I've just received my K451s, bought new from eBay (I know I know, but the seller has stellar feedback so I decided to take the risk and they were only a tenner less than the next cheapest retailer -- possible false economy though!).
Anyway, on first listen I'm very disappointed -- the treble sounds incredibly muffled, especially compared with my earphones (RHA MA-350s) which sound crystal clear in the highs, to my ear. I'm wondering if perhaps they need burn in first, or perhaps I've got too used to the bright treble of the RHAs? Maybe this is what a more neutral set sound like... but I'd have expected a set of 'phones that retails at £130 to sound demonstrably better than ones which are a hundred quid cheaper!
I've read that the previous model (K450) had a lot of issues with fakes, but I don't know if the same goes for the K451s. The packaging all looks legitimate and the phones themselves feel solid, as do the accessories (the hard case is especially nice).
I've emailed the serial number to AKG to ask them to check whether it's in their database, which will obviously be definitive.
In the meantime, I wonder if anyone else has had experience with the K451s or has any tips?
Edited by melat0nin - 10/31/12 at 2:06pm