007 mkII's are super recessed in 2-10khz range(about -5db) compared to what harman curve suggests. Besides the harman curve, as I said before, headphones need certain amount of boost in their midrange response to reach to *neutrality,* *flatness.* 007's midrange response isn't boosted enough. (007's have recessed mids even relative to DF neutrality response curve) They have quite laid back, quite smooth presentation. Some like smooth, laid back presentation with laid back mids(LCD4 also shares similar traits with 007). Some don't.
I am mostly skeptical about the audible differences between amps. However, when I compared 727 to Carbon, I realized that 007's treble out of Carbon was much more *sparkly* compared to 727. Without sparkly, bite-y treble, 007's do only sound dark & boring.(to me at least). 007's excited 8-12khz response kind of balances out the recessed mids for me. If the dac/amp doesn't let 007 to deliver that, they may sound boring. Even with Carbon you might not like them though. An amp can't change the tuning of headphones, a better amp can only clear out the unwanted artifacts from the sound without adding new.
In short, there is nothing exciting going on in 007's presentation if you are looking for excitement, or wow factor... I like the way they sound but they are not for everyone.
I am mostly skeptical about the audible differences between amps. However, when I compared 727 to Carbon, I realized that 007's treble out of Carbon was much more *sparkly* compared to 727. Without sparkly, bite-y treble, 007's do only sound dark & boring.(to me at least). 007's excited 8-12khz response kind of balances out the recessed mids for me. If the dac/amp doesn't let 007 to deliver that, they may sound boring. Even with Carbon you might not like them though. An amp can't change the tuning of headphones, a better amp can only clear out the unwanted artifacts from the sound without adding new.
In short, there is nothing exciting going on in 007's presentation if you are looking for excitement, or wow factor... I like the way they sound but they are not for everyone.