JVC RS4500 (native 4K laser projector)

[AVSCraig]

Kris, a less technical detail, I'm interested in how loud it is relatively speaking.  My PJ is soffit mounted not far from my head and I'm worried this one will be too loud.  Maybe that's something you can share before the review.

It certainly didn't sound loud even in high brightness mode for HDR at Cedia. They had it out in the open in their private suite, and I made a point of listening to it.

[mark_h]

I can say that the dynamic laser modulation has a PROFOUND influence on perceived contrast...

Does that imply that NATIVE looks poor?

[AVSMike]

Does that imply that NATIVE looks poor?

I will let Kris answer it, but I am happy camper.

[Javs]

I will let Kris answer it, but I am happy camper.

Have you got your projector already Mike?

[Kris Deering]

Does that imply that NATIVE looks poor?

Native is lower than the current JVC line but in line with what I saw from the Sony and Epson's depending on how you have it setup. So not poor, but definitely a step back from the other JVCs. But the laser modulation goes a long way to filling in gaps.

[Kris Deering]

Do you have Lucy on blu-ray? There's a scene at the beginning of the film where the Sony 4K's are exhibiting quite a bit of banding and posterization:

JVC (eshift) vs Sony
http://screenshotcomparison.com/comparison/184542

Here's a close up where I've highlighted the issues:

(Click to see the full resolution image)

JVC RS4500 (native 4K laser projector)

Posterization shown in the top large red box, and banding shown in the bottom two red boxes

This type of banding and posterization happens quite frequently on the Sony 4K's from what I've seen. That shot above shows the issue quite well IMO.

Looking at the same scene with the standard Blu-ray of Lucy it looks nearly identical to the JVC in your high resolution pic. None of the banding that I see in your pic of the Sony. So looks all clear here.

[Javs]

Native is lower than the current JVC line but in line with what I saw from the Sony and Epson's depending on how you have it setup. So not poor, but definitely a step back from the other JVCs. But the laser modulation goes a long way to filling in gaps.

Hi Kris, I posted this on AVS but will repeat it here. I think going forward with these laser projectors, I think the most useful information would be contrast ratio measured at multiple APL levels, in addition to the regular 50% ANSI measurement.

What I really want to know,

At 16fl, what is the contrast ratio at 1% APL.

We know dimming takes care of 0%, then 1% through 4% is critical information and will actually tell us a lot.

For Eg, my X7000 at Low lamp -10 it does this:

0% - 48,571:1
1% - 45,945:1
2% - 15,962:1
3% - 6,273:1
4% - 3,238:1

If you could grab those measurements and let us know, I know it would just put a lot of us at ease.

[Kris Deering]

Hi Kris, I posted this on AVS but will repeat it here. I think going forward with these laser projectors, I think the most useful information would be contrast ratio measured at multiple APL levels, in addition to the regular 50% ANSI measurement.

What I really want to know,

At 16fl, what is the contrast ratio at 1% APL.

We know dimming takes care of 0%, then 1% through 4% is critical information and will actually tell us a lot.

For Eg, my X7000 at Low lamp -10 it does this:

0% - 48,571:1
1% - 45,945:1
2% - 15,962:1
3% - 6,273:1
4% - 3,238:1

If you could grab those measurements and let us know, I know it would just put a lot of us at ease.

What are you using for proper measurement patterns for each of these APLs? Also, the laser function on this is different than say the Epson, so measuring it more traditionally applies more to this than it does the Epson presently. But I could do something along these lines with the proper patterns.

[AVSMike]

Have you got your projector already Mike?

No, just going by the confirmation by third party what I was told this projector would do. Especially pleased that dynamic dimming works well.

[Javs]

What are you using for proper measurement patterns for each of these APLs? Also, the laser function on this is different than say the Epson, so measuring it more traditionally applies more to this than it does the Epson presently. But I could do something along these lines with the proper patterns.

Hi Kris,

I just used the AVS709HD patterns, they have 0% black, 1% grey, 2%, 3%, 4% grey fields etc. It will at least tell you the luminance levels at those points, then when divided into the white peak you have a number.

I would be interested in those measurements with a chart similar to what projection dream uses, but I don't know where to get those.

[DavidHir]

Kris,

I would be curious of your take of how much more detail the RS4500 has over the RS500 in terms of detail on native 4K UHD BD content from your seating distance to the screen.  Is it pretty subtle?  Moderate?  Or large?  Thanks.

[Dylan Seeger]

Kris,

I would be curious of your take of how much more detail the RS4500 has over the RS500 in terms of detail on native 4K UHD BD content from your seating distance to the screen.  Is it pretty subtle?  Moderate?  Or large?  Thanks.

I think this is going to be hard to quantify. I really think this comes down to screen size, screen material (which I think is going to be extremely important going into 4K), seated distance and visual acuity. Though I'm sure he'll still give us his subjective opinion. Due to the higher brightness and probably high ANSI contrast I don't doubt he'll have something favorable to say on the matter.

[Dylan Seeger]

Looking at the same scene with the standard Blu-ray of Lucy it looks nearly identical to the JVC in your high resolution pic. None of the banding that I see in your pic of the Sony. So looks all clear here.

Thank you VERY much for confirming that the issue is not there with their native 4K DiLA panels. If they can achieve similar or better on/off to the 5000ES then I think this will be a home run for JVC.

[DavidHir]

I think this is going to be hard to quantify. I really think this comes down to screen size, screen material (which I think is going to be extremely important going into 4K), seated distance and visual acuity. Though I'm sure he'll still give us his subjective opinion. Due to the higher brightness and probably high ANSI contrast I don't doubt he'll have something favorable to say on the matter.

Yep, that's why I said "your take" from "your seating seat distance".

[ARROW-AV]

Hi Kris, I just used the AVS709HD patterns, they have 0% black, 1% grey, 2%, 3%, 4% grey fields etc. It will at least tell you the luminance levels at those points, then when divided into the white peak you have a number.

Javs, given that's a Blu-Ray Disc that's not reference... For accuracy you must use a reference pattern generator like the Murideo SIX-G 4K HDR for example... Just checking that you know / are aware of this, which I am sure you are... There are some comparatively less expensive but still good pattern generators out there, so given you are clearly very much into your measurements (which is great) you might want to think about investing in one... It's well worth it IMO