Ultra HD is an expensive hobby. However, after a year or so of extortionate five-figure sums being bandied around, the new 4K format is finally beginning to slip from the bracket marked 'footballer' to one with a slightly less salubrious 'AV enthusiast' tag.At the vanguard is this 55-incher, which has received an almost immediate price drop from £4,000 to £3,299, thanks to Toshiba's decision to sell its own 58-inch attempt at 4K for a mere £2,999.Ultra HD and 4K TV: Everything you need to knowWith a screen that measures 55-inches in the diagonal, the KD-55X9005A is just about big enough - in our humble opinion - to make the best of Ultra HD sources (not that there are many of them). However, the KD-55X9005A has got something that rival Ultra HD TVs don't have; amazing speakers.