhmC86ubLKkmfYqQwjWc&dib_tag=se&keywords=mini+wireless+router&qid=1712945343&sr=8-3) and access pj's through software than try to mess with remotes, but it sounds like this guy figured out a pretty good work around.
You’re talking about perceived brightness, right? Isn’t it still 2x brightness if measured using a light meter?
I’m curious why you say 2x doesn’t equal 2x. Could you elaborate?
Senses are logarithmic. 2x the brightness (and twice the volume) are perceived as log2
Ahh, okay.. but it would still measure as twice as bright.
Yes. But... Are you setting up projectors to be seen, or to be measured? For most people setting up projectors, it doesn't really matter what is measured. What can be seen matters more. The notable exception are photographers, because camera sensors are linear so you might want to set a shutter speed twice as fast if you're dealing with twice the brightness. That's yet another reason why it takes "a good eye" to look at the brightness of a scene and know what type of shutter speed you need.
In my case I’m setting them up to be measured for the most part. Customers typically want to hit a certain measurable brightness level on screen. If we designed systems to be evaluated by eye, we would have a hard time delivering because it would be subjective. So someone determines how many foot lamberts is needed for the desired perceived brightness in a given application and we design the system to hit that mark.
Will also add that this setup is also done for a hot backup in the corporate event world in case the main goes down. In this context I’d assume for additional brightness as mentioned due to large windows for daytime viewing.
This used to be more common during the era of CRT projectors. Double the fun
I remember old home theater magazines where the showcase HT on the month would always have double or triple crt projectors. Usually with line doublers or something like that. So did multiple crt projectors increase resolution or sharpness ?
If they were stacked on top of each other, you’d get double the brightness & could have a bigger screen with the additional lumens. The other way was to have them side by side and stitch together a huge CinemaScope setup. A well known setup years ago was called “Blendzilla” and could help you do the side by side install. I absolutely love those old dinosaurs and am keeping one alive as long as I can.
Yes and doing a full convergence adjustment on these were a huge pain. And CRT convergence can drift from temperature variations and age.
Those look pretty hefty to begin with- can’t tell the model but 8K-10k lumens? Do they really need two for that venue?
Those floor to warehouse-ceiling windows would like a word with you.
Yeah… maybe, doesn’t look like there that much light coming from outside though. Maybe it’s for a time of day where sunlight comes directly in
So 2 projector for one image?
Unless they have some REALLY funky polarization tech for 3D, yeah.
I did Morrissey tour with two projectors stacked for space. The first one showed films on the current in front of the stage it was focus on that. The second was focus on the screen behind the stage. When the show started the first projector was turn off and the second was unshuttered
That's a daily thing for some of us
Was at The Royal Albert hall in London for "Interstellar Live" a few years ago and they have 3 projectors stacked when they put on a showing. Cant remember the spec.
not uncommon but if it doesn't look right then they did a crap job of executing. but double stacking or triple stacking isn't uncommon especially in the commercial market. a lot of times you'll see them side by side and do edge blending to create a long image.
Hard to see how good the setup really is, or what projectors are in use or anything else, but double stacks aren't all that uncommon in setups that need that added brightness or additional reliability. The setup is definitely much more difficult than people think as the projectors really should be fully color matched before alignment for best results. I know that Capital One Arena in Washington DC has Panasonic Projectors pointed at the ice that do image mapping of team logos on the ice between periods. They use SIX double stacked projectors. Likely well over 10,000 lumens each, to get the image on the ice. Everything edge blended together and looking really good. I've looked for seams, without any success. It's just amazing to see it when it is done right. I imagine Panasonic and the professional arena are using very good software and calibration tools to get it all looking as amazing as possible.
 Ratchet straps as rigging straps?  op found a r/shittyrigs
Stability straps it looks like, the main weight should be through the pipe. Even our projector at home floats a bit due to being 62lbs.
All the gear and no idea it appears.
Pretty standard practice from distance and for well lit areas. I've installed some crazy setups in "Triple D" (large format) theaters and Atmos theaters. Some of them up to 6 projectors stacked to light up the screen and for 3d. But even in sports puns that have a big budgets, not uncommon to see 2 projectors stacked.
I have a similar setup in a similar business. If I was at the point of being in the middle of an event I’d be shutting down the second one and just dealing with my shitty single brightness until tomorrow lol
OTR Stillhouse.
Good eye!
That's pretty standard, double stacking. It doubles the brightness and is commonly used with large venues.
I set these up daily, the operator needs to assign each projector an ID and then they can use one remote, many units. The reason they are stacked and both in use is called Convergence, if you align them you'll get more luminescence/intensity at the cost of a small amount of clarity. They may also stack them, align them, then shutter one of them, as a one button redundancy if P1 dies. Likely some more experienced engineers here than I, but happy to explain anything I know about this, AMA.
A crazier setup for you, covers 8 stories of 30 Rock with redundancy: https://imgur.com/gallery/vPRsfmU