Equally ahead, I am a follower of AKG headphones and have also an AKG 240 Monitor from the 80 in use. This device is simply a madness headphone and as I now saw the Presonus HD7, I noticed immediately that he is identical with the AKG. Here, then, seems to some to be linked. However, the HD7 has much less impedance, is therefore well suited for portable MP3 devices. The comfort is absolutely comparable, so really great with the AKG. The execution as well. From the sound seems to me that the AKG is full, the Presonus brighter and crisper, but may be wrong also, is only subjective perception. The Presonus sounds in my opinion, really very good and is highly recommended. I would be interested but already, what similarities there really is between Presonus and AKG. Could nothing official to find out here.