Nice job! = D

Great review, thanks for sharing.

Nice comparison. Thanks!

Yeah I agree, the genre that AKG consistently does well IMO is Classical/Orchestral. Very thorough, great read.

amazing review! now I loving my K7xx even more XD

Hey, nice. But try to upgrade your setup with a usb transport (like M2tech HiFace Evo 2 or Casea Aquila) and you will get a better treble

Thank you for sharing your very good review!  One small correction (or maybe just clarification). You write that the "every K7xx is serialized, unlike the DT880."  The DT880 has a serial number number on one of the top flaps of the box, right below the barcode. I entered that number when I successfully registered mine on the beyerdynamic website.  Of course, it would be better if the number were on the headphones (as it is for the DT250-250, to use another beyerdynamics as an example).

@MarcoGV I meant to say the headphone is not serialized.  I will clarify, thanks for pointing that out.

@Rhamnetin How similar are the k712's to the k7xx? Thanks for the review! Very helpful 

@Vapin Wabbit I've never heard the K712, but they are known to be very similar.  See this thread:
 
http://www.head-fi.org/t/752994/my-akg-comparison-k7xx-k712-65th-annies-and-the-rest-to-stop-this-confusion

Love the aesthetics of the AKG 7xx.

So in about a week I'll be putting @TiborM's theory to the test, using a Gustard U12 and Audioquest Cinnamon Coax cable.  Will be interesting to see if it evens out the treble. 

Hopefuly it will help.
Also I find my K7XX quite dry sounding, but I have ordered new cable for them from Forza Audioworks, I will see if that will help. It has helped my Aedle VK-1 with it´s dry sound, so I am hoping.
And I have added some bass to the AKG´s +2db from 55hz to 300hz. VERY NICE! Mid range and trebble remain unaffected and the bass is there now :