Hi Guillaume,Hi there,
I recently (June 2020) purchased the Optoma Cinemax P1 based on good reviews.
However, in my settings I have a couple of issues and would like to see if you could help me. I opened a ticket with Optoma support but no answer for more than a week now...
I'm fairly technical and I setup my Home Theater myself.
Im on the latest FW version available online US.
Here is my setup:
- Apple TV 4 k
- HDMI 2.0 certified cable (the one from Optoma) to my AVR
- AVR - Denon AVR-X4700H (2020) model came out in June this year!
- 25 FT HDMI 2.0 Certified cable - not an active one, but certified.
- Optoma Cinemax P1 - connected to HDMI 1
Main problem is what looks like a "negotiation" issues. The P1 is fast to show in the HDMI 1 icon (top left) that it's a 2160p @60Hz HDR source but it can take a very very long time to cycle through "snow effect" picture, "connect something" picture, go back to "snow effect", and finally display the Apple TV picture. If I switch sources could be also a similar issue but really unpredictable in performance.
I've asked support from DENON support very responsive and fast and they recommended an EDID emulator (I was not convinced) but I tried 2 models (not the most expansive) and nothing better, actually worst (downgrade to 1080p)... So wanted to have your inputs...
Question 1 - should I set my Apple TV 4K to a more suitable Video output format to the P1? Which one is recommended?
Question 2 - the Denon AVR 4700 is not just pass through and do some video manipulation on 4K/8K sources/outputs. Any recommendation here. I tried pass through but didn't see any improvements.
Question 3 - could it be the long HDMI cable? I did rule it out with testing the same setup with my LG 4K TV and no issue... I was thinking to do more test.
Question 4 - when it finally Locked on HDMI Apple TV (2160p @ 60Hz 4.2.2. HDR) I can watch movies and some times during the movies we go again though a "negotiation" cycle (or what looks like one...) - what can it be and what settings to use?
Question 5 - there is nothing in the manual about the HDMI EQ feature (Auto or +/- 11 values). Does it matter?
Question 6 - would you recommend a 25 FT or 30FT Active HDMI cable brand? I got CAT 6 running and could also setup a optical fiber is we need to. Any recommendations?
Second Problem - HDMI CEC - not clear. My Apple TV remote control ON/OFF the Denon AVR when I switch on or put to sleep but looks like nothing is being sent to the P1 and the P1 doesn't react. I will try my old Panasonic P8000 1080p to see if the CEC goes through the AVR.
Thanks in advance.
Guillaume aka G.
I have the exact problem:
Optoma CinemaX P2
Yamaha RX-V6A (2020 model)
3ft HDMI cable (audioquest vodka) on port 1
when I connect apple tv or 4k bluray player directly to projector, no issue at all, seems like HDMI communication issue between p2 and receiver.