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Thanks v.much, Stephen. For that price, I suppose they come with a comfy armchair and a cup of tea, too...
As it happens, I only want them for the TV - it's the old story, Mrs A's hearing is okay, and wants the TV at a certain volume, while mine is getting dodgy, and I need headphones at a different volume.
I'm going to split the TV output to a) existing speaker system (for Mrs A), and b) a bluetooth transmitter for my headphones, anyway, all I need is to be able to control my volume.
But thanks for the pointer. A lot of my gear is Sony, so I might look deeper into what else they've got.
Allen.