Official JVC - 20LTD - RS640 (x990/x9900) - RS540 (X790/x7900) - Owners Thread - Page 403 - AVS Forum | Home Theater Discussions And Reviews
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post #12061 of 13600 Old 08-17-2019, 05:04 AM
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Quick question about the x790. When I first got it a few months ago the iris was silent and on the screen its operation was pretty seamless. However, in the past week, I’ve noticed pumping/flashing that is obvious and quite distracting. Then last night I noticed the iris was clicking when the pumping was occurring.

Is this a known issue with the iris?

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post #12062 of 13600 Old 08-17-2019, 05:14 AM
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Just received a X7900, and Chief RPA281, CMS003.
The CM115 ceiling plate is already properly placed at the ceiling.

I have a quick question on mounting the CMS003 extension column to the ceiling plate.
The manual states: "Tightening with torque exceeding the above range (1.5 n/M and 2.0 n/M) may cause damage to the unit .."

The extension column is painted black, with an "metallic grey" part:


May i assume that i should only tighten until the black part is reached, and not trying to tighten as much as possible?
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post #12063 of 13600 Old 08-17-2019, 06:47 AM
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Quote:
Originally Posted by JonnyVee View Post
Quick question about the x790. When I first got it a few months ago the iris was silent and on the screen its operation was pretty seamless. However, in the past week, I’ve noticed pumping/flashing that is obvious and quite distracting. Then last night I noticed the iris was clicking when the pumping was occurring.

Is this a known issue with the iris?
Sounds like it.
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post #12064 of 13600 Old 08-17-2019, 07:22 AM
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Quote:
Originally Posted by neo_2009 View Post
Just received a X7900, and Chief RPA281, CMS003.
The CM115 ceiling plate is already properly placed at the ceiling.

I have a quick question on mounting the CMS003 extension column to the ceiling plate.
The manual states: "Tightening with torque exceeding the above range (1.5 n/M and 2.0 n/M) may cause damage to the unit .."

The extension column is painted black, with an "metallic grey" part:


May i assume that i should only tighten until the black part is reached, and not trying to tighten as much as possible?
No. Only tighten finger tight. If you torque it tight, even just using your hand, you may not ever get it apart, without destroying the parts. Aluminum threads gaul easily. You are not installing gas line that needs to be airtight. You use the set screw to lock everything down.
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post #12065 of 13600 Old 08-17-2019, 08:09 AM
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No. Only tighten finger tight...
Thank you.
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post #12066 of 13600 Old 08-17-2019, 09:38 AM
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Originally Posted by Dominic Chan View Post
Sounds like it.
Thank you Dominic. I’ll reach out to JVC Canada on Monday.

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post #12067 of 13600 Old 08-17-2019, 10:07 AM
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<<< Click Here >>>
@Dominic Chan is selling loose bulbs that are the right bulbs and very good. They're cheap. I'd suggest one of those. There are guys just buying the bulb without the whole assembly very cheap, I do not know where that post is though
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post #12068 of 13600 Old 08-18-2019, 11:01 AM
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I'm late to the game, but I just ordered one of the last RS540s -- it will replace an 8 year old Sony HW30 which has been a loyal soldier but it was time to move on. I couldn't justify a native 4K with the current levels of contrast and price points. The 540 looks like a good fit.

Plus I need lens memory. Last year I mounted a 2.40 168" diagonal screen and have loved the results, but displaying 16:9 takes a minute of dinking around with the image size by hand so mostly I just don't watch 16:9 content in the theater room, which is a loss.

Looking ahead it appears that native 4K will be realized with a laser light source. Micro LED panels may eventually win the day, but the timing is uncertain and the concept may never be a real projector replacement.

And I will finally have a JVC projector. This tech moves rapidly enough that I just can justify putting big bucks into the latest and greatest only to be facing gear in a few months that is cheaper a better. The price of fleeting bragging rights is too high for a short buzz.
I made the same jump 2 years ago when the RS540 debuted. No regrets. It was a very significant upgrade from the HW30. I highly suggest getting a Panasonic UB820 to do the HDR to SDR BT.2020. HDR is still hit and miss with projectors and I have been more satisfied since using the UB820 in the last year.
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post #12069 of 13600 Old 08-18-2019, 11:22 AM
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Originally Posted by JonnyVee View Post
Quick question about the x790. When I first got it a few months ago the iris was silent and on the screen its operation was pretty seamless. However, in the past week, I’ve noticed pumping/flashing that is obvious and quite distracting. Then last night I noticed the iris was clicking when the pumping was occurring.



