Have just had my Dax Decade upgraded with to balanced output (with Black Gates throughout) in order to take full advantage of the bridged switching amp that is the Bel Canto Evo4. I was advised that there is a burn-in of 30 hours or more, and certainly when I had the BGs fitted to my single-ended some while back it was at least that, but Alanbeeb and have just been having a listen, and the upgrade's a winner!!! very realistic with all types of music: from Miles Davis, to Borodin Quartet, Mahler, to John Martyn and Dick Gaughan.