The phrase ‘pushing the envelope’ has nothing to do with post, or stationery for that matter. It originally referred to the ‘flight envelope’ – the upper boundaries at which it is safe to fly – speed, engine power, manoeuvrability, and so on.
But having since come to mean going beyond your limits, it’s a particularly apt phrase to describe Sony’s latest Blu-ray player the UBP-X1000ES.
At £725, it’s a premium product by anyone’s standards, but Sony is certainly pushing the envelope to make sure this player gives you the best performance possible.
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https://www.whathifi.com/sony/ubp-x1000es/review