Toshiba Regza 46XV648U

Black Level (7.60)

The Toshiba 46XV648U was capable of producing only a decent black level, but not something that’s going to wow the crowd. For an LCD display, it’s average, and it certainly can’t compete with the deep blacks you get from a plasma display. However, you’ll be pleased to know that it outperformed the other TVs in this little comparison pool we’ve put together, so that’s not too shabby, is it? More on how we test black level.

Read Reviews of Comparison Products
Sharp Aquos LC-40LE700UN	Toshiba 46RV525R	Samsung LN46B750

Peak Brightness (8.57)

The Toshiba 46XV648U can produce a wholly sufficient peak brightness score, meaning you’ll have little cause to complain about how bright the whites get. The Samsung LN46B750 outscored the Toshiba in this test, but side-by-side, you probably wouldn’t be disappointed with the Toshiba. More on how we test peak brightness.

Contrast (7.79)

The contrast ratio scores here measure the actual black level-to-peak brightness range that the screen can produce in real life, without playing with the contrast, brightness, and other settings. Frequently, those overinflated contrast ratios that manufacturers tout is a result of tweaking the menu settings, taking a measurement, tweaking some more, taking another measurement, and so forth.

The Toshiba 46XV648U performed well here, thanks to a decent black level performance and a good peak brightness. The Samsung LN46B750 followed close behind. The Sharp and the other Toshiba (a 2009 model) did less well. More on how we test contrast.

Tunnel Contrast (9.07)

The Toshiba 46XV648U showed less than perfect results in the tunnel contrast test, which measures how well a TV can maintain black level as the amount of black on the screen increases and decreases. Ideally, it shouldn’t matter, but the Toshiba showed a tendency to wander, for lack of a better term, with a trend towards getting brighter if the black patch was surrounded by bright white. More on how we test tunnel contrast.

White Falloff (9.94)

Toshiba 46XV648U showed no problem, however, with maintaining peak brightness levels, as evinced by our White Falloff test. Most TVs do not have a problem here either. More on how we test white falloff.

Uniformity (5.88)

The screen uniformity of the Toshiba 46XV648U was okay, but not great. When we examined an all-white screen, we could see some barely discernible areas of darker white. The corners were noticeably darker and yellower. When looking at an all-black screen, brighter patches are clearly visible, and there’s obvious flashlighting in the corners. It’s certainly not a terrible performance, overall, but it’s not perfect. More on how we test white falloff.

Greyscale Gamma (9.40)

The Toshiba 46XV648U showed a very good performance in the greyscale gamma test. The chart below shows how smoothly the TV can transition from shadows to highlights. Any bumps indicate areas where you would likely see some banding. Areas of of the line that are too horizontal indicate where the TV might be missing some detail. Those small, flatter segments in the lower-left side indicate some missing shadow detail. But overall, the performance was strong. The slope of the curve, 2.3, is nearly perfect. More on how we test greyscale gamma.

Other Models in the xxXV648U Series
For more information on other models in this series, check our Series Comparison Page.
Toshiba Regza 40XV648U 40 in.	Toshiba Regza 52XV648U 52 in.