JVC RS4500 (native 4K laser projector)

[mark_h]

How do you lose ANSI CR with a lens?

 

Another "layer" in front of lens - that big chunk o' glass reflecting/scattering light perhaps?  The difference to me was very easy to see.   Although maybe I set my ISCO up poorly? eek!

[AVSCraig]

 

Another "layer" in front of lens - that big chunk o' glass reflecting/scattering light perhaps?  The difference to me was very easy to see.   Although maybe I set my ISCO up poorly? eek!

It's hard to put more glass in front of an already outstanding lens like the RS4500 has. It's another dust surface too. Anyway, with the Masciola test patterns being so fast to pull up, and the fact I don't change aspect ratios every day anyway, double checking focus for optimal picture sharpness is just part of the game, for the very best picture.

[AVSMike]

To be clear, I have a slide too (Cineslide) and don't have the lens in play with 16x9 (unless, like you, I'm Anamorphic B mode to quickly access a menu).   I would have thought having the lens in play with scope material would have been brighter than zooming out, but it doesn't feel like it is.   Anyway, there are pros on cons.  Like you mentioned, it is SO much faster to slide in the lens and since you don't change lens memories there is no need to re-focus every so often.  There may even be a plus to on/off contrast. 

That said, I think I prefer the image zoomed out.  Maybe because the ANSI is better?  (this is just a guess based off a recent post) but it's very close and I alternate between the two methods. 

I have a feeling that I will end going with the zoom method only so it will be easier to build a hush box (which will be complicated due to the exhaust being out the front).  High laser, while overkill on SDR, just looks too good on HDR.

Hush box can be a lot smaller, without using an A-lens. I contemplated installing a hush box, but once I got my powered dead vent in place and a remote sensor installed for the HVAC, I am in pretty good shape, noise wise. Would I like it quieter, of course, but with medium power for HDR, it is perfectly fine. My screen is smaller and throw is shorter, so even though my screen gain is lower than yours, I still get quite a bit of brightness.

[AVSCraig]

It's certainly amazing how good Blu-rays can look on the RS4500, like " The Pacific ".









Despite using the cheapest Canon point 'n shoot camera, which makes getting a proper exposure difficult. The picture looks better still on the screen.

[AVSCraig]

Screen shots from " Life " -

[AVSCraig]

Where did everyone go ? Too busy watching your RS4500's to post ?

[Kris Deering]

Has been quiet lately, but I think that kind of comes with this time of year. Plus this projector has a smaller owner list (as expected). Still enjoying mine on the bigger screen. Not perfect, but more than satisfying!!

[AVSCraig]

So if anyone is having lip sync issues with their RS4500 with HDTV ( I am ), it seems that turning on the low lag " game mode " more or less corrects it. Worth a try, since it doesn't appear to be correctable using audio delay in my receiver. What I need is a " video delay " adjustment.   

[mark_h]

The audio visual delay on the Z1 is longer than it was on my Sony 1000, so I ended up remeasuring.  I use different delays depending on the source (eg DVD vs Blu vs UHD vs Amazon Fire vs Shield and so on) and also the audio codec as some come through with different delays.

It's actually a real pain that manufacturers don't agree on some way to resolve this, eg all devices should be 0 latency on audio AND visual feeds, but they aren't.

I use a Syncheck3 to measure my lipsync, but that's no longer available.  The Sync-One2 is the next best thing:

http://www.sync-one2.co.uk/

[AVSCraig]

The audio visual delay on the Z1 is longer than it was on my Sony 1000, so I ended up remeasuring.  I use different delays depending on the source (eg DVD vs Blu vs UHD vs Amazon Fire vs Shield and so on) and also the audio codec as some come through with different delays.

It's actually a real pain that manufacturers don't agree on some way to resolve this, eg all devices should be 0 latency on audio AND visual feeds, but they aren't.

I use a Syncheck3 to measure my lipsync, but that's no longer available.  The Sync-One2 is the next best thing:

http://www.sync-one2.co.uk/

I like that, and it would be interesting to use one, but since my only lip sync problem involves cable TV ( none at all with Blu-ray / 4K Blu-ray ), I'm wondering how I would get a test signal to work ? I'd need a " Sync - One2 test signal channel " on AT & T U Verse cable TV.

[mark_h]

Yeah, TV is a pain... I typically just put up a 24 hour news service and dial it in by hand while watching the newsreader's lips...

[mark_h]

New firmware!

http://www3.jvckenwood.com/english/download/dla-z1_rs4500/

Improvement of display problem at pixel adjustment
Improvement of image quality at 12bit input

[AVSCraig]

New firmware!

http://www3.jvckenwood.com/english/download/dla-z1_rs4500/

Improvement of display problem at pixel adjustment
Improvement of image quality at 12bit input

I guess I know what I'm doing tonight ! " Improvement of display problem at pixel adjustment " - not sure what that is, but any and all improvements are always welcome !

[Madfloyd]

So if anyone is having lip sync issues with their RS4500 with HDTV ( I am ), it seems that turning on the low lag " game mode " more or less corrects it. Worth a try, since it doesn't appear to be correctable using audio delay in my receiver. What I need is a " video delay " adjustment.

Thanks for this, Craig, looking forward to trying it as it's been driving me nuts!

[Madfloyd]

It's been a while since I've been on the forum so I just thought I'd share my most recent thoughts on the RS4500:

I think it's just incredible that one can have the experience I've been enjoying in their own home.  I discovered home theater in 1993 and when my wife and I married in 1994 we told all our guests that we were saving up for a large rear projection TV.  Most of our guests jumped on this idea and we started our home theater with the TV and a laser disc player. 

A couple years later we were fortunate enough to move out of our apartment into a house and had a dedicated room in the basement for our theater.  In 1997 we got our first projector - a Runco 980 CRT with an 96" wide screen (slightly larger than what it probably should have been for optimal viewing quality but we loved it).   Along with some decent speakers and electronics it was our first big 'investment' in home theater.   

That Runco came with us when we moved 7 years later and became my first 'HD' projector when HDDVD and Bluray came on the scene in 2005.   

About a year or so later I discovered CIH and went digital with JVCs splash entry into home theater - the RS1.  That with a high gain 11 foot wide 2.35:1 screen changed my home theater life forever!

I became obsessed with the hobby and it wasn't long before I invested heavily into a Sim2 C3X1080 (3 chip DLP).  I also bought an ISCO3 and a Cineslide. I had this setup for a blissful 10 years before replacing the Sim2 with the RS4500.

While there is no doubt a different 'look' to the RS4500 compared to the Sim2 (which I still think looks very very good with its quality of color and ANSI contrast) the RS4500 has taken my experience to a level that I never thought would be possible.  Sometimes I just giggle at how good the picture is and every day I think that I am a VERY lucky man.

For the past week I've been ripping the remaining discs in my Bluray collection.   I have close to 40 terrabytes on my movie server and not counting music videos or TV shows, I am close to 1600 titles.

Life is good, very very good.