I've owned a 5i and 5se. The 5se is a far superior preamp. Better detail, imaging, clarity and bass. It's not quite as "cold" as the 50se, retaining some midrange warmth of the 5i. The economics of upgrading BAT products doesn't make a lot of sense though. I was lucky to sell my 5i and buy a 5se for about 1/3 the cost of a factory-upgrade.
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