Is this a known issue with the iris?


I’ve been noticing the clicking DI on my RS540 over the last few months. What’s odd is that it happens maybe once during a 2 hour movie and tends to work itself out after 30-90 seconds then the DI performs as expected.

Would like to hear what JVC has told others that have experienced this issue.


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post #12070 of 13600 Old 08-19-2019, 05:40 AM
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a) There is no DV for home projection, Dolby have not created it as yet. No-one has done HDR10+ on projection yet from what I can see, either.
b)
Spoiler!
I recently (pre-ordered) a rental of Godzilla - King of Monsters on 4k BD. bluray.com lists the HDR type of this disc as 'Dolby Vision and HDR10+.'

Understanding that DV and HDR10+ have not been implemented into PJ technology to date, how will my RS640 handle the DV and HDR10+ signal it will be receiving when I playback this UHD BD? Any tips or tricks to playing back DV and HDR10+ on my 640?

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post #12071 of 13600 Old 08-19-2019, 06:28 AM
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I recently (pre-ordered) a rental of Godzilla - King of Monsters on 4k BD. bluray.com lists the HDR type of this disc as 'Dolby Vision and HDR10+.'



Understanding that DV and HDR10+ have not been implemented into PJ technology to date, how will my RS640 handle the DV and HDR10+ signal it will be receiving when I playback this UHD BD? Any tips or tricks to playing back DV and HDR10+ on my 640?


Nothing you need to do. The standard HDR10 layer is required and your projector will engage the HDR mode while playing the disc.


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post #12072 of 13600 Old 08-19-2019, 07:30 AM
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Quote:
Originally Posted by JonnyVee View Post
Quick question about the x790. When I first got it a few months ago the iris was silent and on the screen its operation was pretty seamless. However, in the past week, I&#226;€&#x2122;&#xfe0f;ve noticed pumping/flashing that is obvious and quite distracting. Then last night I noticed the iris was clicking when the pumping was occurring.



Is this a known issue with the iris?


I&#226;€&#x2122;&#xfe0f;ve been noticing the clicking DI on my RS540 over the last few months. What&#226;€&#x2122;&#xfe0f;s odd is that it happens maybe once during a 2 hour movie and tends to work itself out after 30-90 seconds then the DI performs as expected.

Would like to hear what JVC has told others that have experienced this issue.


Sent from my iPhone using Tapatalk
I have had pumping and clicking issues with the DI on multiple X790’s. The best thing I ever did was turn it off. Still get fantastic black levels and never have to wonder if the DI is acting up or it was part of the source material. Since I’ve done this I have not had one issue with my projector.

It wasn’t really an issue on SDR material but much more noticeable on HDR material.
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post #12073 of 13600 Old 08-19-2019, 09:18 AM
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Originally Posted by BdoUK View Post
I’ve been noticing the clicking DI on my RS540 over the last few months. What’s odd is that it happens maybe once during a 2 hour movie and tends to work itself out after 30-90 seconds then the DI performs as expected.

Would like to hear what JVC has told others that have experienced this issue.


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Originally Posted by coxy2416 View Post
I have had pumping and clicking issues with the DI on multiple X790’s. The best thing I ever did was turn it off. Still get fantastic black levels and never have to wonder if the DI is acting up or it was part of the source material. Since I’ve done this I have not had one issue with my projector.

It wasn’t really an issue on SDR material but much more noticeable on HDR material.
JVC Canada contacted me and asked me to send them a video. In the meantime, I just turned DI off. Still a great projector with it off.

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post #12074 of 13600 Old 08-20-2019, 07:03 AM
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Originally Posted by JonnyVee View Post
Quote:
Originally Posted by BdoUK View Post
I&#226;€&#x2122;&#xfe0f;ve been noticing the clicking DI on my RS540 over the last few months. What&#226;€&#x2122;&#xfe0f;s odd is that it happens maybe once during a 2 hour movie and tends to work itself out after 30-90 seconds then the DI performs as expected.

Would like to hear what JVC has told others that have experienced this issue.


