Toshiba 55M450SU: 55-inch QLED Fire TV
The Toshiba 55M450SU is a 55-inch class 4K smart TV that combines QLED picture technology with Fire TV. It has HDMI connections and built-in wireless networking. REGZA AI Engine ZR Gen4 handles picture processing. REGZA Power Audio is part of the sound system. Its screen and connections suit a mix of films, streamed shows, sports and games, with settings that let you adapt the picture to the source and room.
4K picture and backlight control
The screen has a 3840 x 2160 resolution. REGZA QLED Color uses quantum dot technology with a direct LED backlight. This gives the TV separate tools for color and brightness: quantum dots are part of the color system, while the backlight illuminates the LCD panel. A good 4K source can reveal fine texture in faces, clothing and scenery. Lower-resolution programs depend on the quality of the original recording and the TV's processing; upscaling does not replace detail that was never captured.
HDR and film settings
HDR support includes Dolby Vision. With a compatible program, these formats carry information for highlights, shadows and color beyond a standard SDR signal. Choose the available picture settings to suit the type of program you watch. Select the HDR version in your streaming service or player when available. The result also depends on the source, picture settings and light in the room. A bright window facing the screen can still affect the image, so consider seating and light placement along with the TV's picture controls.
Refresh rate and connected games
The 55M450SU has picture settings for connected game sources. The native panel refresh rate is 60Hz. These features apply to compatible sources and signals; the console or PC, cable and selected HDMI settings must work together. A motion-processing rating is not the same as native refresh rate. For play, check the source's resolution and frame rate before selecting its output mode. For films, try the film picture mode before adding motion smoothing, since the preferred look can differ between cinema and live sports.
Fire TV and streaming
Fire TV brings supported apps together, with Alexa voice control for compatible searches and commands. The built-in interface lets you browse supported apps without an extra streaming box. Internet access, account setup and any required service subscriptions are needed; app and program availability can vary by region and change over time. An external streaming player can also connect through HDMI if you prefer its interface. Use a stable home network for high-resolution streams, since connection quality can affect loading time and the detail delivered by an online service.
Connections for your equipment
HDMI inputs provide connections for compatible players, consoles and other video sources. There are four HDMI inputs and two USB ports. Wi-Fi 5 and Bluetooth 5.3 provide wireless connections. Check which input supports the signal you want to use before connecting a high-frame-rate game source. Keep a sound system's audio formats in mind when choosing its connection. Leaving space to reach the sockets also makes it easier to change a cable or add another device after the TV is in place.
Sound and everyday controls
The two speakers have a combined rated output of 20W. Dolby Atmos support is included for compatible content, with the listening result depending on the program and speaker setup. The remote provides the main controls for menus, sources and volume. The TV's own speakers provide a complete basic setup for daily use, while a separate sound system can suit viewers who want more output or a different speaker layout. Voice and smart features may require an account, internet access and supported services; use the remote's standard buttons whenever that is more convenient.
Dimensions, weight and room fit
Without the stand, this model measures 48.5 x 28.1 x 2.8 inches in width, height and depth and weighs 20.5 lb. With the stand, it measures 48.5 x 29.8 x 10.7 inches and weighs 20.9 lb. The wall-mount hole pattern is 200 x 400 mm. These are TV measurements, not the shipping carton. Check the furniture width and depth, leave room for cables and follow the mounting instructions. The 55-inch class label refers to the screen diagonal rather than the width of the cabinet.
Viewing position and finishing your setup
Viewing angle and room light can affect the image from a side seat. Sit near the center when assessing picture settings, then check how the image looks from other seats. Allow space around the cabinet for ventilation and place the screen at a comfortable height for your main seat. Once connected, compare a familiar film, a live program and a game to choose the settings that suit each source and the light in your room.
