We used the following calibration settings to review the 55-inch Amazon Fire TV 4-Series, and we expect them to be valid for the 43-inch (4K32N400A), and 50-inch (4K50N400A) models as well.
These settings are meant to be used as a starting point - many of them will need to be adjusted based on your viewing conditions and personal preferences. We disable all extra processing on the TV, as we're aiming for the most natural, accurate image possible. The backlight and gamma settings are what we used for calibration in a completely dark room, you'll need to adjust these settings depending on your viewing conditions.
For SDR content, we recommend choosing the 'Movie' Picture Mode, as it is the most accurate one out of the box, and allows for the most customization. From the Advanced Settings menu, we left Contrast at '50', Brightness at '50', Color Saturation at '45', Tint at '50', and Gamma at '0'. We also set the Color Temperature to 'Warm' and left Sharpness at '0', which is the no-sharpness setting.
You should adjust the Backlight to your viewing conditions. Note that this setting does not affect picture quality.
We disabled Dynamic Contrast, MPEG NR, and Noise Reduction, but the last two can be useful if you see a lot of noise or banding in lower-quality content. We don't recommend leaving these settings enabled when watching high-quality content, like Blu-rays, as it can cause a loss of fine details.
HDR is automatically enabled for the native apps. When you start playing HDR content, a small HDR icon appears in the picture settings menu. Once you start playing HDR content, some of the settings change automatically. We recommend choosing the 'Movie' Picture Mode and leaving the other settings to their defaults in HDR.
For HDR to work from external devices, the HDMI Input Mode option usually has to be set to 'Mode 2 (2.0)' for the input you are using. Older devices may have compatibility issues if this option is left enabled, so it is recommended to only enable this setting for devices that require it.
Although we disable most motion enhancing functions for most of our tests, you should adjust these to whatever looks best for you. Some settings may need to be adjusted depending on the specific content you are watching.
Although we usually leave these settings disabled during most of our testing, you should adjust the settings in the Advanced Settings menu to your liking, as different people prefer different levels of motion interpolation. If you want to enable motion interpolation, adjust the Action Smoothing setting until you find the level of soap opera effect you like. Note that this setting is disabled if Natural Cinema is enabled.
The Amazon Fire TV 4-Series can remove judder from all sources. To enable the judder-removal feature, enable the Natural Cinema setting from the Advanced Settings menu.
Unfortunately, the Amazon Fire TV 4-Series doesn't have an optional backlight strobing feature, commonly known as black frame insertion.
From the base SDR and HDR settings, very few changes are required for the best gaming experience. When you start gaming, it is best to switch to the 'Game' Picture mode to get the lowest input lag and use the recommended settings for SDR or HDR. This TV supports auto low latency mode, though, so it should switch automatically when it detects that you're playing a game.
For HDR gaming, it is important to make sure that HDMI Input Mode is set to 'Mode 2 (2.0)' for the input you are using.
For PC Gaming, normally we would recommend making sure you are using the 'PC' Picture Mode and that HDMI Input Mode is set to 'Mode 2 (2.0)' for the input you are using. Unfortunately, PC mode appears to do nothing on this TV, as it can't display chroma 4:4:4 properly and only has low input lag in Game mode.
Unfortunately, this TV doesn't support a variable refresh rate.
The Amazon Fire TV 4-Series supports eARC. For it to work, set ARC Mode to 'eARC' with the Digital Audio Format to either 'Passthrough' or 'Auto'. These settings are found in the Display & Sounds section.
The following are the results of the white balance and colorspace calibration on our unit. They are provided for reference, and should not be copied, as the calibration values vary per individual unit even for the same model and same size as the TV we reviewed due to manufacturing tolerances. If you want to try them, you will need to enter all values shown, as all of them are active at the same time. If you end up with worse picture quality, simply reset them to the default values.