[DivineCurrent]

So, I got my ODAC+O2 combo the other day, and I was able to test various headphones with it: DT 880, K240, HD 580, and K612. The Senn HD 580s sound best to me with the combo, since the odac+o2 adds a bit more treble detail than other sources I have used. 
 
I want to stay within the price range of $300-400 and preferably not go any higher than $425. I love the sound signature of both the AKG K240 and Sennheiser HD 580. I'm thinking the HD 600 is perfect for me as it may be a slight improvement over the 580, but I also want to consider the AKG K712. I was able to give the K712 a listen a while ago, unfortunately I was using a crappy computer sound card as my source (before I knew I actually need an AMP to power headphones...) and didn't really give it a chance. Both are now priced pretty much the same at around $375 on amazon, and I want to pull the trigger on one of them. The K712s definitely have more bass which is always welcomed for me, but I don't remember how the mids and treble sounded. To me, the HD 580s mids and treble are right where they should be, maybe they could use a TAD more treble, but with the odac+o2 this is fixed a little. 
 
Who has listened to both, and which do you prefer with a neutral amp like the O2? I'm just asking for opinions, not asking to make decisions for me.

 

[PurpleAngel]

  So, I got my ODAC+O2 combo the other day, and I was able to test various headphones with it: DT 880, K240, HD 580, and K612. The Senn HD 580s sound best to me with the combo, since the odac+o2 adds a bit more treble detail than other sources I have used. 
 
I want to stay within the price range of $300-400 and preferably not go any higher than $425. I love the sound signature of both the AKG K240 and Sennheiser HD 580. I'm thinking the HD 600 is perfect for me as it may be a slight improvement over the 580, but I also want to consider the AKG K712. I was able to give the K712 a listen a while ago, unfortunately I was using a crappy computer sound card as my source (before I knew I actually need an AMP to power headphones...) and didn't really give it a chance. Both are now priced pretty much the same at around $375 on amazon, and I want to pull the trigger on one of them. The K712s definitely have more bass which is always welcomed for me, but I don't remember how the mids and treble sounded. To me, the HD 580s mids and treble are right where they should be, maybe they could use a TAD more treble, but with the odac+o2 this is fixed a little. 
 
Who has listened to both, and which do you prefer with a neutral amp like the O2? I'm just asking for opinions, not asking to make decisions for me.

 
I'm assuming the AKG K612 Pro was not something you would have considered?

 

[DivineCurrent]

   
I'm assuming the AKG K612 Pro was not something you would have considered?

Yeah, I listened to it, did not like it really. Not enough bass and too much upper mids, made everything sound unnatural to me.

 

[DivineCurrent]

Also, I forgot to mention that I was interested in the Beyerdynamic T1 for a while, but the cheapest I can find that is $750, kind of out of my budget, but perhaps I can sell some of my other headphones. Would it be worth the extra $300 for a T1?

 

[DivineCurrent]

Alright, UPDATE after a few months...
I listened to the Beyerdynamic T1 with multiple sources, but I actually prefer the sound of the DT 880 over it for some reason... the T1 had a bit too hot treble for my tastes, and not really enough low end impact. So, the T1 is a no go for me.
I am a huge fan of the AKG K240 Monitor sound signature. These are different from the popular Studio version, and they are a lot better IMO.
I'm thinking since I like the K240s so much, I should at least try the K712s before I try the HD 600s. Who has owned both the HD 600 and AKG K712, can you guys comment on the differences or similarities (and which amp you use?)