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Quote:
Originally Posted by coxy2416 View Post
I have had pumping and clicking issues with the DI on multiple X790&#226;€&#x2122;&#xfe0f;s. The best thing I ever did was turn it off. Still get fantastic black levels and never have to wonder if the DI is acting up or it was part of the source material. Since I&#226;€&#x2122;&#xfe0f;ve done this I have not had one issue with my projector.

It wasn&#226;€&#x2122;&#xfe0f;t really an issue on SDR material but much more noticeable on HDR material.
JVC Canada contacted me and asked me to send them a video. In the meantime, I just turned DI off. Still a great projector with it off.
I also dealt with JVC in Mississauga and they were excellent to deal with. They ended up replacing my projector.

Are you experiencing the DI issues with SDR or HDR material?
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post #12075 of 13600 Old 08-20-2019, 09:58 AM
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I also dealt with JVC in Mississauga and they were excellent to deal with. They ended up replacing my projector.

Are you experiencing the DI issues with SDR or HDR material?

I've seen the same DI clicking on other JVC projectors. Even sent one in for repair, but it came back the same. JVC replaced it, new one developed the same problem. Sometimes it's fine, other times not. Sometimes fine for 30 minutes, other times it's problematic right from turn on. I've just come to assume it is what it is.
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post #12076 of 13600 Old 08-20-2019, 10:02 AM
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Can anyone help me understand the eshift graphics mode settings? I can't find a good explanation of what 2K vs 4K actually does and what should be used when. The manual stated use 4K when using content mastered in 4K. However, it never autodetects the incoming signal as 4K unless its 4k60, which think the manual states as well. Up close, looking at Alita, 2K seems to have more give the image more contrast between light and dark areas.

What are you guys using for that setting and do you change it per content?
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post #12077 of 13600 Old 08-20-2019, 10:02 AM
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Originally Posted by coxy2416 View Post
I also dealt with JVC in Mississauga and they were excellent to deal with. They ended up replacing my projector.

Are you experiencing the DI issues with SDR or HDR material?

I've seen the same DI clicking on other JVC projectors. Even sent one in for repair, but it came back the same. JVC replaced it, new one developed the same problem. Sometimes it's fine, other times not. Sometimes fine for 30 minutes, other times it's problematic right from turn on. I've just come to assume it is what it is.
My experience has been similar. That why I turn off the DI, forget about it and enjoy the show!
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post #12078 of 13600 Old 08-20-2019, 07:48 PM
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While i'm waiting for a CMS009 extension column, i mounted the JVC X7900 in a shelf so i can try it.
As i'm not going to perform a full calibration for now, i've selected the THX mode, and performed a basic calibration with HD709 basic patterns (Black/white level, sharpness).

The JVC is paired with a 2:35:1 103" Dalite HD Progressive HD 0.9, in an optimized room with a back velvet tent.
I'm temporarily using a Ziddo X8 as my HTPC is out for 2 weeks.

I've had 3 DLP's in the past (Mits HC3100, Optoma 82 and 87), and went with the JVC as i wanted to have the JVC black levels.
Unfortunately, i'm a bit disappointed ... Although the clarity on Dark Scenes is greater than on the DLP's, the black isn't really black .... i was expecting that on dark scenes, the black would be almost black, and the dynamic iris would provide a near fade to black, but even on Auto 1, it doesn't happen.

I then selected a HD709 0% Dark full window, expecting to "see" a fade to black, and "seeing" all the room disappear (like when the projector is OFF) but even on Auto 1 (manual iris at -8), i could still see the "grey" screen, and the light emitted by the JVC was enough to discern the surroundings around the screen.

Configuration was:
- THX Mode
- Manual Iris at -8, on Auto 2
- Low latency On, the rest OFF
- eshift ON
- Ziddo is configured to use a Limited range (16-235), as well as the JVC.

Were my expectations too high, or could this be some misconfiguration?
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post #12079 of 13600 Old 08-21-2019, 07:58 AM
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While i'm waiting for a CMS009 extension column, i mounted the JVC X7900 in a shelf so i can try it.

As i'm not going to perform a full calibration for now, i've selected the THX mode, and performed a basic calibration with HD709 basic patterns (Black/white level, sharpness).



The JVC is paired with a 2:35:1 103" Dalite HD Progressive HD 0.9, in an optimized room with a back velvet tent.

