[Bones13]

Finding a used 580 would be the best entre' in my opinion. First off, I am not sure you can still find these new. If you are enchanted by the sound right off, you are good to go. Upgrading the grills, and cables would be a way to further tune to your taste.

I have both the 580 and 650, but not the 600 (I can't stand that pebbly color). The 650 is for sure a bit darker, but does have a better range than the 580. Both are comfortable to wear, and do well in long listening periods.

BTW, I also own balanced HD800, and W5000, which are both superb upgrades in both lines. Even at this point, the Senn is the one I can listen to without fatigue.

 

[dweaver]

I have a line on an HD600 from a fellow head-fi'er for only a bit more than the HD580's I have been looking at so I'm going that route as soon as we figure out if the shipping won't be too prohibitive. I find the coloring a bit weird but I think I can grow to like it LOL. I like the idea of non-fatiguing which is what I'm finding with the AT CKS70, they are comfortable and all the high treble is toned down enough I can wear them all day without fatigue. So if these give me that, I will probably be set (like that will last long LOL).

 

[Il Mostro]

New 580's can still be found, but are only about $50.00 less than the better deals on new 600's. Considering the differences in grills and cables (and re-sale value), better to go with the 600's if buying new IMO. For whatever reason, most of the used 580's I've come across lately have been pretty beat. I concur that the 650 is a very different animal and downright murky sounding in comparison.

 

[Gberg]

All this sound of 'murky' 'dark' and 'veiled' of the HD650 is scaring me off upgrading my 580s to them one day.
Maybe you guys just aren't amping them properly?

 

[dweaver]

Well I'm in all the way now

. I finalized the purchase and paid for the HD600's they should be here next week I hope. Looking forward to testing these babies out.

 

[Palpatine]

Well...many say HD600...but I sold mine for hte HD650 after I auditioned them, and never looked back. Clarity is awesome.