As a data point, I'm following up on a replacement HT5550 I received yesterday.
My original unit (March 2019 MFG date) developed a stuck micromirror. The new unit has a August 2019 MFG date.
1. Much quieter dynamic Iris. This is significantly less noticable than my original unit. I can barely hear it. Note that my original unit had to be sent back for updates to the Iris and firmware back in the summer.
2. Less "pumping" due to DI. I still have more testing to do, specifically with how subtitles look, but in the 2 hours I watched last night, I couldn't detect brightness changing due to the Iris being engaged. It was pretty evident on the old model.
3. Wayyyy quieter switching between SDR and HDR. My original unit made a loud noise when switching between those modes or enabling the color filter.
4. Better color reproduction? I'm basing this off of the included calibration report as well. The one on the left is my original unit, the right is the new one. It might be hard to tell, but the report for the new projector shows better coverage of both rec 709 and DCI-P3.
On the negative side, the first time I turned on the new unit, half the screen was blank. Restarting the unit fixed it, and it hasn't returned since.
In addition, there is a bright spot that appears far outside of the expected image range. I thought it was something on my wall (roughly 1 foot above the top left corner), but apparently it's the projector. Going to try and troubleshoot this one further.
I'm going to keep the new unit for now, depending on if I can isolate/mitigate the spot, but the performance and noise are much improved.
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