I'm temporarily using a Ziddo X8 as my HTPC is out for 2 weeks.



I've had 3 DLP's in the past (Mits HC3100, Optoma 82 and 87), and went with the JVC as i wanted to have the JVC black levels.

Unfortunately, i'm a bit disappointed ... Although the clarity on Dark Scenes is greater than on the DLP's, the black isn't really black .... i was expecting that on dark scenes, the black would be almost black, and the dynamic iris would provide a near fade to black, but even on Auto 1, it doesn't happen.



I then selected a HD709 0% Dark full window, expecting to "see" a fade to black, and "seeing" all the room disappear (like when the projector is OFF) but even on Auto 1 (manual iris at -8), i could still see the "grey" screen, and the light emitted by the JVC was enough to discern the surroundings around the screen.



Configuration was:

- THX Mode

- Manual Iris at -8, on Auto 2

- Low latency On, the rest OFF

- eshift ON

- Ziddo is configured to use a Limited range (16-235), as well as the JVC.



Were my expectations too high, or could this be some misconfiguration?
If you have the means to measure the black level you would find (if your x7900 behaves the same as mine) that the DI doesn't fully close down until your manual iris is much more closed than - 8. I don't have my results in front of me, but I think the max DI closure is probably about twice as dark as that at - 8. However you will have not much light at all.

JVC have done this to reduce pumping (and it probably needs to be more still) but it does mean that as far as I can tell the dynamic contrast specs are likely a complete fiction.

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post #12080 of 13600 Old 08-21-2019, 08:09 AM
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If you have the means to measure the black level you would find (if your x7900 behaves the same as mine) that the DI doesn't fully close down until your manual iris is much more closed than - 8.
How do you measure the effect of the dynamic iris separate from the manual iris?
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post #12081 of 13600 Old 08-21-2019, 08:32 AM
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How do you measure the effect of the dynamic iris separate from the manual iris?
I did it a while back for my X7900, there is a table floating around here somewhere.
With some kind of light meter (I used my discus colorimeter with diffuser down on a tripod facing lens as it has quite wide dynamic range) you simply step through each of the manual iris steps measurping black and black white, then enable DI and display white then black (making sure you see the lens iris close down under control of the DI logic) and take the black measure then.
I mapped every step on my X7900 and if I recall up to - 9 they all close to the same step position. The fully closed DI position then gets progressively smaller until -14. At - 14 it is about twice as dark as at - 9.

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Dug out the old info; these were the DI step results for my X7900:
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post #12083 of 13600 Old 08-21-2019, 10:17 AM
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Dug out the old info; these were the DI step results for my X7900:
Thanks.

Looking at two iris settings -7/-15 as examples:
- the Auto2 black is .0051/.0027
- the Manual black is .0285/.0051

My previous question was how to distinguish the contributions from the manual iris from the auto iris, i.e., given that the manual iris also reduces the black level, how do you know that .0051 vs .0027 level is due to the DI not fully closing down at -7?
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post #12084 of 13600 Old 08-21-2019, 10:35 AM
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Thanks.

Looking at two iris settings -7/-15 as examples:
- the Auto2 black is .0051/.0027
- the Manual black is .0285/.0051

My previous question was how to distinguish the contributions from the manual iris from the auto iris, i.e., given that the manual iris also reduces the black level, how do you know that .0051 vs .0027 level is due to the DI not fully closing down at -7?
I'm not sure I fully get your point; the manual iris and the auto iris are the same mechanical iris located at the back of the lens (with the additional lamp iris also getting put in a position based on the manual setting).
When you enable the dynamic auto iris functionality if you watch the lens iris mechanism (which is visible from the outside of the product) you can see it doesn't move if you enable it with a white pattern being displayed. Thus when you make the pattern black (triggering the auto iris algorithm to close the lens iris) you know that the additional darkening achieved is solely due to the influence of the auto iris algorithm on the lens iris mechanism.

Apologies if I've not got the gist of some subtlety you're trying to delve into here, please expand if I'm missing the point.
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post #12085 of 13600 Old 08-22-2019, 11:49 AM
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Thanks.



