Oh dear. Only a couple of weeks ago I didn't know of head-fi or the K518DJs and having read this thread in its entirety now look what's happened - I've ended up with a new pair of headphones! Is this just the start? Well, as I'm also now interested in getting a PA2V2 amp it might just well be! (My rockbox'd iriver H320 doesn't do all that bad a job at driving the headphones just that they're definitely better though my Audigy LiveDrive which has a good headphone amp in it.)
Anyway, I digress. The K518DJs are replacing the well used and now falling apart (don't drop laptops on headphones) pair of Sony MDR-V300s I had been using up until now. Out the box the sound of the K518DJs sounded sort of similar to how I used to listen to the V300's on my iriver - with the bass +10dB (+12dB on noisy diesel trains or buses or while walking in busy streets and the like) and the treble +4dB. So with no EQ the K518DJs are already sounding more to my taste. The V300's are quite muddy sounding anyway, hence the need to boost the treble a fair bit, so I didn't find the K518DJs all that bad sounding out the box as some might have. Still, I wasn't that happy with the sound so following the advice I left them to burn in, periodically checking on them. I'm now just past 20 hours and wow! When people say these things respond well to burning in they're not kidding! Even now I'm noticing a huge improvement - the highs have come out quite a lot and the mids are getting there (although I'm aware the mids aren't the strongest point on these cans). I did try the foam pads out just there but wasn't sure if I liked it at this time. The highs certainly did improve but possibly were a little too bright. I think I'll wait till 40 hours or so then experiment with them in or out and in different environments too, not just my quiet flat.
It's probably also worth me mentioning the comfort as people seem to have varying opinions on this. For me, they're not too small nor do they grip too hard, they're just as I like it. In fact I have my head band at only the No. 4 setting. These are the first headphones I've had where I've not had them at the lowest setting. I think I've probably got a narrower than average head maybe?
Here's some pictures of my K518DJs and comparison with the connector/cable of my V300s:
AKG K518DJ Gallery
I notice that the connector on my K518DJs seems to differ from what I've seen earlier in this thread. Mine's equipped with this silly little thin thing which makes the supplied screw on adaptor pointless and I can't see it lasting very long. The cable is also rather too thin for my liking - although not too long - my V300s have an even longer cable, but it's thicker. This brings me on to a question for those who know more than me about cable: Is it worth swapping the cable from my V300s to the K518DJs? I've no idea if the V300 cable is better SQ wise. What I do know is it's thicker and uses rubber-like insulation which doesn't get tangled in knots and has no "memory", so it's a clear winner in that respect.

(click to enlarge)
Here's a picture comparing the connectors.

(click to enlarge)
And here's one showing the wires in the V300 cable.
See gallery for more pictures.
So, for those in the know about SQ and cable, what's your thoughts on swapping over the V300 cable? If it's not going to do anything or even make it worse then I'll probably just leave the stock one on for now until it inevitably breaks or I get fed up with it tangling up.
FYI I bought these from the very nice people over at
Planet Gizmo for £34.99 + £3.99 delivery.
Edit: I'm now 32 hours into burn in and I have some more observations... I'm now listening to them with the pads out and the head band at No. 2, and yes it does bring out the high end, but the upper mid range is still lacking. Now this'll sound strange to a lot of people but at the moment I can get them sounding the nicest (to me) if I push the headphones slightly higher up my head - ie I could do with the head band going even
smaller! There's still a full seal and all the bass when I do this. There doesn't seem to be nulls in the frequency range then. If I don't do that I find they sound better if I have them loud (too loud for my liking really). I think perhaps a combination of burning in more, EQing where possible, possible cable replacement and just plain getting used to them is needed.
Cheers,
Rob