Mine came with FW 1.40 and did the upgrade to 1.50 but no audible difference for me. I am currently listening mid-gain, 10-11 o'clock and it works wonderfully with Stealth. It is impressive how much performance they can sqeeze in such a small device these days.We just got one in, haven't listened yet. I did put it up on the AP 555 and was surprised to see how rolled off the highs were. Unusual... That said there's not much above 15K on most recordings but still it seems a departure from other Topping designs. Planned to give it a listen tonight...
PS: I just noticed it was high gain, not mid.
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