[...] As I said, since then I had 44-45 SRH440 Models, some new, some used. More than half of them were the neutral version, which i really don't like. No Bass, very harsh highs. The rest of them were the bassy ones. Besides of these, I haven't heard other versions. I think, there are only these 2 Versions. I don't believe its because of Burn in . . . because new...old...i burned them all in. The neutral ones stay neutral and the bassy ones stay bassy. Its really a matter of good or bad luck. I even opened them, to compare the serial numbers, because i thought that maybe the numbers can give me a hint why they sound so different. Nothing unusual found. So buy and sell, buy and sell until you have the bassy ones xD Its not hard i mean every second or third one i bought was the bassy version :-/
I start to believe, that they made the neutral versions for the US market and the Bassy Versions for europe? That could be.
Thank you for reporting your experience, especially regarding their serial numbers. Otherwise, I would have wondered if they had more that one factory making it.
I'm pretty sure mine is the sometimes bright version. I'll return it and try something else.