Looking at two iris settings -7/-15 as examples:

- the Auto2 black is .0051/.0027

- the Manual black is .0285/.0051



My previous question was how to distinguish the contributions from the manual iris from the auto iris, i.e., given that the manual iris also reduces the black level, how do you know that .0051 vs .0027 level is due to the DI not fully closing down at -7?
@Dominic Chan - I think I get what you are thinking now and you're right I believe that the results themselves don't point to it exclusively being caused by the lens iris under control of the DI algorithm, as the lamp iris is also in a different place and that interaction is hard to explore. My recollection at the time was that the lens iris could be observed in the different final positions with the naked eye, but I'll check again. Of course even the lens iris being in a different final position doesn't attribute all the black level improvement to it - there may be interaction between the lens and lamp irises that I don't understand.

There is actually (at least on my x7900) a hack you can do to get the lamp iris into a different position than it should be in - so for example you could test with the lamp iris at -7 position with the DI active and with the lens iris in the - 15 start position. That would allow observation of the proportion of the black improvement due to a changed DI end position and the proportion due to the difference in lamp iris position. It is an interesting test so if I get a chance at the weekend I will do it.

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post #12086 of 13600 Old 08-23-2019, 01:07 PM
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Can anyone help me understand the eshift graphics mode settings? I can't find a good explanation of what 2K vs 4K actually does and what should be used when. The manual stated use 4K when using content mastered in 4K. However, it never autodetects the incoming signal as 4K unless its 4k60, which think the manual states as well. Up close, looking at Alita, 2K seems to have more give the image more contrast between light and dark areas....almost like a darbee or clear black effect.

What are you guys using for that setting and do you change it per content?

Anyone have input?
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post #12087 of 13600 Old 08-23-2019, 01:36 PM
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Originally Posted by Cleveland Plasma View Post
So you are saying it was not the cables then? Did you end up taking that expensive cable back and getting a different one?
It IS the cables, nothing wrong with projector or source. I also got a shorter fiber optic HDMI (20 feet this time from Ruipro) and also got a stable image. I also got another longer cable, even MORE expensive, the cherry cola from Audioquest at 33 feet, which also works flawlessly. Also, as much as I say this, after comparing the Ruipro cable vs the Audioquest cinnamon and cherry cola, and there IS actually a pretty big difference in the contrast of the picture, that DOES make quite a drastic improvement in the PQ. If you're into PC games, it's the difference between levels of ambient occlusion setting, which makes the picture almost a bit more "3D" like due to the darker shadows and more vibrant contrast. As a former firm non-believer in expensive HDMI, I have to say that the more expensive cables DO make a difference. But AQ cables are still overpriced. I'm going to find a 33 feet AQ Cinnamon HDMI from ebay hopefully for under $200, which compared to the $150 Ruipro 33 feet is worth the increment in cost for the improvement in PQ.

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post #12088 of 13600 Old 08-23-2019, 07:25 PM
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Quote:
Originally Posted by Solarium View Post
...As a former firm non-believer in expensive HDMI, I have to say that the more expensive cables DO make a difference...
I was in the same boat.. tried AQ cinnamon cables from my
HTPC to the AVR and heard and saw a major difference. The sound stage is now much more 3D and easier to listen to long term. I tested chocolate and above AQ cables but found the cinnamon to be the sweet spot for me. Others were too bright for audio and a lot more expensive. The audio overall was helped more than the video, but I have an extremely high resolving audio system (JBL horns and subs, Infinity mix). Highly recommend AQ products, but should test for best match to your system .
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post #12089 of 13600 Old 08-24-2019, 07:51 AM
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post #12090 of 13600 Old 08-24-2019, 07:55 AM
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Can anyone with a JVC X7900 and using madVR suggest the best settings for REC709 and BT2020?
I'm using the JVC in a full velvet tent, with a 2:35:1 Dalite HD 0.9 screen.

My quick settings so far have been,
for REC 709:
- Low Latency ON, all rest OFF
- eshift ON
- Enhance: 2, all others 0
- Clear Black: Low
- Graphic mode: 4K
- THX
- Clear Black: Low
- Low Lamp

for REC BT2020:
- Low Latency ON, all rest OFF
- eshift ON
- Enhance: 2, all others 0
- Clear Black: Low
- Graphic mode: 4K
- User 1
- Gamma: Custom 1, Correction Value: 2.2
- Color Profile: BT2020
- Low Lamp

Thank you!
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