According to RHA's website, they intend to "deliver the most accurate, comfortable and unobtrusive listening experience possible" to the users. And their proprietary Aerophonic™ Design along with hand-crafted drivers indeed represent such commitment.
|RHA's description on their Aerophonic™ Design|
|The official frequency response of MA750|
CON: There's a good amount of channel matching issue below 2 kHz, along with a slightly recessed mid-range.
Manufacturer website: http://www.rha-audio.com