Originally Posted by Mike Garrett
If your room does not get hot, then the projector is not loud. I have had several people (two forum members in the last two days) over to my HT and none of them have thought the projector loud. I am sure they expected a much louder fan noise. An expectation based on what they read on the forum. It is not the projectors fault if you are using it in a room that is not designed to cool it properly. Would you say a Barco 6P laser needed a firmware update, if you used it in your theater, rather than in a dedicated booth or would you say it was not set up properly? When I first got my RS4500, I also thought it was on the loud side, but after taking starting and ending temperature measurements, it was obvious what the problem was. I corrected my room and now I have no problem with the fan noise. Now if JVC can make it even quieter, I will gladly take that, just like I would take an improvement in any area for any projector. JVC specifications tell you 750 watts for the RS4500, so design/make provisions accordingly. The lower level JVC's are 380 watts. Not near the same heat output.
I use the iris on mode 1 for BD and off for UHD. While I wish that the dynamic dimming system was better, I have that same wish for all the other dynamic dimming systems that I have seen.
I'm sorry but I find this post to be somewhat misleading. The projector certainly has a few issues. That's why owners are anxiously waiting for the firmware update. Its a great projector, but its not flawless.
I keep my house super cool. 66 at night and 70 during the day. Since when does having a projector mounted to the ceiling in a wide open room, that is cooled to 72 degrees, constitute a faulty room design? It doesn't.
Comparing the JVC to a Barco cinema unit is like comparing apples to camels. The two have nothing in common. My Barco 4K DCI units, did require external venting and it had a place to attach an 8" duct. This projector also wasn't designed to be placed in a HT directly over your head, but in a dedicated projector booth. The Barco projector weighed 350 lbs and was the size of a refrigerator.
Was the JVC designed to require a hush box or projection booth? Not to my knowledge.
Also, the dynamic dimming is far from perfect, or anywhere near as good as the best dynamic systems. It is basically unusable, since it seems to react a split second too late, causing a flash when switching from bright to dark scenes. I certainly expect JVC will improve this, and when they do, that will be fantastic.
There seems to be this push to convince people the RS4500 is flawless, and that's not the case. It's a great projector, but there is still plenty of room for improvement. And I have no doubt JVC will improve it.
This projector has limits like all units do. If you have a 12' wide or smaller screen, especially one with a 1.0-1.3 gain, where you can run in mid-Laser power, and even close the iris some, you have a perfect setup. If you have to run the projector in high-Laser power, I would hope you have the unit in a dedicated projection area or in a hush-box. Hopefully the firmware update will help make this no longer an issue.
I have spent most of my time comparing the JVC to the Sony 5000, and the JVC compared very well. It's no where near as bright, but not everyone needs the sheer light output the Sony is capable of. Contrast between to two units is very similar. I actually watched almost an entire movie with the left side of the image being projected by the RS4500 and the right side projected by the 5000ES. To me this is the best way to really compare the two units.
Both projectors are exceptionally great units, and in a blind split screen setup, with the Sony Laser dialed down to equal the JVC, I don't think anyone could distinguish between the two units. That speaks very well of the JVC which is significantly less money.
I finally removed my RS600 from my bedroom, so I could do direct comparisons between the RS4500 and the RS600. The first thing you notice, right off the bat, is how much better the contrast is on the RS600. This is especially the case with low APL style movies like Harry Potter.
It's clear the biggest competitor to the RS4500 is the RS500/600 and RS520/620. When you look at what those units can do for the price, it's astonishing.
I really want to do a dual stack RS600 to compare against the RS4500. I think that would be an incredible test. While in theory that sounds great, I have my doubts about keeping two units lined up perfectly, especially over a lengthy period of time. Not to mention, you would have to sacrifice the use of lens memories. But the thought of a dual stack, which could easily produce 2500-3000 calibrated lumens with a native contrast in the 80k:1 range and the dynamic contrast 10 times higher, would be impressive.
I have never been one of those guys who weighs sequential contrast above all other aspects. Especially with large screens, there were other equally important issues, like proper amount of light output, lens quality, uniformity, etc.
The good news is that projectors continue to be brighter and brighter and capable of lighting larger and larger screens, while at the same time maintaining high sequential contrast. Now we just need Sony and JVC to get the sequential contrast up significantly with these true 4K chips, and that will really be the last missing piece to the puzzle.