Friday, July 25, 2014

XBR-65X950B vs XBR-65X900B; XBR-85X950B vs XBR-79X900B (Sony X950B vs X900B)

Being the flagship 4K TV from Sony this year, the X950B exclusively features full array backlight with local dimming as part of the X-tended Dynamic Range PRO technology. Not only it's able to precisely dim the backlight for dark areas of a scene, thus achieving deep black levels, but, at the same time, it can allow up to three times the electric current to be applied to the LEDs corresponding to bright areas if necessary. The combination of improvements in the reproduction of luminance, gradation and black level lead to higher dynamic range, and ultimately to a better image quality.

The X900B is equipped with the X-tended Dynamic Range technology, which boasts up to two times the brightness of a standard LED HDTV. Due to the position of the LEDs, which in case of the X900B are side-mounted, the form of local dimming that's employed here is slightly less effective in comparison to the one of the X950B, which, as mentioned previously, has a full-array backlight. While the X950B has the ability to allow up to three times the electric current to be applied to the LEDs behind bright areas, the X900B is capped to up to two times. Also considering the dimming system on the latter is less precise, the dynamic range of the X900B is more limited in comparison to the step-up series.

The X950B has the Deep Black panel, which is in fact a low reflection layer to the screen coating, aimed at reducing diffusion of the backlight in addition to minimizing the on-screen reflections caused from external light sources. This makes the flagship series better suited for bright environments since the image contrast is preserved, and the colors remain vibrant.

The damperless design of the Magnetic Fluid speakers on the X900B helps reduce distortion. The fact the speakers are front-facing further contributes to clear sound. The total audio power output is 65 Watts and the speakers configuration is 2.2. On the other hand, the X950B has a 2.1 channel speaker system and the total audio power output of the 65-Inch class device is 30 Watts and the 85-Inch class has 40 Watts of audio output power. The latter has two subwoofers, while the former has only one, hence the difference. The speakers on the X950B series are down-firing, so they cannot quite match the X900B in terms of clear sound. Additionally, the bass is less powerful on the X950B, especially when it comes to the 65-inch class model.

Both series can accept video signal up to 3840x2160/60p, albeit 4:2:0 8-bit. They also incorporate decoder for the HEVC standard, meaning they can playback 4K/60p contents from various streaming services. The 4K X-Reality PRO processing engine is present in both of them, so the upscaling technique used is the same. Either one has a native panel refresh rate of 120Hz, in addition to Motionflow XR 960, which makes them equally suited for fast-motion content, such as sports and action movies.

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